Question

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
(a) Al

(b) Au

(c) Cu

(d) Pt

Answer 1

Answer: Au
Option b is correct

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Answer 2

Answer:

b. Au

Explanation:

it Gold is a noble metal that cannot dissolve in dilute acids and dissolves only in aqua regia.