What is the function of ammonium hydroxide in group IV? 

What is the function of NH₄Cl in group V analysis?

What is the necessity of adding NH₄OH in group V analysis?

Give reason:  The precipitation of Mg(OH)₂ is prevented by the addition of NH₄Cl prior to the addition of NH₄OH. But its precipitation by NaOH is not prevented by the prior addition of NaCl.

In which of the following, silver chloride will dissolve more:
(i) Pure water
(ii) 0·1M AgNO₃ solution?

The equilibrium constant at 298 K for a reaction A+B ⇌ C+D is 100. If the initial concentration of all the four species were 1 M each, then equilibrium concentration of D (in mol L⁻¹ ) will be:

• 0.818

• 1.818

• 1.182

• 1.182

For the reaction,


if K_p = K_c (RT)^x where the symbol has usual meaning then the value of x is (assuming ideality)

• -1

• -1/2

• 1/2

• 1/2

The species which can best serve as an initiator for the cationic polymerization is

• LiAlH₄

• HNO₃

• AlCl₃

• AlCl₃

The equilibrium constant (Kc) for the reaction, N₂(g) + O₂ (g) → 2NO (g) at temperature T is 4 x 10-4. The value of Kc for the reaction  at the same temperature is

• 0.02

• 2.5 x 10²

• 4 x 10^-4

• 4 x 10^-4