The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be

• 2.0 × 10¹¹

• 4.0 × 10¹²

• 1.0 × 10²

• 1.0 × 10¹⁰

Which is the weakest acid out out of HF, HCl, HBr and HI?

• HF

• HCl

• HBr

• HI

Which of the following is a wrong statement about equilibrium state?

• Rate of forward reaction=Rate of backward reaction

• Equilibrium is dynamic

• Catalysts increase value of equilibrium constant

• Free energy change is zero

A + B $\rightleftharpoons$C + D. Initially moles of A and B are equal. At equilibrium, moles of C are three times that of A. The equilibrium constant of the reaction will be

• 1

• 3

• 4

• 9

$\mathrm{If} \mathrm{for} {\mathrm{N}}_2 + 3{\mathrm{H}}_2 \rightleftharpoons 2{\mathrm{NH}}_3, {\mathrm{K}}_{\mathrm{eq}} = 1.6 \times {10}^{-5},$ then the value of K_eq for the reaction ${\mathrm{NH}}_3 \rightleftharpoons \frac{1}{2}{\mathrm{N}}_2+ \frac{3}{2}{\mathrm{H}}_2 \mathrm{will} \mathrm{be}$

• 6.25

• 25

• 250

• 500

A weak acid HX has dissociation constant 10^-5. The pH of 0.1 M solution of this acid will be

• 2

• 3

• 4

• 5

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

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

599.

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