Q. 703.5( 2 Votes )
The metal salt A
A is copper sulphatepentahydrate, CuSO4.5H2O; B is water, H2O; C is anhydrous copper sulphate, CuSO4; D is water, H2O.
Blue colour of copper sulphate is due to presence of 5 molecules of water. When copper sulphate is heated, it loses water molecules and turns into grey-white colour, which is known as anhydrous copper sulphate. After adding water; anhydrous copper sulphate becomes blue again.
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