Question

Three test tubes containing: 

Test Tube X : 5ml of HCl 

Test Tube Y ; 5ml of HNO₃ 

Test Tube Z : 15 ml of HCl + 5ml of HNO₃ 

A small piece of metal was added in all the three test tubes. It dissolves only in Test Tube Z. The metal is: 

(A) Al 

(B) Au 

(C) Cu 

(D) Ag

Answer 1

Correct option is (B) Au