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Types of Unit Cell

Species forme...

Question

Species formed in experiment $A$ does not give test of $C u^{2 +}$ . It is due to the formation of:

A

[C u (N H_{3})_{4}] C l

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B

[C u (N H_{3})_{4}] S O_{4}

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C

C u (O H)_{2}

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D

C u

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Solution

The correct option is B $[C u (N H_{3})_{4}] S O_{4}$
Option (B) is correct. Species formed in experiment A does not give test of $C u^{2 +}$ . It is due to the formation of $[C u (N H_{3})_{4}] S O_{4}$ .

When $F e S O_{4}$ and $(N H_{4})_{2} S O_{4}$ solution are mixed, a double salt is formed. It has the formula $F e S O_{4} (N H_{4})_{2} S O_{4} .6 H_{2} O$ . In aqueous solution, the salt dissociates.

When $C u S O_{4}$ and $N H_{3}$ are mixed in the molar ratio of $1 : 4$ in solution, a complex $[C u (N H_{3})_{4}] S O_{4}$ is formed. It is a coordinated compound and dissociates to form $[C u (N H_{3})_{4}]^{2 +}$ and $S O_{4}^{2 -}$ .

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