Question

Statement 1: For a cell reaction
$Zn(s)+C{u}^{2+}(aq)\to Z{n}^{2+}(aq)+Cu(s);$ at the equilibrium,voltmeter gives zero reading.
Statement 2: At the equilibrium, there is no change in the concentration of $C{u}^{2+}$ and $Z{n}^{2+}$.

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
• B. If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true

Answer 1

Answer: (A)

$Zn(s)+C{u}^{2+}(aq)\to Zn{2+}_{aq}+Cu(s)$ As the time passes, the concentration of $Z{n}^{2+}$ keeps on increasing while the concentration of $C{u}^{2+}$ keeps on decreasing. At the same time voltage of the cell keeps on decreasing. When there is no change in concentration of $C{u}^{2+}$ and $Z{n}^{2+}$ ions, voltmeter gives zero reading and this state is known as equilibrium.