163 solved questions on Some Basic Concepts of Chemistry, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
A solution of two components containing n1 moles of the 1st component and n2 moles of the 2nd component is prepared. M1 and M2 are the molecular weights of component 1 and 2…
View solution →The volume of $0.02 ~\mathrm{M}$ aqueous $\mathrm{HBr}$ required to neutralize $10.0 \mathrm{~mL}$ of $0.01 ~\mathrm{M}$ aqueous $\mathrm{Ba}(\mathrm{OH})_{2}$ is (Assume complete…
View solution →When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mL of 0.02 M solution of K2Cr2O7 was required to get the…
View solution →A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is ________ (Integer answer) (Given : Molar mass in $\mathrm{g}…
View solution →If 5 moles of $\mathrm{BaCl}_{2}$ is mixed with 2 moles of $\mathrm{Na}_{3} \mathrm{PO}_{4}$, the maximum number of moles of $\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}$…
View solution →If a substance '$A$' dissolves in solution of a mixture of '$B$' and '$C$' with their respective number of moles as $\mathrm{n}_{\mathrm{A}}, \mathrm{n}_{\mathrm{B}}$ and…
View solution →Molarity $(\mathrm{M})$ of an aqueous solution containing $x \mathrm{~g}$ of anhyd. $\mathrm{CuSO}_4$ in $500 \mathrm{~mL}$ solution at $32^{\circ} \mathrm{C}$ is $2 \times…
View solution →6.023 $\times$ 1022 molecules are present in 10 g of a substance 'x'. The molarity of a solution containing 5 g of substance 'x' in 2 L solution is _____ × 10-3
View solution →On complete combustion, $0.492 \mathrm{~g}$ of an organic compound gave $0.792 \mathrm{~g}$ of $\mathrm{CO}_{2}$. The % of carbon in the organic compound is ___________ (Nearest…
View solution →$1 \mathrm{~g}$ of a carbonate $\left(\mathrm{M}_{2} \mathrm{CO}_{3}\right)$ on treatment with excess $\mathrm{HCl}$ produces $0.01 \mathrm{~mol}$ of $\mathrm{CO}_{2}$. The molar…
View solution →The mass of sodium acetate $\left(\mathrm{CH}_3 \mathrm{COONa}\right)$ required to prepare $250 \mathrm{~mL}$ of $0.35 \mathrm{~M}$ aqueous solution is ________ g. (Molar mass of…
View solution →A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is _____________ (mol. wt. of H2O2 = 34; mol.…
View solution →Chlorophyll extracted from the crushed green leaves was dissolved in water to make $2 \mathrm{~L}$ solution of Mg of concentration $48\, \mathrm{ppm}$. The number of atoms of…
View solution →A reaction of 0.1 mole of Benzylamine with bromomethane gave 23 g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n…
View solution →A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is: (Atomic mass : Cl = 35.5 amu, H = 1 amu)
View solution →What is the mass ratio of ethylene glycol ($\mathrm{C_2H_6O_2}$, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous…
View solution →Concentrated nitric acid is labelled as $75 \%$ by mass. The volume in mL of the solution which contains 30 g of nitric acid is ______________. Given : Density of nitric acid…
View solution →In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr. The percentage of bromine in the compound is ______________. (Nearest…
View solution →The number of moles of methane required to produce $11 \mathrm{~g} \mathrm{~CO}_2(\mathrm{g})$ after complete combustion is : (Given molar mass of methane in $\mathrm{g}…
View solution →In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition…
View solution →If a rocket runs on a fuel (C15H30) and liquid oxygen, the weight of oxygen required and CO2 released for every litre of fuel respectively are : (Given : density of the fuel is…
View solution →15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr2O$_7^{2 - }$. The molarity of the Fe2+ solution is __________ $\times$ 10-2…
View solution →$2MnO_4^ - + b{C_2}O_4^{2 - } + c{H^ + } \to xM{n^{2 + }} + yC{O_2} + z{H_2}O$If the above equation is balanced with integer coefficients, the value of c is ___________. (Round…
View solution →The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to the nearest integer)[Given : Atomic weight in g mol$-$1 -…
View solution →Blister copper is produced by reaction of copper oxide with copper sulphide. 2Cu2O + Cu2S $\to$ 6Cu + SO2 When 2.86 $\times$ 103 g of Cu2O and 4.77 $\times$ 103 g of Cu2S are used…
View solution →4g equimolar mixture of NaOH and Na2CO3 contains x g of NaOH and y g of Na2CO3. The value of x is ____________ g. (Nearest integer)
