CO2 is inert and harmless gas, yet it is thought to be a serious pollutant. Explain

CO_2 is inert and harmless gas, yet it is thought to be a serious pollutant. Explain.

A is a compound of calcium. On heating A a colourless gas B and a resides C are formed. When C is dissolved in water a compound D is obtained. When excess CO_2 is passed through the aqueous solution of D, E is formed. E on gentle heating gives A. Identify A, B, C and E.

Water is liquid while H_2S is a gas. Suggest reason for the above fact. Explain the phenomenon.

Except CO2 all other dioxides of group 14 exist as solid at room temperature. A student says that this is related to bonding. Explain the reason:

[Co(NH_3)_6]^3+ is an inner orbital complex whereas [Ni(NH_3)_6]^(2+) is an outer orbital complex.Explain.

Environmental pollution is the effect of undesiral changes in surroundings that have harmful effect on plants, animals and human beings. a) Explain the adverse effect of global warming. b) Choose the one which is not a component of photochemical smog. i) NO_2 ii) O_3 iii) SO_2