Differentiate between hydrated and anhydrous crystals with examples. State three defined changes which occur when hydrated copper sulphate is heated.

Washing soda and iron [III] chloride are separately exposed to the atmosphere. State

(i) the observations seen (ii) the phenomenon which occurs (iii) the reason for the phenomenon occurring in each case.

Would a similar phenomenon occur in case of exposure of common salt. Explain giving reasons.

How does fused calcium chloride differ from iron [III] chloride when exposed to the atmosphere?

Conc. H₂SO₄ acts as a 'drying agent' & a 'dehydrating agent'. Explain and differentiate the words in italics.