is the number of acidic oxides among and . The primary valency of cobalt in is Y. The value of X + Y is: [2025]

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Solution

Q.
$' X'$ 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: [2025]

1 5

2 4

3 2

4 3

Ans.
(1)

Oxide Nature

$V_{2} O_{3}$ Basic

${VO}_{2}$ Basic

$V_{2} O_{5}$ Amphoteric

${CrO}_{3}$ Acidic

${Mn}_{2} O_{7}$ Acidic, thus X = 2

Primary valency is oxidation state. Oxidation state of Co in ${[Co {(H_{2} {NCH}_{2} {CH}_{2} {NH}_{2})}_{3}]}_{2} {({SO}_{4})}_{3}$ is +3. So Y = 3. X + Y = 5.

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