Assign the possible reason for the following:-`H_2O` is less acidic than `H_2S`.

Assign the possible reason for the following:- H_3PO_2 act as a good reducing agent while H_3PO_4 does not.

Account for the following:- H_2O is a liquid while H_2S Is a gas.

Give theoretical explanation for the following statements a) H_2S is acidic while H_2O is neutral.

Assign reason for the following:- The negative Value of electron gain enthalpy of fluorine is less than that of CI.

Which of the following will react with H_2 O

Write the conjugate acids of the following : NH_3,HCO_3^- and H_2O

Write expressions for the equilibrium constance for the following reactions. CuO(s)+H_2(g)iff Cu(s)+H_2O(g)

Name the type of preparation in which the following examples are involved. a) As_2 O_3+3 H_2 ~S rarr As_2 ~S_3+3 H_2 O b) SO_2+2 H_2 ~S rarr 2S+2 H_2 O c) FeCl_3 +3 H_2 O rarrFe(OH)_3+3 HCl

A list of reactions of sulphuric acid are given below. Zn + H_2SO_4 rarr ZnSO_4 + 2H_2O + SO_2 . 2C_2H_5OH + H_2SO_4 rarr C_2H_5-O-C_2H_5 + H_2O . 2NaOH + H_2SO_4 rarr Na_2SO_4 + 2H_2O . HCOOH + H_2SO_4 rarr H_2O + CO . 3H_2S + H_2SO_4 rarr 4H_2O + 4S . 2P + 5H_2SO_4 rarr 2H_3PO_4 + 2H_2O + 5SO_2 .Classify the reactions Into 3 sets based on the following properties of H_2SO_4 :- Oxidising property.