Match the following compounds (Column-I) with
their uses (Column-II) :
| S.No. | Column-I | S.No. | Column-II |
|---|---|---|---|
| (I) | Ca(OH)2 | (A) | casts of statues |
| (II) | NaCl | (B) | white wash |
| (III) | CaSO4, ${1 \over 2}$H2O | (C) | antacid |
| (IV) | CaCO3 | (D) | washing soda
preparation |
Solution
(I) Ca(OH)<sub>2</sub>
is used in white wash due to its disinfectant nature.
<br><br>(II) NaCl is used in preparation of washing soda(Na<sub>2</sub>CO<sub>3</sub>).
<br>(1) 2NH<sub>3</sub>
+ H<sub>2</sub>O + CO<sub>2</sub> $\to$ (NH<sub>4</sub>
)<sub>2</sub>CO<sub>3</sub>
<br>(2) (NH<sub>4</sub>
)<sub>2</sub>CO<sub>3</sub>
+ H<sub>2</sub>O + CO<sub>2</sub> $\to$ 2NH<sub>4</sub>HCO<sub>3</sub>
<br>(3) NH<sub>4</sub>HCO<sub>3</sub>
+ NaCl $\to$ NH<sub>4</sub>Cl + NaHCO<sub>3</sub>
<br>(4) 2NaHCO<sub>3</sub> $\to$ Na<sub>2</sub>CO<sub>3</sub>
+ CO<sub>2</sub>
+ H<sub>2</sub>O
<br><br>(III) CaSO<sub>4</sub>.${1 \over 2}$H<sub>2</sub>O (Plaster of Paris) Used for making casts of
statues.
<br><br>(IV) CaCO<sub>3</sub> is used as an Antacid.
About this question
Subject: Chemistry · Chapter: s-Block Elements · Topic: Alkali Metals
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