engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) General Science Chemistry Chemical Reaction
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