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When ammonia, is added to green aqueous ...

When ammonia, is added to green aqueous solution of nickel (II) sulphate, the colour of the solution changes to blue violet. This is caused by:

A

Nickel undergoing a change in oxidation state

B

Ammonia molecules replacing water molecules surrounding nickel

C

Change in co-ordination number of nickel

D

Change in pH value of the s

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The correct Answer is:
B
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