Give reasons :
Thermal stability decreases from `H_(2)O " to " H_(2)` Te.

Given reasion: (i) Thermal stability decreases from H_(2)O " to " H_(2)Te (ii) Fluoride ion has higher hydration enthalpy than chloride ion (iii) Nitrogen does not form pentahalide

Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in +3 oxidation state. overset(+3) (3HNO_(2)) to overset(+5)(HNO_(3)) +overset(+2)(2NO_(2))+H_(2)O Give reasons for the following : (i) Fluoride ion has higher hydration enthalpy than chloride ion. (ii) Thermal stability, decreases from H_(2)O " to " H_(2)Te .

Assertion : Acidic character of group 16 hydrides increases from H_(2)O" to "H_(2)Te . Reason : Thermal stablility of hydrides decreases down the group.

Which is the correct thermal stability order of H_(2)E(E=O,S,Se,Te and Po) ?

(i) Answer the following questions: a) Arrange the following in the increasing order of thermal stability: H_(2)O, H_(2)S, H_(2)Se, H_(2)Te b)Give the formula of the brown ring formed at the interface during the ring test for nitrate. (ii) A greenish yellow gas ‘A’ with pungent and suffocating odour, is a powerful bleaching agent. ‘A’ on treatment with dry slaked lime it gives bleaching powder. Identify ‘A’ and explain the reason for its bleaching action. Write the balanced chemical equation for the reaction of ‘A’ with hot and concentrated NaOH.

Give the decreasing order of thermal stability of the following .