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Q.

The deep blue colour produced on adding excess of ammonia to copper sulphate is due to presence of

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a

$Cu {({NH}_{3})}_{4}^{2 +}$

b

$Cu {({NH}_{3})}_{2}^{2 +}$

c

${Cu}^{2 +}$

d

$Cu {({NH}_{3})}_{6}^{2 +}$

answer is B.

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Detailed Solution

${CuSO}_{4} + 4 {NH}_{3} \to [Cu {({NH}_{3})}_{4}] {SO}_{4}$
Blue complex due to Cu ${[Cu {({NH}_{3})}_{4}]}^{+ 2}$

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