Q.

Identify the wrong match from the  following

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a

Yb+2Z=70……diamagnetic

b

CuI2………. Stable

c

Cu+aq…….undergoes disproportionation

d

VF5……..can exist

answer is B.

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Detailed Solution

1Yb(Z=70)......[Xe]4f145do6s2Yb+2.....[Xe]4f14.....n=0....diamagnetic(2)  CuI2 is unstable   2Cu+2+4I− → Cu2I2+I2(3) 2Cu+ → Cu+2+Cu........In aqueous solution(4) VF5 is stable due to high BDE
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