‘X’ is the number of acidic oxides among VO2, V2O3, CrO3, V2O5 and Mn2O7. The primary valency of cobalt in [Co(H2NCH2NH2)3]2(SO4)3 is Y. The value of X + Y is : (A) 5 (B) 4 (C) 2 (D) 3

Question

‘X’ is the number of acidic oxides among VO2, V2O3, CrO3, V2O5 and Mn2O7. The primary valency of cobalt in [Co(H2NCH2NH2)3]2(SO4)3 is Y. The value of X + Y is :

(A) 5
(B) 4
(C) 2
(D) 3

Prashant Kotian · Accepted Answer

Correct answer: A. CrO3 = Acidic Mn2O7 = Acidic  X = 2 4 3 2 2 III ) SO ( ] ) NH CH NCH H ( Co [ – 4 3 2 2 III SO ] ) NH CH NCH H ( Co [    Primary valency = 3  x + y = 5

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