MCQ
Select the correct statement about the given complex


- AIt has four ions in aqueous solution
- BPrimary valency of cobalt is six.
- ✓It give one mole of $AgCl$ ppt on reaction with excess of $AgNO_3$.
- DIt has one primary valency

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$A \,|\, A^+\, (xM)\, ||\, B^+ \,(yM)\, |\, B$
The $emf$ measured is $+ 0.20\, V.$ The cell reaction is
Given : $K _{ sp } Cu ( OH )_2=1 \times 10^{-20}$
$\operatorname{Take} \frac{2.303 RT }{ F }=0.059 \,V$
The reduction potential at $pH =14$ for the above couple is $(-) x \times 10^{-2}\,V$. The value of $x$ is $........$.