Chemistry : Equilibrium

For the homogeneous reaction,

4NH₃ + 5O₂ $\rightleftharpoons$ 4NO + 6H₂O

the equilibrium constant K_c has the units

• conc.⁺¹⁰

• conc.⁺¹

• conc.^-1

• it is dimensionless

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

• Ag⁺

• Cu²⁺

• Cd²⁺

• Pb²⁺

Argol, a brown crust, formed during the fermentation of grape juice contains

• CO₂

• fused oil

• potassium hydrogen tartarate

• lye

The pH value of 0.001 M aqueous solution of NaCl is

• 7

• 4

• 11

• unpredictable

Which buffer solution comprising of the following has its pH value greater than 7?

• CH₃COOH + CH₃COONa

• HCOOH + HCOOK

• CH₃COONH₄

• NH₄OH + NH₄Cl

10^-6 M NaOH is diluted 100 times. The pH of the diluted base is

• between 7 and 8

• between 5 and 6

• between 6 and 7

• between 10 and 11

Which of the following is a Lewis acid ?

• OH^-

• H⁺

• F^-

• NH₃

Which of the following is correct?

• The pH of one litre solution containing 0.49 g of H₂SO₄ is 2.0

• The conjugate base of H₂S is S^2-

• BF₃ is a Lewis base

• Phenolphthalein is colourless in basic medium

Which of the following is correct ?

• Catalyst undergoes permanent chemical change

• Particle size of solute in true solution is 10^-3 m

• Starch solution is a hydrosol

• Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions

What is the equation for the equilibrium constant (Kc) for the following reaction?

$\frac{1}{2}\mathrm{A}\left(\mathrm{g}\right) + \frac{1}{3}\mathrm{B}\left(\mathrm{g}\right) \stackrel{\mathrm{T}\left(\mathrm{K}\right)}{\rightleftharpoons } \frac{2}{3}\mathrm{C}\left(\mathrm{g}\right)$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2 $}\right.}}{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}}{{\left[\mathrm{A}\right]}^{2 }{\left[\mathrm{B}\right]}^3}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}+{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}$