2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3: 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
  1. Al
  2. Au
  3. Cu
  4. Pt

Correct Answer:  (b) Au

Explanation: Solution C is a mixture of Concentrated HCl and Concentrated HNO3 which is called aqua regia. Aqua Regia dissolves gold.


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Updated on: 10-Oct-2022


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