- AA thermodynamic concept.
- BA state function.
- CIndependent of path.
- DAll of the above.
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i.$\frac{\text{K}^+}{\text{K}}=-3.02\text{V}$ ii.$\frac{\text{Cu}^{2+}}{\text{Cu}}=+0.34\text{V}$
iii.$\frac{\text{Hg}^{2+}}{\text{Hg}}=0.92\text{V}$ iv.$\frac{\text{Cr}^{3+}}{\text{Cr}}=-0.74\text{V}$
Decreasing order of reducing power of these elements is:
Assertion $(A)$: Among group $13$ elements, boron's melting point is unusually high $(2453 \mathrm{~K})$.
Reason $(R):$ Solid boron has a strong crystalline lattice.
In the context of the above statements, choose the correct answer from the following options:
$(i)$ In pure water
$(ii)$ In presence of $0.1\ M AgNO_3$
$(iii)$ In presence of $2\ M aq.$ solution of $KCN$
$(iv)$ In presence of $ 1\ M aq$. solution of $Ca(CN)_2$
$(v)$ In presence of $2\ M aq.$ solution of $NH_3$
(Assuming $100\%$ dissociation of $AgNO_3, KCN$ and $Ca(CN)_2)$ and complex formation with $NH_3$ and $CN^-$ will take place.