Question

The metal salt A is blue in color. When salt A is heated strongly over a burner, then a substance B present in it is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. (a) Identify A, B, C, D. (b) Write the chemical equations involved. (c) Give an example of the saltwhich also shows above property.

Answer 1

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Answer 2

(a) Identification of substance

• A is copper sulphatepentahydrate, when it is heated water from it gets eliminated as shown:

$CuSO_4.5H_2O\rightarrow CuSO_4 + 5H_2O$

• B is identifed as water as it gets eliminated as shown

$CuSO_4.5H_2O\rightarrow CuSO_4$

• C is identified as anhydrous copper sulfate.
• D is identified as Water.

(b) Chemical equation involved in the reaction

• $CuSO_4.5H_2O\rightarrow CuSO_4 + 5H_2O$

• $CuSO_4.5H_2O\rightarrow CuSO_4$

• $CuSO_4 + 5H_2O\rightarrow CuSO_4.5H_2O$

(c) Salt showing such property

• Salt such as  Ferrous sulfate heptahydrate, shows same property exhibited by copper sulphatepentahydrate.

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