Question

Match the species given in Column I with the properties mentioned in Column II.

Column I	Column II
(i) \[\ce{BF^{-}4}\]	(a) Oxidation state of central atom is +4
(ii) AICI3	(b) Strong oxidising agent
(iii) SnO	(c) Lewis acid
(iv) PbO2	(d) Can be further oxidised
	(e) Tetrahedral shape

Answer 1

Column I	Column II
(i) \[\ce{BF^{-}4}\]	(e) Tetrahedral shape
(ii) AICI3	(c) Lewis acid
(iii) SnO	(d) Can be further oxidised
(iv) PbO2	(b) Strong oxidising agent

Explanation:

(i) \[\ce{BF^{-}4}\]: Tetrahedral shape, sp³ hybridisation, regular geometry.

(ii) AlCl₃: Octet of Al not complete, acts as Lewis acid.

(iii) SnO: Sn²⁺ can show +4 oxidation state.

(iv) PbO₂: Due to inert pair effect, Pb⁴⁺ is less stable than Pb²⁺ and hence acts as strong oxidising agent.