The value of K_c for the dissociation reaction, H₂ (g) $\rightleftharpoons$ 2H (g) is 1.2 × 10^-42

This equilibrium mixture contains mainly

• H₂ (g)

• H (g) atom

• 1.1 M mixture of H₂ and H

• 1.2 M mixture of H₂ and H

Among the following, the equilibrium which is not affected by an increase in pressure is

• C(s) + H₂O (g) $\rightleftharpoons$ CO(g) + H₂(g)

• 3Fe(s) + 4H₂O (g) $\rightleftharpoons$Fe₃O₄ (s) + 4H₂(g)

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

• H₂ (g) + I₂(s) $\rightleftharpoons$2Hi(g) 

K_sp of CaSO₄ is 4 × 10^-12. CaSO₄ is precipitated on mixing equal volumes of the following solutions.

• 3 × 10^-10 M CaCl₂ and 3 × 10^-6 M (NH₄)₂SO₄

• 4 × 10^-6 M CaCl₂ and 3 × 10^-6 M (NH₄)₂SO₄

• 6 × 10^-6 M CaCl₂ and 3 × 10^-16 M (NH₄)₂SO₄

• In all the above cases

What is pH of 2 x 10^-8 molar HCl solution? Here, log 2 = 0.301 and log 3 = 0.477.

• 6.92

• 9.5

• 5.4

• 7.7

385.

Which one of the following species acts as both Bronsted acid and base?

• H₂PO${}_2^{-}$

• HPO${}_3^{2-}$

• HPO${}_4^{2-}$

• All of these

The reaction, SO₂ + O₂ → 2SO₂ + Heat.

The equilibrium reaction proceeds in forward direction by

• addition of O₂

• removal of O₂

• addition of inert gas

• cannot proceed

Which is soluble in NaNO₃ and dil. HCl mixture and forming salt?

• (CH₃)₃CNH₂

• (CH₃)₂CHNH₂

• (CH₃)₂NH

• (CH₃)₃N

When one mole of A and one mole of B were heated in one litre flask at T(K), 0.5 mole of C was formed in the equilibrium,  A + B $\rightleftharpoons$ C + D the equilibrium constant, K_c is

• 0.25

• 0.5

• 1

• 2

If the solubility of Ca₃(PO₄)₂ in water is x mol L^-1, its solubility product in mol⁵L^-5 is

• 6x⁵

• 36x⁵

• 64x⁵

• 108x⁵

The buffer system which helps to maintain the pH of blood between 7.26 to 7.42, is

• H₂CO₃ /HCO${}_3^{-}$

• NH₄OH/ NH₄Cl

• CH₃COOH/ CH₃COO^-

• CH₃COONH₄