581.

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

• $\frac{1}{\mathrm{RT}}$

• $\frac{1}{\sqrt{\mathrm{RT}}}$

• $\frac{\mathrm{RT}}{2}$

At 60° and 1 atm, N₂O₄ is 50% dissociated into NO₂ then K_P is

• 1.33 atm

• 2 atm

• 2.67 atm

• 3 atm

pK_a increases in benzoic acid when substituent "x" is bonded at para-position, then "x" is

• -COOH

• -NO₂

• -CN

• -OCH₃

What will be the solubility product of AX₃?

• 27S⁴

• 4S³

• 36S⁴

• 9S³

Assertion : Aqueous solution of CoCl₂ is pink in colour. It turns blue in presence of conc. HCl.

Reason : It is due to the formation of [CoCl₄]^2-.

• 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.

The concentration of Ag⁺ ion in a given saturated solution of AgCl at 25°C is 1.06 x 10^-5 g ion L^-1 .Thus , the solubility product of AgCl is :

• 0.453 x 10^-10

• 0.530 x 10^-10

• 1.12 x 10^-10

• 2.12 x 10^-10

Solution of 0.l N NH₄OH and 0.1 N NH₄Cl has pH 9.25. Then , pK_b of NH₄OH is :

• 9.75

• 4.75

• 3.75

• 8.25