View solution →The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4.2H2O) in 250 mL of water in mol L$-$1 is x $\times$ 10$-$2. The value of x is _____________.…
View solution →$\mathrm{Xg}$ of ethylamine is subjected to reaction with $\mathrm{NaNO}_2 / \mathrm{HCl}$ followed by water; evolved dinitrogen gas which occupied $2.24 \mathrm{~L}$ volume at…
View solution →$$ \begin{aligned} &\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+400 \mathrm{~kJ} \\ &\mathrm{C}(\mathrm{s})+\frac{1}{2}…
View solution →A sample of $\mathrm{CaCO}_3$ and $\mathrm{MgCO}_3$ weighed $2.21 \mathrm{~g}$ is ignited to constant weight of $1.152 \mathrm{~g}$. The composition of mixture is : (Given molar…
View solution →Hemoglobin contains $0.34 \%$ of iron by mass. The number of Fe atoms in $3.3 \mathrm{~g}$ of hemoglobin is (Given: Atomic mass of Fe is $56 \,\mathrm{u},…
View solution →The density of NaOH solution is 1.2 g cm$-$3. The molality of this solution is _____________ m. (Round off to the Nearest Integer)[Use : Atomic mass : Na : 23.0 u, O : 16.0 u, H :…
View solution →Complete combustion of 3g of ethane gives x $\times$ 1022 molecules of water. The value of x is __________. (Round off to the Nearest Integer). [Use : NA = 6.023 $\times$ 1023;…
View solution →On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is _____________.…
View solution →$0.05 \mathrm{~cm}$ thick coating of silver is deposited on a plate of $0.05 \mathrm{~m}^2$ area. The number of silver atoms deposited on plate are ________ $\times 10^{23}$. (At…
View solution →The quantity which changes with temperature is :
View solution →The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is ___________.
View solution →Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :
View solution →The number of N atoms in 681 g of C7H5N3O6 is x $\times$ 1021. The value of x is (NA = 6.02 $\times$ 1023 mol$-$1) (Nearest Integer)
View solution →The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______. (molar mass of MgSO4 is 120.37 g/mol)
View solution →Volume of $3 \mathrm{M} \mathrm{~NaOH}$ (formula weight $40 \mathrm{~g} \mathrm{~mol}^{-1}$ ) which can be prepared from $84 \mathrm{~g}$ of $\mathrm{NaOH}$ is __________ $\times…
View solution →The molarity of $1 \mathrm{~L}$ orthophosphoric acid $\left(\mathrm{H}_3 \mathrm{PO}_4\right)$ having $70 \%$ purity by weight (specific gravity $1.54 \mathrm{~g}…
View solution →1 L aqueous solution of H2SO4 contains 0.02 m mol H2SO4. 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A), 0.01 m mol of H2SO4 are…
View solution →The density of '$x$' $\mathrm{M}$ solution ('$x$' molar) of $\mathrm{NaOH}$ is $1.12 \mathrm{~g} \mathrm{~mL}^{-1}$, while in molality, the concentration of the solution is $3…
View solution →A solution of $\mathrm{H}_2 \mathrm{SO}_4$ is $31.4 \% \mathrm{H}_2 \mathrm{SO}_4$ by mass and has a density of $1.25 \mathrm{~g} / \mathrm{mL}$. The molarity of the $\mathrm{H}_2…
View solution →A solution is prepared by adding $2 \mathrm{~g}$ of "$\mathrm{X}$" to 1 mole of water. Mass percent of "$\mathrm{X}$" in the solution is :
View solution →Combustion of glucose $(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6)$ produces $\mathrm{CO}_2$ and water. The amount of oxygen (in $\mathrm{g}$) required for the complete combustion…
View solution →An average person needs about 10000 kJ energy per day. The amount of glucose (molar mass = 180.0 g mol$-$1) needed to meet this energy requirement is ____________ g.(Use :…
View solution →Consider the reaction $$4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{H}_{2}…
View solution →120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO2 and 270 g of water on complete combustion. The percentage of carbon and hydrogen,…
View solution →An aqueous KCl solution of density 1.20 g mL$-$1 has a molality of 3.30 mol kg$-$1. The molarity of the solution in mol L$-$1 is ____________ (Nearest integer) [Molar mass of KCl…
View solution →$1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right]$ Br is mixed with $1 \mathrm{~L}, 0.02 \mathrm{M}$ solution…
View solution →Two elements A and B which form 0.15 moles of A2B and AB3 type compounds. If both A2B and AB3 weigh equally, then the atomic weight of A is _____________ times of atomic weight of…
View solution →When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO$_2$ was produced. The molar mass of compound is _____________ g mol$^{-1}$ (Nearest…
View solution →56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.
