One mole of SO₃ was placed in a vessel of 1 L capacity at a certain temperature and the following equilibrium was established.

2SO₃ (g) $\rightleftharpoons$ 2SO₂ (g) + O₂ (g)

If 0.6 moles of SO₂ were formed at equilibrium, K_c for the reaction will be

• 0.036

• 0.45

• 0.54

• 0.675

Amines behave as :

• Lewis acid

• Lewis base

• aprotic acid

• neutral compound

The equilibrium constant for the reaction,

$\frac{1}{2}$${{\text{H}}_2}_{\left(g\right)}$$+$$\frac{1}{2}$${\text{I}}_{2_{\left(g\right)}}$$\rightleftharpoons$HI_(g) is K_c

Equilibrium constant for the reaction 2HI_(g) $\rightleftharpoons$H_2(g) + I_2(g)  will be

• 1/K_c

• 1/(K_c)²

• 2/K_c

• 2/(K_c)²

50 mL of 0.1 M HCl and 50 mL of 0.2 M NaOH are mixed .The pH of the resulting solution is :

• 1.30

• 4.2

• 12.70

• 11.70

Assertion : Mixture of CH₃COOH and CH₃COONH₄ is an example of acidic buffer.

Reason: Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both aaertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Conjugate acid of CH₃NH₂ is :

• CH₃OH

• CH₃NH₃⁺

• CH₂NH₂⁺

• CH₃N^-H

Which one of the following aqueous solutions of salts has the lowest pH value ?

• CH₃COONa

• NaCl

• NH₄OOCCH₃

• NH₄Cl

At equilibrium which is correct?

• $\text{∆}$G = 0

• $\text{∆}$S = 0

• $\text{∆}$H = 0

•  $\text{∆}$${\text{G}}^{°}$= 0

579.

If the solubility of PbCl₂ at 25°C is 6.3 x 10^-2 mol/L , its solubility product is :

• 1 x 10^-6

• 1 x 10^-3

• 1.1 x 10^-6

• 1.1 x 10^-5

Which of the following is most basic?

• Al(OH)₃

• Cr(OH)₃

• La(OH)₃

• Fe(OH)₃