Easy MCQ +4 / -1 PYQ · JEE Mains 2021

The major components in "Gun Metal” are :

  1. A Al, Cu, Mg and Mn
  2. B Cu, Ni and Fe
  3. C Cu, Sn and Zn Correct answer
  4. D Cu, Zn and Ni

Solution

Composition of Gun metal $\to$ 90% Cu + 8% Sn + 2% Zn<br><br>Note :<br><br><style type="text/css"> .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-baqh{text-align:center;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} </style> <table class="tg"> <thead> <tr> <th class="tg-baqh"><b>Alloys</b></th> <th class="tg-0lax"><b>Composition</b></th> </tr> </thead> <tbody> <tr> <td class="tg-baqh">Brass</td> <td class="tg-0lax">60% Cu + 40% Zn</td> </tr> <tr> <td class="tg-baqh">Bronze</td> <td class="tg-0lax">75-90% Cu + 10-25% Sn</td> </tr> <tr> <td class="tg-baqh">Gun-metal</td> <td class="tg-0lax">90% Cu + 8% Sn + 2% Zn</td> </tr> <tr> <td class="tg-baqh">Aluminium bronze</td> <td class="tg-0lax">90% Cu + 10% Al</td> </tr> <tr> <td class="tg-baqh">Monel metal</td> <td class="tg-0lax">30% Cu + 67% Ni + 3% (Fe + Mn)</td> </tr> <tr> <td class="tg-baqh">German Silver</td> <td class="tg-0lax">56% Cu + 24% Zn + 20% Ni</td> </tr> <tr> <td class="tg-baqh">Manganin</td> <td class="tg-0lax">78-86% Cu + 13-18% Mn + 1-4% Ni</td> </tr> <tr> <td class="tg-baqh">Bell metal</td> <td class="tg-0lax">80% Cu + 20% Sn</td> </tr> <tr> <td class="tg-baqh">Constantan</td> <td class="tg-0lax">60% Cu + 40% Ni</td> </tr> </tbody> </table>

About this question

Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family

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