Question

4.What informations can be drawn from the given figure? (i) The blue colour of copper sulphate becomes colourless and drops of water are obtained. (ii) Crystals of salts are not really dry. (iii) copper sulphate crystals which seems to be dry contain water of crystalisation. (iv) If we moisten the crystals again with water, blue colour of the crystals disappear. *A] (I) and (ii) B] (ii), (iii) and (iv) C] (III) and (iv) D] All the statements are correct 1 mark ​

Answer 1

Answer:

D) is the correct answer

Answer 2

Option D: 'All statements are correct' is the right answer.

Statement (i) is correct as presence of water in CuSO4 or Copper Sulphate is what imparts a blue colour to it. It is also called as Blue vitriol.

Statement (ii) and Statement (iii) is correct because the salt formed after the extraction of water is called anhydrous copper sulphate contain water of crystallisation.

Statement (iv) is correct as excess water added constitutes to the blue colour of Copper Sulphate.

The chemical reaction is as follows:

CuSO4.5H2O → CuSO4 + 5H2O

This reaction is endothermic in the forward direction meaning it needs heat and exothermic in the reverse.