How much charge is required for the reduction of 1 mol of Zn²⁺ to Zn?

Write the dispersed phase and dispersion medium of butter.

Write the structures of the following molecules:
(i) H₂SO₃
(ii) XeOF₄

 Using IUPAC norms write the formulate for the following coordination compounds:

(i) Hexaamminecobalt (III) chloride
(ii) Potassium tetrachloridonickelate (II)

Define rate of reaction? Write two factors that affect the rate of reaction.

Arrange the following in increasing order of their basic strength:

(i) C₆H₅ – NH₂, C₆H₅ – CH₂ – NH₂, C₆H₅ – NH – CH₃

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent? Why is elevation of boiling point a colligative property?

(i) What is the principle behind the zone refining of metals?

(ii) What is the role of silica in the extraction of copper?

(iii) How is 'cast iron' different from 'pig iron'?