Which of the anhydrous salts when come in contact with water turns blu

1.	Which of the anhydrous salts when come in contact with water turns blue [AMU 1981, 82]
A.	Ferrous sulphate
B.	Copper sulphate
C.	Zinc sulphate
D.	Cobalt sulphate
Answer» C. Zinc sulphate

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Which of the anhydrous salts when come in contact with water turns blue [AMU 1981, 82]

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