31.

For a reaction, r= k(CH₃COCH₃)^3/2 then unit of rate of reaction and rate constant respectively is

• mol L-¹ s-¹, mol^-1/2 L^1/2 s-1

• mol^-1 L-¹ s^-1, mol^-1/2 L^-1/2 s^-1

• mol L-1 s^-1 mol^+1/2L^1/2s^-1

• mol L s, mol^+1/2 L ^1/2 s

For Zn²⁺| Zn, ${\mathrm{E}}^{\circ }$= -0.76 then EMF of the cell Zn/Zn²⁺(+1M)|2H⁺ (1M)| H₂(1 atm) will be

• -0.76 V

• 0.76 V

• 0.38 V

• -0.38 V

If t_1/2  vs  $\frac{1}{{\mathrm{a}}^2}$ is a straight line graph then determine the order of reaction.

• Zero order

• First order

• Second order

• Third order

CsCl has bcc arrangement. Its unit cell edge length is 400 pm. Its inter-ionic distance is

• 400 pm

• 800 pm

• $\sqrt{3 }$$\times$100 pm

• $\frac{\sqrt{3}}{2}\times 400 \mathrm{pm}$

A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called

• Tyndall effect

• Brownian effect

• Hardy- Schulze effect

• none of these

Magnetic moment of Cr²⁺ is nearest to

• Fe²⁺

• Mn²⁺

• Co²⁺

• Ni²⁺

Which will not form precipitation after addition of (NH₄)₂CO₃ in presence of NH₄Cl?

• Mg

• Ba

• Sn

• Sr

Difference in atomic radius is maximum for

• Rb-Cs

• K-Rb

• Na-K

• Li-Na

Which is correct order of solubility in water?

• Ba(OH)₂ <Mg(OH)₂

• BaCO₃> CaCO₃

• CaSO₄ <MgSO₄

• Ca(OH)₂$\simeq$Mg(OH)₂

Assertion : Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction.

Reason : Rate constant also doubles.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.