Equilibrium

One mole of ammonia was completely absorbed in one litre solution each of

I. 1 M HCl

II. 1 M CH₃COOH 

III. 1 M H₂SO₄ at 298 K

The decreasing order for the pH of the resulting solution is (Given K_b (NH₃) = 4.74)

• II > III > I

• I > II > III

• II > I > III

• III > II > I

Conductivity of a saturated solution of a sparingly soluble salt AB at 298 K is 1.85 10^-6 Sm^-1. Solubility product of the salt AB at 298 K is

(Given, $\wedge {°}_{\mathrm{m}}$ (AB) = 140  Sm² mol^-1)

• 5.7 × 10^-12

• 1.32 × 10^-12

• 7.5 × 10^-12

• 1.74 

For the properties mentioned, the correct trend for the different species is in

• strength as Lewis acid - BCl₃ > AlCl₃ > GaCl₃

• inert pair effect - Al > Ga > ln

• oxidising property - Al³⁺ > ln³⁺ > Ti³⁺

• first ionization enthalpy - B > Al > Ti

In the reaction,

Fe(OH)₃ (s) $\rightleftharpoons$ Fe³⁺ (aq) + 3OH^- (aq), if the concentration of OH^- ions is decreased by $\frac{1}{4}$ times, then the equilibrium concentration of Fe³⁺ will increase by

• 8 times

• 16 times

• 64 times

• 4 times

Equilibrium constants K₁ and K₂ for the following equilibria,

I. NO (g) + $\frac{1}{2}$ O₂ (g) $\rightleftharpoons$ NO₂ (g)

II. 2NO₂ (g) $\rightleftharpoons$ 2NO (g) + O₂ (g) are related as

• K₁ = $\sqrt{{\mathrm{K}}_2}$

• K₂ = $\frac{1}{{\mathrm{K}}_1}$

• K₁ = 2K₂

• K₂ = $\frac{1}{{\mathrm{K}}_1^2}$

The pair of compound which cannot exist together in solution is

• NaHCO₃ and NaOH

• NaHCO₃ and H₂O

• NaHCO₃ and Na₂CO₃

• Na₂CO₃ and NaOH

Which is most basic in character ?

• CsOH

• KOH

• NaOH

• LiOH

Would gaseous HCl be considered as an Arrhenius acid ?

• Yes

• No

• Not known

• Gaseous HCl does not exist

The degree of hydrolysis in hydrolytic equilibrium

A^- + H₂O $\rightleftharpoons$ HZ + OH^-

at salt concentration of 0.001 M is :

(K_a = 1 × 10^-5)

• 1 × 10^-3

• 1 × 10^-4

• 5 × 10^-4

• 1 × 10^-6

pH of 1M NH₃ aqueous solution is (K_b = 1.8 × 10^-5)

• 11.13

• 12.5

• 13.42

• 11.55