Assertion : The second dissociation constant of fumaric acid is greater than maleic acid.

Reason : Higher the dissociation constant of acid, more is the acidic character.

• 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

552.

NO₂ (brown colour gas) exists in equilibrium with N₂O₄ (colourless gas) as given by chemical equation.

$\underset{\left(\mathrm{brown}\right)}{2{\mathrm{NO}}_2} \rightleftharpoons \underset{\left(\mathrm{colourless}\right)}{{\mathrm{N}}_2{\mathrm{O}}_4}$

Mixture is slightly brown due to existence of NO₂. If pressure is increased :

• colour intensity is increased

• colour intensity is decreased

• colour intensity first increases and then decreases

• No change in colour intensity

K_P for the reaction A $\rightleftharpoons$ B is 4. If initially only A is present then what will be the partial pressure of B after equilibrium?

• 1.2

• 0.8

• 0.6

• 1

0.1 M solution of CH₃COOH should be diluted to how many times so that pH is doubled ?

• 4.0 times

• 5.55 x 10⁴ times

• 5.55 x 10⁶ times

• 10^-2 times

If the equilibrium constant of the reaction of weak acid HA with strong base is 10⁹ then pH of 0.l M NaA is :

• 5

• 9

• 7

• 8

Which of the following compounds is the weakest Bronsted base ?

The true statement for the acids of phosphorus, H₃PO₂ H₃PO₃ and H₃PO₄ is

• the order of their acidity is H₃PO₄ > H₃PO₃ > H₃PO₂

• all of them are reducing in nature

• all of them are tribasic acids

• the geometry of phosphorus is tetrahedral in all the three.

Assertion : H₃BO₃ is a weak acid.

Reason : Water extracts the proton of H₃BO₃.

• 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 ionisation percentage of 0.2 M HCN the solution is 0.02%. What will be the value of ionisation constant ?

• 8 x 10^-5

• 8 x 10^-9

• 8 x 10^-7 

• 8 x 10^-3

Which one act as Bronsted acid as well as Bronsted base?

• Cl^-

• OH^-

• HCl

• H₂O