21.

If molecular weight of KMnO₄ is M, then its equivalent weight in acidic medium would be

• M

• M/2

• M/5

• M/3

In the reaction $3\mathrm{A} + 2\mathrm{B} \to 2\mathrm{C}$, the equilibrium constant K_c is given by

• $\frac{\left[3\mathrm{A}\right] \mathrm{x}\left[2\mathrm{B}\right]}{\left[\mathrm{C}\right]}$

• $\frac{[\mathrm{A}{]}^3\times [\mathrm{B}]}{\left[\mathrm{C}\right]}$

• $\frac{[\mathrm{C}{]}^2}{[\mathrm{A}{]}^3\times [\mathrm{B}{]}^2}$

• $\frac{\left[\mathrm{C}\right]}{\left[3\mathrm{A}\right]\left[2\mathrm{B}\right]}$

20 volume H₂O₂ solution has a strenght of about

• 30%

• 6%

• 3%

• 10%

N₂ and H₂ in 1 : 3 molar ratio are heated in a closed container having a catalyst. When the following equilibrium ${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right) \rightleftharpoons 2{\mathrm{NH}}_3\left(\mathrm{g}\right)$ is attained, the total pressure is 10 atm and mole fraction of NH₃ is 0.60. The equilibrium constant K_P for dissociation of NH₃ is

• 1.333 atm^-2

• 0.75 atm^-2

• 0.75 atm²

• 1.333 atm²

According to Le-Chatelier principle, adding heat a solid and liquid in equilibrium will cause the

• amount of solid to decrease

• amount of liquid to decrease

• temperature to rise

• temperature to fall

Dalton's law of partial pressure is not applicable to

• O₂+ O₃

• CO + CO₂

• NH₃+ HCl

• I +O₂

Positive deviation from ideal behaviour takes place because of

• molecular interaction between atom and $\frac{\mathrm{PV}}{\mathrm{nRT}}>1$

• molecular interaction between atom and $\frac{\mathrm{PV}}{\mathrm{nRT}}<1$

• finite size of atoms and $\frac{\mathrm{PV}}{\mathrm{nRT}}>1$

• finite size of atoms and $\frac{\mathrm{PV}}{\mathrm{nRT}}<1$

Solubility of AgCl at 20$°$C is 1.435 x 10^-3 g/L. The solubility product of AgCl is

• 1 x 10^-5

• 1 x 10^-10

• 1.435 x 10^-5

• 108 x10^-3

At 30$°$C the solubility of Ag₂CO₃ (K_sp=8 x 10^-12) would be greatest in one litre of 

• 0.05 M Na₂CO₃

• 0.05 M AgNO₃

• pure water

• 0.05 N NH₃

Which of the following can behave as an acid as well as base ?

• HCl

• H₂SO₄

• H₂O

• NH₃