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Q.

Which of the following ion does not exist?

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a

Cul42−

b

CrO42−

c

WO42−

d

VO43−

answer is A.

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Detailed Solution

  • One reason can be said that the size of iodine ions. and other is that
  •  [CuI4]2- does not exist because I- being a stronger reducing agent reduces Cu2+ to Cu+. 
  • 2CuI2→ 2CuI + I2
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