View solution →An organic compound gives $0.220 \mathrm{~g}$ of $\mathrm{CO}_{2}$ and $0.126 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ on complete combustion. If the $\%$ of carbon is 24 then…
View solution →Molality $(\mathrm{m})$ of $3 \mathrm{M}$ aqueous solution of $\mathrm{NaCl}$ is : (Given : Density of solution $=1.25 \mathrm{~g} \mathrm{~mL}^{-1}$, Molar mass in $\mathrm{g}…
View solution →$$ \mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})} $$ $20 \mathrm{~g} \quad ~~~5 \mathrm{~g}$ Consider the above…
View solution →The mole fraction of glucose (C6H12O6 ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______.
View solution →The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of [Co(NH3)6]Cl3 is ________. M[Co(NH3)6Cl3] = 267.46 g/mol MAgNO3 = 169.87 g/mol
View solution →The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is _______.
View solution →In the given reaction, $X+Y+3 Z \leftrightarrows X YZ_{3}$ if one mole of each of $X$ and $Y$ with $0.05 \mathrm{~mol}$ of $Z$ gives compound $X Y Z_{3}$. (Given : Atomic masses…
View solution →The strength of 50 volume solution of hydrogen peroxide is ______ $\mathrm{g} / \mathrm{L}$ (Nearest integer). Given: Molar mass of $\mathrm{H}_{2} \mathrm{O}_{2}$ is $34…
View solution →The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces 4 times its own volume of CO2 is CxHy. The value of y is…
View solution →4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x $\times$ 10-1. The value of x is _______. (Rounded off to the…
View solution →If 80 g of copper sulphate CuSO4 . 5H2O is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x $\times$ 10$-$3 mol L$-$1.…
View solution →Consider the following equations : 2Fe2+ + H2O2 $\to$ xA + yB (in basic medium) 2MnO4- + 6H+ + 5H2O2 $\to$ x'C + y'D + z'E (in acidic medium) The sum of the stoichiometric…
View solution →A $100 \mathrm{~mL}$ solution of $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}$ on treatment with methanol produces $2.24 \mathrm{~mL}$ of a gas at STP. The weight of gas…
View solution →A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of $\mathrm{H}_{2}$ gas at STP. The number of alcoholic hydrogens present in compound…
View solution →Density of 3 M NaCl solution is $1.25 \mathrm{~g} / \mathrm{mL}$. The molality of the solution is :
View solution →Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is _______. Atomic weight…
View solution →From $6.55 \mathrm{~g}$ of aniline, the maximum amount of acetanilide that can be prepared will be ________ $\times 10^{-1} \mathrm{~g}$.
View solution →The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34…
View solution →A metal chloride contains $55.0 \%$ of chlorine by weight . $100 \mathrm{~mL}$ vapours of the metal chloride at STP weigh $0.57 \mathrm{~g}$. The molecular formula of the metal…
View solution →When $\mathrm{Fe_{0.93}O}$ is heated in presence of oxygen, it converts to $\mathrm{Fe_2O_3}$. The number of correct statement/s from the following is ________ A. The equivalent…
View solution →Molality of 0.8 M H$_2$SO$_4$ solution (density 1.06 g cm$^{-3}$) is ________ $\times10^{-3}$ m.
View solution →5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution?…
View solution →When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution…
View solution →The Molarity (M) of an aqueous solution containing $5.85 \mathrm{~g}$ of $\mathrm{NaCl}$ in $500 \mathrm{~mL}$ water is : (Given : Molar Mass $\mathrm{Na}: 23$ and $\mathrm{Cl}:…
View solution →Molar mass of the salt from $\mathrm{NaBr}, \mathrm{NaNO}_3, \mathrm{KI}$ and $\mathrm{CaF}_2$ which does not evolve coloured vapours on heating with concentrated $\mathrm{H}_2…
View solution →If $50 \mathrm{~mL}$ of $0.5 \mathrm{M}$ oxalic acid is required to neutralise $25 \mathrm{~mL}$ of $\mathrm{NaOH}$ solution, the amount of $\mathrm{NaOH}$ in $50 \mathrm{~mL}$ of…
View solution →The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occuring chlorine is close to :
View solution →When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?
