Question 21 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

Question 21 2 mL each of concentrated HCl,HNO3 and a mixture of concen

1.	Question 21 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» Question 21 2 mL each of concentrated $HCl, {HNO}_{3}$ and a mixture of concentrated $HCl$ and concentrated ${HNO}_{3}$ 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) $Pt$