JEE MAIN - Chemistry (2025 - 7th April Evening Shift - No. 19)
'X' is the number of acidic oxides among VO2, V2O3, CrO3, V2O5 and Mn2O7. The primary valency of cobalt in
[Co(H2NCH2CH2NH2)3]2(SO4)3 is Y. The value of X + Y is _________.
[Co(H2NCH2CH2NH2)3]2(SO4)3 is Y. The value of X + Y is _________.
3
4
2
5
Explanation
In the given compounds, we evaluate which are acidic oxides:
CrO3 is acidic.
Mn2O7 is acidic.
Therefore, the number of acidic oxides, $ X $, is 2.
Next, for the complex $[Co(H2NCH2CH2NH2)3]2(SO4)3$, we consider its dissociation:
$ {[\mathop {Co}\limits^{III} {({H_2}NC{H_2}C{H_2}N{H_2})_3}]_2}{(SO_4)_3} \rightleftharpoons 2{[\mathop {Co}\limits^{III} {({H_2}NC{H_2}C{H_2}N{H_2})_3}]^{3+}} + 3SO_4^{2-} $
The primary valency of cobalt (Y) in this context is 3.
Thus, the value of $ X + Y $ is:
$ X + Y = 2 + 3 = 5 $
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