What weight of hydrated oxalic acid should be added for complete neutralisation of 100 mL of 0.2 N -NaOH solution?

• 0.45 gm

• 0.90 gm

• 1.08 gm

• 1.26 gm

The number of moles of a solute in its solution is 20 and total number of moles are 80. The mole fraction of solute is

• 2.5

• 0.25

• 1

• 0.75

The relation between K_p and K_c is correctly shown as

• K_c = K_p (RT)${}^{∆{\mathrm{n}}_{\mathrm{g}}}$

• K_p = K_c (RT)${}^{-∆{\mathrm{n}}_{\mathrm{g}}}$

• K_p = K_c (RT)${}^{∆{\mathrm{n}}_{\mathrm{g}}}$

• K_c = K_p (RT)${}^{-∆{\mathrm{n}}_{\mathrm{g}}}$

In the formation of SO₃ according to following equilibrium 2SO₂ + O₂ $\rightleftharpoons$ 2SO₃ + heat, which conditions favour the formation of SO₃?

• Low pressure

• Low concentration of oxygen

• Low temperature and use of catalyst

• High temperature without using catalyst

Which of the following mixtures forms an acid buffer?

• NaOH + HCl

• CH₃COOH + CH₃COONa

• NH₄OH + NH₄Cl

• H₂CO₃ + (NH₄)₂CO₃

When NH₄Cl is added to NH₄OH solution, the dissociation of ammonium hydroxide is reduced. It is due to

• common ion effect

• hydrolysis

• oxidation

• reduction

Strongest Bronsted base among the following anions is

• ClO^-

• ClO${}_2^{-}$

• ClO${}_3^{-}$

• ClO${}_4^{-}$

pH of a solution is 4. The hydroxide ion concentration of the solution would be

• 10^-4

• 10^-10

• 10^-2

• 10^-12

Heat of neutralisation of NH₄OH and HCl is

• equal to 13.7 kcal

• more than 13.7 kcal

• less than 13.7 kcal

• more than one is correct

20.

Which of the following relation is correct?

• $∆\mathrm{H} = ∆\mathrm{G} + \mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H} = -∆\mathrm{G} - \mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H} = ∆\mathrm{G} - \mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H} = -∆\mathrm{G} + \mathrm{T}∆\mathrm{S}$