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JEE Main 20257 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
7 April
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2025 · 7 April · Evening Shift · Chemistry · d and f Block Elements

' X ' is the number of acidic oxides among VO_2 , V_2 O_3, CrO_3,...

' X ' is the number of acidic oxides among VO2\mathrm{VO}_2, V2O3,CrO3, V2O5\mathrm{V}_2 \mathrm{O}_3, \mathrm{CrO}_3, \mathrm{~V}_2 \mathrm{O}_5 and Mn2O7\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 X+Y\mathrm{X}+\mathrm{Y} is :

Options

  1. A5
  2. B4
  3. C2
  4. D3

Correct answer

A. 5

Step-by-step solution

CrO3= Acidic Mn2O7= Acidic ∴x=2\begin{aligned} & \mathrm{CrO}_3=\text{ Acidic } \\ & \mathrm{Mn}_2 \mathrm{O}_7=\text{ Acidic } \\ & \therefore \mathrm{x}=2\end{aligned}∴ Primary valency =3∴x+y=5\begin{aligned} & \therefore \text{ Primary valency }=3 \\ & \therefore \mathrm{x}+\mathrm{y}=5\end{aligned}$
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