941.

The dissociation equilibrium of a gas AB₂ can be represented as

$2{\mathrm{AB}}_{2_{\left(\mathrm{g}\right)}} \leftrightharpoons 2 {\mathrm{AB}}_{\left(\mathrm{g}\right)} + {\mathrm{B}}_{2_{\left(\mathrm{g}\right)}}$

The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant K_P and total pressure p is

• (2K_p/p)^1/2

• K_p/p

• 2K_p/p

• (2kp/p)^1/3

pH of a 0.01 M solution (K_a = 6.6 $\times$ 10^-4)

• 7.6

• 8

• 2.6

• 5

The pH of a 0.02 M solution of HCl is :

• 2.2

• 2.0

• 0.3

• 1.7

The solubility product of Mg(OH)₂ at 25°C is 1.4 x 10^-11 .What is the solubility of Mg(OH)₂ in g/L ?

• 0.0047 g/L

• 0.047 g/L

• 0.0087 g/L

• 0.087 g/L

A vessel of one litre capacity containing 1 mole of SO₃ is heated till a state of equilibrium is attained.

2SO_{3 (g)} $\rightleftharpoons$ 2SO_{2 (g)} + O_{2 (g)}

At equilibrium, 0.6 moles of SO₂ had formed. The value of equilibrium constant is

• 0.18

• 0.36

• 0.45

• 0.68

The equilibrium constant for mutarotation $\mathrm{\alpha }$-D Glucose $\rightleftharpoons$ $\mathrm{\beta }$-D Glucose is 1.8. What percentage of $\mathrm{\alpha }$ form remains at equilibrium?

• 35.7

• 64.3

• 55.6

• 44.4

Hydrofluoric acid is a weak acid. At 25°C, the molar conductivity of 0.002 M HF is 176.2 ${\mathrm{\Omega }}^{-1}$cm² mol^-1. If its $\wedge {°}_{\mathrm{m}}$ = 405.2 ${\mathrm{\Omega }}^{-1}$ cm² mol^-1. Equilibrium constant at the given concentration is

• 6.7 $\times$ 10^-4 M

• 3.2 $\times$ 10^-4 M

• 6.7 $\times$ 10^-5 M

• 3.2 $\times$ 10^-5 M

A buffer solution contains 500 mL of 0.2 M CH₃COONa and 500 ml of 0.1 M CH₃COOH .1 L of water is added to this buffer , pH before and after dilution will be (pka of CH₃COOH = 4.74)

• 3.74

• 5.04

• 5.90

• 7.70

Assertion : Heat of neutralisation of nitric acid with NaOH is same to that of HCI and NaOH.

Reason : In both cases strong acid and strong bases are neutralised.

H⁺ + OH^- $\to$H₂O

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

• If both assertion 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.

The conjugate base of (CH₃)₂NH₂⁺ is :

• (CH₃)₃N

• (CH₃)₂NH

• (CH₃)₂N^-

• (CH₃)₂N⁺