Give reason for each of the following: (a) Bleaching of flowers by Cl_(2) is permanent while by SO_(2) is temporary. (b) Molten aluminium bromide is a poor conductor of electricity. (c ) Nitric oxide becomes brown when released in air. (d) PCl_(5) is ionic in nature in the solid state. (e ) Ammonia is a good complexing agent.

Give reason for each of the following: (a) Bleaching of flowers by Cl

1.	Give reason for each of the following: (a) Bleaching of flowers by Cl_(2) is permanent while by SO_(2) is temporary. (b) Molten aluminium bromide is a poor conductor of electricity. (c ) Nitric oxide becomes brown when released in air. (d) PCl_(5) is ionic in nature in the solid state. (e ) Ammonia is a good complexing agent.
Answer» Solution :(a) `Cl_(2)` bleaches by oxidation, while `SO_(2)` does it by reduction. The REDUCED product gets oxidise again and the colour is regained back. (b) Aluminium bromide exists as a dimer, `Al_(2)Br_(6)`. In this structure, each aluminium atom forms one coordinate BOND by accepting a lone PAIR of ELECTRONS from the bromine atom of another aluminiumbromide molecule and thus complete the octet of electrons. Due to lack of free electrons, molten aluminium bromide is a poor conductor of electricity. (c ) Nitric oxide reacts with air and oxidised into `NO_(2)` which is brown in colour. `2NO+O_(2)rarr 2NO_(2)` (d) In solid state `PCl_(5)` exists as `[PCl_(4)]^(+)[PCl_(6)]^(-)` and hence it is ionic in nature. Due to its ionic nature, it conducts current on fusion. (e) N atom in ammonia has lone pair of electrons which can coordinate with other atoms or cations required for the stability of electron pair.