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.

Why is fused calcium chloride and not potassium chloride kept in a desiccator?

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

Explain the meaning of the terms – hard water & soft water.