When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous `NaCl` to the blue solution gives a white precipitate O. Addition of aqueous `NH_(3)` dissolves O and gives an intense blue solution.
The compound N is

Options

A. `AgNO_(3)`
B. `Zn(NO_(3))_(2)`
C. `Al(NO_(3))_(2)`
D. `Pb(NO_(3))_(2)`

Answer

b

Explanation

Solution M is of silver nitrate. It acquires a blue colour of the reacting with copper
Cu(s) + `2AgNO_3`(aq) `` `Cu(NO_3)_2`(aq) Blue + 2Ag(s)