The ionisation percentage of 0.2 M HCN the solution is 0.02%. Wha

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 Multiple Choice QuestionsMultiple Choice Questions

551.

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.

2NO2(brown)  N2O4(colourless)

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


553.

KP for the reaction A  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


554.

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


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555.

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


556.

Which of the following compounds is the weakest Bronsted base ?


557.

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.


558.

Assertion : H3BOis 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.


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559.

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


A.

8 x 10-5

Kh = Cα2 = 0.2 x (0.02)4

= 0.2 X 0.0004

= 8 x 10-5


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560.

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

  • Cl-

  • OH-

  • HCl

  • H2O


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