X ' is the number of acidic oxides among VO_ 2 , V_ 2 O_ 3 , CrO_ 3 , ~V_ 2 O_ 5 and Mn_ 2 O_ 7 . The primary valency of cobalt in [Co (H_ 2 NCH_ 2 CH_ 2 NH_ 2 )_ 3 ]_ 2 (SO_ 4 )_ 3 is Y . The value of X+Y is :

X ' is the number of acidic oxides among VO_ 2 , V_ 2 O_ 3 , CrO_…

MCQ

X ' is the number of acidic oxides among $\mathrm{VO}_{2}$,
$\mathrm{V}_{2} \mathrm{O}_{3}, \mathrm{CrO}_{3}, \mathrm{~V}_{2} \mathrm{O}_{5}$ and $\mathrm{Mn}_{2} \mathrm{O}_{7}$. The primary valency of cobalt in $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)_{3}\right]_{2}\left(\mathrm{SO}_{4}\right)_{3}$ is Y .
The value of $\mathrm{X}+\mathrm{Y}$ is :

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Answer

A. 5
$\mathrm{CrO}_{3}=$ Acidic
$\mathrm{Mn}_{2} \mathrm{O}_{7}=$ Acidic
$\therefore \mathrm{x}=2$
$\left[{ }^{\text {III }} \mathrm{Co}\left(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)_{3}\right]_{2}\left(\mathrm{SO}_{4}\right)_{3} \rightleftharpoons$
$2\left[\mathrm{Col}\left(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)_{3}\right]^{3+}+3 \mathrm{SO}_{4}^{2-}$
$\therefore$ Primary valency $=3$
$\therefore \mathrm{x}+\mathrm{y}=5$