14
MCQ (Single Correct Answer)
The cell constant of a conductivity cell ............ .
A
changes with change of electrolyte
B
changes with change of concentration of electrolyte
C
changes with temperature of electrolyte
D
remains constant for a cell
15
MCQ (Single Correct Answer)
While charging the lead storage battery ............ .
A
$\mathrm{PbSO}_4$ anode is reduced to Pb
B
$\mathrm{PbSO}_4$ cathode is reduced to Pb
C
$\mathrm{PbSO}_4$ cathode is oxidised to Pb
D
$\mathrm{PbSO}_4$ anode is oxidised to $\mathrm{PbO}_2$
16
MCQ (Single Correct Answer)
$\Lambda_{\mathrm{m}\left(\mathrm{NH}_4 \mathrm{OH}\right)}^{\circ}$ is equal to ................ .
A
$\Lambda_{m\left(\mathrm{NH}_4 \mathrm{OH}\right)}^{\circ}+\Lambda_{m\left(\mathrm{NH}_4 \mathrm{Cl}\right)}^{\circ}-\Lambda_{(\mathrm{HCl})}^{\circ}$
B
$\Lambda_{m\left(\mathrm{NH}_4 \mathrm{Cl}\right)}^{\circ}+\Lambda_{m(\mathrm{NaOH})}^{\circ}-\Lambda_{(\mathrm{NaCl})}^{\circ}$
C
$\Lambda_{m\left(\mathrm{NH}_4 \mathrm{Cl}\right)}^{\circ}+\Lambda_{m(\mathrm{NaCl})}^{\circ}-\Lambda_{(\mathrm{NaOH})}^{\circ}$
D
$\Lambda_{m(\mathrm{NaOH})}^{\circ}+\Lambda_{m(\mathrm{NaCl})}^{\circ}-\Lambda_{\left(\mathrm{NH}_4 \mathrm{Cl}\right)}^{\circ}$
17
MCQ (Single Correct Answer)
In the electrolysis of aqueous sodium chloride solution which of the half cell reaction will occur at anode?
A
$\mathrm{Na}^{+}(\mathrm{aq})+\mathrm{e}^{-} \longrightarrow \mathrm{Na}(\mathrm{s}) E_{\mathrm{cell}}^{\mathrm{s}}=-2.71 \mathrm{~V}$
B
$2 \mathrm{H}_2 \mathrm{O}(\mathrm{I}) \longrightarrow \mathrm{O}_2(\mathrm{~g})+4 \mathrm{H}^{+}(\mathrm{aq})+4 \mathrm{e}^{-} E_{\text {cell }}^{\mathrm{s}}-1.23 \mathrm{~V}$
C
$\mathrm{H}^{+}(\mathrm{aq})+\mathrm{e}^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2(\mathrm{~g}) ; E_{\text {cell }}^{-}=0.00 \mathrm{~V}$
D
$\mathrm{Cl}^{-}(a q) \longrightarrow \frac{1}{2} \mathrm{Cl}_2(g)+e^{-} ; E_{\text {cell }}^{\mathrm{s}}=1.36 \mathrm{~V}$
18
MCQ (Multiple Correct Answer)
The positive value of the standard electrode potential of $\mathrm{Cu}^{2+} / \mathrm{Cu}$ indicates that ............ .
A
this redox couple is a stronger reducing agent than the $\mathrm{H}^{+} / \mathrm{H}_2$ couple
B
this redox couple is a stronger oxidising agent than $\mathrm{H}^{+} / \mathrm{H}_2$
C
Cu can displace $\mathrm{H}_2$ from acid
D
Cu cannot displace $\mathrm{H}_2$ from acid