Give reasons.
Water is not used to control fires involving electrical equipment.

Give reasons: What is lanthanoid contraction?

Explain how CO_2 is able to control fires.

Give reasons why carbon is tetravalent.

Give one use of esters.

Give reason Diamond is used as an abrasive.

Give reasons: Why is HCl not used to acidify a permanganate solution in volumetric estimation of Fe^(2+) or C_2O_4^(2-) ?

Give reason: Ce(4+) is used as an oxidising agent in volumetric analysis.

Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?