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Assertion : An original solution containing excess of Ni2+ ions gives a yellow coloured solution with potassium cyanide solution. 

Reason : A solution of Ni2+ ions gives red precipitate with dimethylglyoxime solution just made alkaline. 

Hint : Ni2+ + 2 CN → Ni(CN)2 ↓ green 

If CN  is in excess then 

Ni(CN)2¯ + 2 CN  → [Ni(CN)4]2– soluble yellow coloured complex.

(A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. 

(B) Both Assertion and Reason are true but Reason is not correct explanation of Assertion 

(C) Assertion is true but Reason is false 

(D) Assertion is false but Reason is true

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(D) Assertion is false but Reason is true.

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