911.

Assertion : Mixture of CH₃COOH and CH₃COONH₄ is an example of acidic buffer.

Reason: Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.

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

• If both aaertion 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.

Conjugate acid of CH₃NH₂ is :

• CH₃OH

• CH₃NH₃⁺

• CH₂NH₂⁺

• CH₃N^-H

Which one of the following aqueous solutions of salts has the lowest pH value ?

• CH₃COONa

• NaCl

• NH₄OOCCH₃

• NH₄Cl

At equilibrium which is correct?

• $\text{∆}$G = 0

• $\text{∆}$S = 0

• $\text{∆}$H = 0

•  $\text{∆}$${\text{G}}^{°}$= 0

If the solubility of PbCl₂ at 25°C is 6.3 x 10^-2 mol/L , its solubility product is :

• 1 x 10^-6

• 1 x 10^-3

• 1.1 x 10^-6

• 1.1 x 10^-5

Which of the following is most basic?

• Al(OH)₃

• Cr(OH)₃

• La(OH)₃

• Fe(OH)₃

Which has the highest pH?

• CH₃COOK

• Na₂CO₃

• NH₄Cl

• NaNO₃

pH of a solution can be expressed as :

• -log_e [H⁺]

• -log₁₀ [H⁺]

• log_e [H⁺]

• log₁₀[H⁺]

K₂Cr₂O₇ in acidic medium converts into

• Cr²⁺

• Cr³⁺

• Cr⁴⁺

• Cr⁵⁺

$\frac{{\mathrm{K}}_{\mathrm{p}}}{{\mathrm{K}}_{\mathrm{c}}}$ for following reaction will be ${\mathrm{CO}}_{\left(\mathrm{g}\right)}+\frac{1}{2} {\mathrm{O}}_{2\left(\mathrm{g}\right)}\to {\mathrm{CO}}_{2\left(\mathrm{g}\right)}$.

• RT

• $\frac{1}{\mathrm{RT}}$

• $\frac{1}{\sqrt{\mathrm{RT}}}$

• $\frac{\mathrm{RT}}{2}$