Question

2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentratedHNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece ofmetal was put in each test tube. No change occurred in test tubes A and B but the metal gotdissolved in test tube C respectively. The metal could be * 1 point (a) Al (b) Au (c) Cu (d) Pt

Answer 1

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