Question

Assertion: Copper can displace silver from an aqueous silver nitrate solution.

Reason: Silver is placed above copper in the reactivity series.

• A. Both assertion and reason are true and the reason is the correct explanation of assertion.
• B. Both assertion and reason are true but the reason is not the correct explanation of assertion.
• C. The assertion is true but the reason is false.
• D. Both assertion and reason are false.

Answer 1

The correct option is C

The assertion is true but the reason is false.

The explanation for the correct option.

(C) The assertion is correct but the reason is incorrect.

The explanation for the assertion.

Displacement reaction

1. In a displacement reaction, a more reactive atom or molecule replaces a less reactive atom or molecule to form new compounds.
2. Copper$\mathbf{\left(}\mathbf{Cu}\mathbf{\right)}$ is more reactive than silver$\mathbf{\left(}\mathbf{Ag}\mathbf{\right)}$ and can replace silver from its compounds.
3. Copper reacts with silver nitrate$\mathbf{\left(}{\mathbf{AgNO}}_{\mathbf{3}}\mathbf{\right)}$ to form copper(II) nitrate$\mathbf{\left(}\mathbf{Cu}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}\mathbf{\right)}$ and silver.

$\mathrm{Cu}\left(\mathrm{s}\right)+2{\mathrm{AgNO}}_3\left(\mathrm{aq}\right)\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+2\mathrm{Ag}\left(\mathrm{s}\right)$

Hence, the assertion is correct.

The explanation for the reason statement.

Reactivity series.

1. Reactivity series is the arrangement of metals in descending order according to their reactivity.
2. Silver is placed below copper in the reactivity series.

Hence, the reason is incorrect.

Therefore, the correct option is (C).