Question

70. The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B 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. What could be A, B, C and D?
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Answer 1

Explanation:

A iodine

B salt

C. starch

D iodine solution

Answer 2

Answer:

ITS FROM PRATICAL CHEMISTRY!!

HOPE U LIKE IT!

Explanation:

A)  Hydrated Copper sulfate or CuSo₄.7H₂O(As it is blue in its aqueous state)

B) WATER or H₂O

C) Anhydrous Copper Sulfate or CuSo₄

D) WATER or H₂O