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| ${N_2}$ in $cc$ | $6.25$ | $9.50$ | $11.42$ | $13.65$ | $35.05$ |
| Time (minutes) | $10$ | $15$ | $20$ | $25$ | Finally |
(Given atomic number of $\mathrm{Cr}$ is 24 )
$\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{O}_{3(\mathrm{~g})} \cdot \mathrm{K}_{\mathrm{P}}=2.47 \times 10^{-29} \text {. }$
$\Delta_{\mathrm{r}} \mathrm{G}^{\ominus}$ for the reaction is_______ $kJ$. (Given R $\left.=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right)$

$(b)$ $CoCl _{3} \cdot 5 NH _{3}$
$(c)$ $CoCl _{3} \cdot 6 NH _{3}$ and
$(d)$ $CoCl \left( NO _{3}\right)_{2} \cdot 5 NH _{3}$
Number of complex(es) which will exist in cistrans is/are ....

$Cr _{2} O _{7}^{2-}+14 H ^{+}+6 e ^{-} \rightarrow 2 Cr ^{3+}+7 H _{2} O$
The amount of $Cr ^{3+}$ obtained was $0.104\, g$. The
efficiency of the process(in\%) is
(Take : $F =96000\, C$, At. mass of chromium $=52$ )