' X ' is the number of acidic oxides among $\mathrm{VO}_2$, $\mathrm{V}_2 \mathrm{O}_3, \mathrm{CrO}_3,…

' 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 :
  1. 5
  2. 4
  3. 2
  4. 3

Solution

$\begin{aligned} & \mathrm{CrO}_3=\text { Acidic } \\ & \mathrm{Mn}_2 \mathrm{O}_7=\text { Acidic } \\ & \therefore \mathrm{x}=2\end{aligned}$

$\begin{aligned} & \therefore \text { Primary valency }=3 \\ & \therefore \mathrm{x}+\mathrm{y}=5\end{aligned}$

Asked in: JEE Main 2025 (07 Apr Shift 2)

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