Which of the following are the example of double salt? (A) \(\mathrm{FeSO}_{4} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) (B) \(\mathrm{CuSO}_{4} \cdot 4 \mathrm{NH}_{3} \cdot \mathrm{H}_{2} \mathrm{O}\) (C) \(\mathrm{K}_{2} \mathrm{SO}_{4} \cdot \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O}\) (D) \(\mathrm{Fe}(\mathrm{CN})_{2} .4 \mathrm{KCN}\) Choose the correct answer.

JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Coordination Compounds

Which of the following are the example of double salt?
(A)

FeSO_{4} \cdot (NH_{4})_{2} SO_{4} \cdot 6 H_{2} O

(B)

CuSO_{4} \cdot 4 NH_{3} \cdot H_{2} O

(C)

K_{2} SO_{4} \cdot Al_{2} (SO_{4})_{3} \cdot 24 H_{2} O

(D)

Fe (CN)_{2} .4 KCN

Choose the correct answer.

(A)A and C only✓ Correct
(B)A and B only
(C)A, B and D only
(D)B and D only

Answer: (A)

Solution

A double salt is two simple salts crystallised together that dissociate completely into all their constituent ions in water, whereas a coordination compound keeps a complex ion in solution. Ferrous ammonium sulphate hexahydrate, Mohr's salt, and potash alum both break up into their simple ions and are double salts. Tetraamminecopper(II) sulphate monohydrate retains the

[Cu (N H_{3})_{4}]^{2 +}

ion, and

Fe (CN)_{2} \cdot 4KCN

is in fact potassium hexacyanidoferrate(II) containing

[Fe (CN)_{6}]^{4 -}

, so both of these are coordination compounds. The double salts among them are Mohr's salt and potash alum.

JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Single correct option

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JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Coordination Compounds

Solution

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