Question

Choose the correct set of options matching appropriate properties of column-I with column-II $\begin{array}{cccc}& \text{Column- I}& & \text{Column- II}\\ \left(a\right)& \text{Hydrogen electrode, reduction potential, set up in 1.0 M KCl,}p{H}_2=1atm)& \left(p\right)& 1.24V\\ \left(b\right)& Pt\left(H_{2}at1atm\right)|H^{+}(pH=2)& \left(q\right)& -0.414V\\ \left(c\right)& Hg|H{g}_{2}C{l}_2|C{l}^{-}\left(0.1M\right)||C{l}^{-}\left(0.01M|Pt\right(C{l}_2\left)\right)& \left(r\right)& 0.118V\\ \left(d\right)& \text{Reduction potential : AgI(aq) saturated}|Ag(E_{A{g}^{+}/Ag}^{\circ }=0.8V.K_{sp}\text{of AgI}={10}^{-16})& \left(s\right)& 0.327V\\ & & \left(t\right)& \text{Metal - metal insoluble salt electrode}\end{array}$

• A. (a) – (q); (b) – (r); (c) – (p, t); (d) – (s, t)
• B. (a) – (r); (b) – (q); (c) – (q, t); (d) – (s, t)
• C. (a) – (q, t); (b) – (s, t); (c) – (p); (d) – (q, r, s)
• D. (a) – (p, r); (b) – (q, s, t); (c) – (r, t); (d) – (p, q, s)

Answer 1

The correct option is A (a) – (q); (b) – (r); (c) – (p, t); (d) – (s, t)

$\left(a\right)2H^{+}+2e^{-}\to H_2$

$E=-\frac{0.0591}{2}log\frac{1}{{\left[{10}^{-7}\right]}^2}=-0.414V$

$\left(b\right)H_2\to 2H^{+}+2e^{-}$

$E=-\frac{0.0591}{2}log[{10}^{-2}{]}^2=1.18V$


$\left(c\right)2Hg+C{l}_2\to H{g}_2^{2+}+2C{l}^{-}$
$2C{l}^{-}\to C{l}_2+2e^{-}$

$\left(d\right)A{g}^{+}+e^{-}\to Ag$

$\left(A{g}^{+}\right)=\sqrt{{10}^{-16}}={10}^{-8}M$