A copper plate was dipped into a solution of `AgNO_(3)`. After sometime, a black layer was deposited on the copper plate. State the reason for it. Write the chemical equation for the reaction involved.

Explanation

Copper lies above silver in the activity series. This means that copper is more reactive than silver. Therefore, copper has replaced silver from `AgNO_(3)` solution. Silver got deposited on the copper plate and changed to black after sometime because silver and also some salts of silver are sensitive to light. They readily become blackish on standing or on exposure to air.
`Cu(s) + 2AgNO_(3)(aq) rarr Cu(NO_(3))_(2)(aq) + underset(("Black"))(2Ag(s))`