Which of the following is not a buffer solution?

• 100 mL 0.1 M CH₃COOH+ 50 mL 0.1 M CH₃COONa

• 100 mL 0.1 M CH₃COOH+ 50 mL 0.1 M  NaOH

• 50 mL 0.1 M CH₃COOH+ 100 mL 0.1 M  NaOH

• 100 mL 0.1 M NH₄OH+ 50 mL 0.1 M  HCl

262.

If K_sp Of Ag₂S is 10^-17, the solubility of Ag₂S in 0.1 M solution of Na₂S will be

• 10^-8

• 5 × 10^-9

• 10^-15

• 10^-16

The pH values of 0.1 M solution of HCl, CH₃COOH, NH₄Cl and CH₃COONa will have the order

• HCl <CH₃COOH < NH₄Cl <CH₃COONa 

• CH₃COONa <NH₄Cl<CH₃COOH <HCl

• NH₄Cl <CH₃COONa <CH₃COOH <HCl

• All will have same pH value

For the titration of solution of oxalic acid and sodium hydroxide, the suitable indicator is

• phenolphthalein

• methyl orange

• any of these

• None of these

Consider the two gaseous equilibria involving SO₂ and the corresponding equilibrium constants at 298 K

SO₂ (g) + $\frac{1}{2}$O₂ (g) $\rightleftharpoons$ SO₃ (g); K₁

2SO₃ (g) $\rightleftharpoons$ 2SO₂ (g) + O₂ (g); K₂

The values of the equilibrium constants are related by

• K₂ = K₁

• K₂ = K${}_1^2$

• K₂ = $\frac{1}{{\mathrm{K}}_1^2}$

• K₂ = $\frac{1}{{\mathrm{K}}_1}$

For the reaction,

A + B $\rightleftharpoons$ C + D,

the initial concentrations of A and B are equal. The equilibrium concentration of C is two times the equilibrium concentration of A. The equilibrium constant is

• 4

• $\frac{1}{4}$

• 9

• $\frac{1}{9}$

The pOH of a solution is 6.0. Its pH will be

• 6

• 8

• 0

• 14

Solubility products of Al(OH)₃ and Zn(OH)₂ are 8.5 × 10^-23 and 1.8 × 10^-4 respectively. If both Al³⁺ and Zn²⁺ ions are present in a solution, which one will be precipitated first on addition of NH₄OH?

• Al(OH)₃

• Zn(OH)₂

• Both (a) and (b)

• None of these

The weakest acid among the following is

• CH₃COOH

• CH₂ClCOOH

• CHCl₂COOH

• CCl₃COOH

Nitric acid ionises slightly in HF,

$\underset{\left(\mathrm{Solvent}\right)}{{\mathrm{HNO}}_3 + \mathrm{HF} \rightleftharpoons {\mathrm{H}}_2{\mathrm{NO}}_3^{+} + {\mathrm{F}}^{-}}$ Then.

• HNO₃ and H₂NO${}_3^{+}$

• HF and F^- are bases

• HNO₃ and F^- are bases

• only HNO₃ is base