View solution →An organic compound has $42.1 \%$ carbon, $6.4 \%$ hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is :
View solution →Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$ Assertion A : $3.1500 \mathrm{~g}$ of hydrated oxalic…
View solution →The molality of a $10 \%(\mathrm{v} / \mathrm{v})$ solution of di-bromine solution in $\mathrm{CCl}_{4}$ (carbon tetrachloride) is '$x$'. $x=$ ____________ $\times 10^{-2}…
View solution →Mass of methane required to produce $22 \mathrm{~g}$ of $\mathrm{CO}_2$ after complete combustion is _______ g. (Given Molar mass in g mol-1 $\mathrm{C}=12.0$, $\mathrm{H}=1.0$,…
View solution →On complete combustion of $0.492 \mathrm{~g}$ of an organic compound containing $\mathrm{C}, \mathrm{H}$ and $\mathrm{O}$, $0.7938 \mathrm{~g}$ of $\mathrm{CO}_{2}$ and $0.4428…
View solution →$20 \mathrm{~mL}$ of calcium hydroxide was consumed when it was reacted with $10 \mathrm{~mL}$ of unknown solution of $\mathrm{H}_{2} \mathrm{SO}_{4}$. Also $20 \mathrm{~mL}$…
View solution →The flocculation value of HCl for arsenic sulphide sol. is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arsenic sulphide, the amount in grams, of H2SO4 in 250 ml…
View solution →The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of CO2 and 0.442 g of H2O. The percentage of oxygen composition in the organic…
View solution →A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is __________ $\times$ 103 g mol$-$1 [nearest integer]
View solution →The number of significant figures in 50000.020 $\times$ 10$-$3 is _____________.
View solution →Using the rules for significant figures, the correct answer for the expression ${{0.02858 \times 0.112} \over {0.5702}}$ will be
View solution →Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the…
View solution →'25 volume' hydrogen peroxide means
View solution →100 mL of Na3PO4 solution contains 3.45 g of sodium. The molarity of the solution is _____________ $\times$ 10$-$2 mol L$-$1. (Nearest integer)[Atomic Masses - Na : 23.0 u, O :…
View solution →The molarity of HNO3 in a sample which has density 1.4 g/mL and mass percentage of 63% is _____. (Molecular Weight of HNO3 = 63)
View solution →A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm$-$3. The molarity of the solution is ____________ mol dm$-$3. (Round off to the Nearest Integer).[Atomic masses : K :…
View solution →The number of atoms in 8g of sodium is x $\times$ 1023. The value of x is ____________. (Nearest integer)[Given : NA = 6.02 $\times$ 1023 mol$-$1Atomic mass of Na = 23.0 u]
View solution →A solution of sugar is obtained by mixing $200 \mathrm{~g}$ of its $25 \%$ solution and $500 \mathrm{~g}$ of its $40 \%$ solution (both by mass). The mass percentage of the…
View solution →Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively.…
View solution →The volume strength of 8.9 M H2O2 solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L atm K-1 mol-1) (rounded off ot the nearest integer)
View solution →Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ___________ $\times$ 10$-$1 g. (in nearest integer)
View solution →In basic medium $Cr{O_4}^{2 - }$ oxidises ${S_2}{O_3}^{2 - }$ to form $S{O_4}^{2 - }$ and itself changes into $Cr{(OH)_4}^ -$. The volume of 0.154 M $Cr{O_4}^{2 - }$ required to…
View solution →Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is __________ (Given : Molar mass of A = 84 g mol$^{-1}$)
View solution →The mole fraction of a solute in a 100 molal aqueous solution is ___________ $\times$ 10$-$2. (Round off to the Nearest Integer).[Given : Atomic masses : H : 1.0 u, O : 16.0 u ]
View solution →The number of molecules and moles in 2.8375 litres of O$_2$ at STP are respectively
View solution →Quantitative analysis of an organic compound (X) shows following % composition. C : $14.5 \%$ Cl : 64.46% H: 1.8 % (Empirical formula mass of the compound $(\mathrm{X})$ is…
View solution →$250 \mathrm{~g}$ solution of $\mathrm{D}$-glucose in water contains $10.8 \%$ of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are,…
View solution →10.30 mg of O2 is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O2 in ppm is__________.
