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Which of the following is a complex salt?

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in Chemistry – Class 12 by (188k points)
Which of the following is a complex salt?

(a) Potassium aluminium sulphate

(b) Ammonium iron(ll) sulphate

(c) Carnallite

(d) Potassium ferrocyanide

This question was posed to me in semester exam.

My doubt stems from Werner’s Theory of Coordination Compounds topic in portion Coordination Compounds of Chemistry – Class 12

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Right option is (d) Potassium ferrocyanide

Easiest explanation: Potassium ferrocyanide, K4[Fe(CN6)], is a complex salt that does not dissociate into Fe^2+ and CN^– ions when dissolved in water. The other three, i.e., potash alum, carnallite and Mohr’s salt are double salt that dissociate into simple ions completely when dissolved in water.

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