Question

Q. 12. 2 mL each of concentrated HCl,
HNO, and a mixture of concentrated HCI
and concentrated HNO, 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:
remove
(a) Al
(b) Au
(C) Cu
(d) Pt

​

Answer 1

Answer:

(d) Pt

Explanation:

Platinum can only be dissolved in a mixture of conc. HCl and conc. HNO3 in the ratio 3 : 1 , called aqua regia.

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