View solution →The volume of HCl, containing 73 g L$^{-1}$, required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is __________ mL. (Nearest Integer)…
View solution →A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The…
View solution →If the concentration of glucose (C6H12O6) in blood is 0.72 g L$-$1, the molarity of glucose in blood is ____________ $\times$ 10$-$3 M. (Nearest integer)[Given : Atomic mass of C…
View solution →The density of $3 \mathrm{M}$ solution of $\mathrm{NaCl}$ is $1.0 \mathrm{~g} \mathrm{~mL}^{-1}$. Molality of the solution is ____________ $\times 10^{-2} \mathrm{~m}$. (Nearest…
View solution →Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial,…
View solution →The volume of hydrogen liberated at STP by treating $2.4 \mathrm{~g}$ of magnesium with excess of hydrochloric acid is _________ $\times ~10^{-2} \mathrm{~L}$ Given : Molar volume…
View solution →Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of $11.5 \mathrm{~g}$ of zinc with excess…
View solution →Molality of an aqueous solution of urea is $4.44 \mathrm{~m}$. Mole fraction of urea in solution is $x \times 10^{-3}$, Value of $x$ is ________. (Integer answer)
View solution →$10 \mathrm{~mL}$ of gaseous hydrocarbon on combustion gives $40 \mathrm{~mL}$ of $\mathrm{CO}_2(\mathrm{~g})$ and $50 \mathrm{~mL}$ of water vapour. Total number of carbon and…
View solution →Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organic compound is 15.3 and…
View solution →The ratio of the mass percentages of ‘C & H’ and ‘C & O’ of a saturated acyclic organic compound ‘X’ are 4 : 1 and 3 : 4 respectively. Then, the moles of oxygen gas…
View solution →$20 \mathrm{~mL}$ of $0.02 \,\mathrm{M} \,\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution is used for the titration of $10 \mathrm{~mL}$ of $\mathrm{Fe}^{2+}$ solution in…
View solution →The moles of methane required to produce 81 g of water after complete combustion is _____________ $\times$ 10$-$2 mol. [nearest integer]
View solution →$0.5 \mathrm{~g}$ of an organic compound $(\mathrm{X})$ with $60 \%$ carbon will produce __________ $\times 10^{-1} \mathrm{~g}$ of $\mathrm{CO}_{2}$ on complete combustion.
View solution →10.0 mL of Na2CO3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings :4.8 mL, 4.9 mL, 5.0 mL, 5.0 mL and 5.0 mLBased on these…
View solution →Number of moles of methane required to produce $22 \mathrm{~g} \mathrm{~CO}_{2(\mathrm{~g})}$ after combustion is $\mathrm{x} \times 10^{-2}$ moles. The value of $\mathrm{x}$ is…
View solution →In Carius method of estimation of halogen, $0.45 \mathrm{~g}$ of an organic compound gave $0.36 \mathrm{~g}$ of $\mathrm{AgBr}$. Find out the percentage of bromine in the…
View solution →100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x $\times$ 10$-$2. The value of x is ____________.…
View solution →Some amount of dichloromethane $\left(\mathrm{CH}_{2} \mathrm{Cl}_{2}\right)$ is added to $671.141 \mathrm{~mL}$ of chloroform $\left(\mathrm{CHCl}_{3}\right)$ to prepare $2.6…
View solution →The ammonia (NH3) released on quantitative reaction of 0.6 g urea (NH2CONH2) with sodium hydroxide (NaOH) can be neutralized by :
View solution →$\mathrm{SO}_{2} \mathrm{Cl}_{2}$ on reaction with excess of water results into acidic mixture $$\mathrm{SO}_{2} \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow…
View solution →The number of significant figures in 0.00340 is ____________.
