The equilibrium constant for the reaction

2NO₂ (g) $\rightleftharpoons$ 2NO (g) + O₂ (g) is 2 × 10^-6 at 185°C. Then the equilibrium constant for the reaction,

4NO (g) + 2O₂ (g) $\rightleftharpoons$ 2NO₂ (g) at the same temperature would be

• 2.5 × 10^-5

• 4 × 10^-12

• 2.5 × 10¹¹

• 2 × 10⁶

The dissociation constant of acetic acid Ka is 1.74 × 10^-5 at 298 K. The pH of a solution of 0.1 M acetic acid is :

• 2.88

• 3.6

• 4.0

• 1.0

0.365g of HCl gas was passed through 100 cm³ of 0.2 M NaOH solution. The pH of the resulting solution would be :

• 13

• 9

• 8

• 5

In the given reaction,

2X (g) + Y (g) $\rightleftharpoons$ 2Z (g) + 80 kcal

Which combination of pressure and temperature will give the highest yield of Z at equilibrium?

• 1000 atm and 200°C

• 500 atm and 500°C

• 1000 atm and 100°C

• 500 atm and 100°C

505.

Which of the following compounds would have the smallest value for pK_a?

• CHF₂CH₂CH₂COOH

• CH₃CH₂CF₂COOH

• CH₂FCHFCH₂COOH

• CH₃CF₂CH₂COOH

A saturated solution of CaF₂ is 2 × 10^-4 mol/ L. Its solubility product constant is:

• 2.6 × 10^-9

• 4 × 10^-8

• 8 × 10^-12

• 3.2 × 10^-11

For the reaction,

H₂ (g) + I₂ (g) $\rightleftharpoons$ 2HI (g),

the equilibrium constants expressed in terms of concentrations K_c and in terms of partial pressures K_p, are related as:

• K_p = K_c (RT)²

• K_p = K_c(RT)^-2

• K_p = K_c

• K_c = K_p(RT)

Which of the following pairs are correctly matched?

1. Haber process	Manufacture of ammonia
2. Leblanc process	Manufacture of sulphuric acid
3. Birkeland-Eyde process	Manufacture of nitric acid
4. Solvay process	Manufacture of sodium carbonate

Select the correct answer using the codes given below-

• 1, 3 and 4

• 2, 3 and 4

• 1, 2, 3 and 4

• 1, 2 and 4

Which of the following will favour the reverse reaction in a chemical equilibrium ?

• Increasing the concentration of the reactants

• Removal of at least one of the products at regular intervals

• Increasing the concentration of one or more of the products

• Increasing the pressure

K_p and K_c are related as :

• K_p = K_c(RT)^Δn

• K_p + K_c = (RT)^Δn

• K_c= K_p

• K_p .K_c= (RT)^Δn