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Evaporation of solution of CuSO4 helps in?

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Evaporation of solution of CuSO4 helps in?

(a) making it concentrated

(b) crystallization of CuSO4

(c) evaporation of salt CuSO4

(d) concentration and crystallization

I had been asked this question during an interview.

My doubt is from Evaporator topic in section Building Blocks of Dairy Processing of Dairy Engineering

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The correct choice is (d) concentration and crystallization

Easiest explanation: The solution turns blue because of diffusion. On heating the solution nothing will happen. Evaporation of solution of CuSO4 leads to its concentration and crystal formation.

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