View solution →A 0.166 g sample of an organic compound was digested with conc. H2SO4 and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N H2SO4. The used…
View solution →116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12,…
View solution →The number of units, which are used to express concentration of solutions from the following is _________ Mass percent, Mole, Mole fraction, Molarity, ppm, Molality
View solution →In sulphur estimation, 0.471 g of an organic compound gave 1.4439 g of barium sulphate. The percentage of sulphur in the compound is ____________ (Nearest Integer) (Given : Atomic…
View solution →A sample of a metal oxide has formula $\mathrm{M}_{0.83} \mathrm{O}_{1.00}$. The metal $\mathrm{M}$ can exist in two oxidation states $+2$ and $+3$. In the sample of…
View solution →The volume (in $\mathrm{mL}$) of $0.1 \mathrm{M} ~\mathrm{AgNO}_{3}$ required for complete precipitation of chloride ions present in $20 \mathrm{~mL}$ of $0.01 \mathrm{M}$…
View solution →Consider the following reaction : $$ 3 \mathrm{PbCl}_2+2\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4 \rightarrow \mathrm{Pb}_3\left(\mathrm{PO}_4\right)_2+6 \mathrm{NH}_4…
View solution →20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is _________ $\times 10^{-2} \mathrm{M}$. (Nearest integer)
View solution →During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is _________ %. (Given molar mass in…
View solution →When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ________ . (Nearest integer) Given : Molar mass of Al is…
View solution →0.01 mole of an organic compound $(X)$ containing $10 \%$ hydrogen, on complete combustion produced $0.9 \mathrm{~g} \mathrm{H}_2 \mathrm{O}$. Molar mass of $(\mathrm{X})$ is…
View solution →Xg of benzoic acid on reaction with aq $\mathrm{NaHCO}_3$ released $\mathrm{CO}_2$ that occupied 11.2 L volume at STP. X is _________ g.
View solution →Consider the following reaction occurring in the blast furnace: $$\mathrm{Fe}_3 \mathrm{O}_{4(\mathrm{~s})}+4 \mathrm{CO}_{(\mathrm{g})} \rightarrow 3 \mathrm{Fe}_{(\mathrm{l})}+4…
View solution →The molarity of a $70 \%$ (mass/mass) aqueous solution of a monobasic acid (X) is _________ $\times 10^{-1}$ M (Nearest integer) [Given: Density of aqueous solution of (X) is…
View solution →0.5 g of an organic compound on combustion gave 1.46 g of $\mathrm{CO}_2$ and 0.9 g of $\mathrm{H}_2 \mathrm{O}$. The percentage of carbon in the compound is _______________.…
View solution →Fortification of food with iron is done using $\mathrm{FeSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}$. The mass in grams of the $\mathrm{FeSO}_4$. $7 \mathrm{H}_2 \mathrm{O}$ required…
View solution →The amount of calcium oxide produced on heating 150 kg limestone ( $75 \%$ pure) is _________ kg. (Nearest integer) Given: Molar mass (in $\mathrm{g} \mathrm{mol}^{-1}$ ) of…
View solution →An organic compound weighing 500 mg , produced 220 mg of $\mathrm{CO}_2$, on complete combustion. The percentage composition of carbon in the compound is _________ $\%$. (nearest…
View solution →Butane reacts with oxygen to produce carbon dioxide and water following the equation given below. $$ \mathrm{C}_4 \mathrm{H}_{10}(\mathrm{~g})+\frac{13}{2}…
View solution →Amongst the following statements, that which was not proposed by Dalton was :
View solution →When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of $A$ ?
View solution →Which of the following have same number of significant figures? A. 0.00253 B. 1.0003 C. 15.0 D. 163 Choose the correct answer from the options given below
View solution →$2.8 \times 10^{-3} \mathrm{~mol}$ of $\mathrm{CO}_2$ is left after removing $10^{21}$ molecules from its ' $x$ ' mg sample. The mass of $\mathrm{CO}_2$ taken initially is Given:…
View solution →The elemental composition of a compound is $54.2 \% \mathrm{C}, 9.2 \% \mathrm{H}$ and $36.6 \% \mathrm{O}$. If the molar mass of the compound is $132 \mathrm{~g}…
View solution →Choose the correct statements.(A) Weight of a substance is the amount of matter present in it.(B) Mass is the force exerted by gravity on an object.(C) Volume is the amount of…
View solution →On complete combustion 1.0 g of an organic compound $(\mathrm{X})$ gave 1.46 g of $\mathrm{CO}_2$ and 0.567 g of $\mathrm{H}_2 \mathrm{O}$. The empirical formula mass of compound…
View solution →$$\mathrm{CaCO}_3(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{CaCl}_2(\mathrm{aq})+\mathrm{CO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{l})$$ Consider the…
View solution →Among $10^{-9} \mathrm{~g}$ (each) of the following elements, which one will have the highest number of atoms? Element: $\mathrm{Pb}, \mathrm{Po}, \mathrm{Pr}$ and Pt
View solution →10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl…
View solution →Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given: Molar mass of Mg is $24 \mathrm{~g} \mathrm{~mol}^{-1}$.
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