Which of the following acids has the smallest dissociation consta

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 Multiple Choice QuestionsMultiple Choice Questions

691.

A weak acid of dissociation constant 10-5 is being titrated with aqueous NaOH solution. The pH at the point of one-third neutralisation of the acid will be

  • 5 + log 2 - log 3

  • 5 - log 2

  • 5 - log 3

  • 5 - log 6


 Multiple Choice QuestionsShort Answer Type

692.

Considering the first dissociation which is more acidic and why -fumaric acid and maleic acid?


693.

Calculate the number of Hions present in 1 mL of a solution whose pH is 10.


 Multiple Choice QuestionsMultiple Choice Questions

694.

Addition of sodium acetate to 0.1 M acetic acid will cause

  • increase in pH

  • decrease in pH

  • no change in pH

  • change in pH that cannot be predicted


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695.

A catalyst is a substance which

  • increases the equilibrium constant of the reaction

  • increases equilibrium concentration of products

  • does not alter the reaction mechanism

  • changes the activation energy of the reaction


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696.

Which of the following acids has the smallest dissociation constant?

  • CH3CHFCOOH

  • FCH2CH2COOH

  • BrCH2CH2COOH

  • CH3CHBrCOOH


C.

BrCH2CH2COOH

Group or atom attached with -COOH group shows negative inductive effect, makes the acid stronger or acid has the larger dissociation constant.

-Br shows poor negative inductive effect and also it is far away from -COOH, which makes BrCH2CH2COOH weakest acid and hence, it has smallest dissociation constant.


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697.

A liquid is in equilibrium with its vapour at it's boiling point. On the average, the molecules in two phases have equal

  • inter- molecular forces

  • potential energy

  • kinetic energy

  • total energy


698.

For the chemical reaction 3X(g)+ Y(g) X3Y (g), the amount of X3Y at equilibrium is affected by

  • temperature and pressure

  • temperature only

  • pressure only

  • temperature, pressure and catalyst


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699.

The pair of compound which cannot exists together in solution is

  • NaHCO3 and NaOH

  • Na2CO3 and NHCO3

  • Na2CO3 and NaOH

  • NaHCO3 and NaCl


700.

In homogeneous catalysis

  • the reactants, catalyst and products are in the same phase.

  • the catalyst and reactants are in the same phase.

  • the catalyst and products are in the same phase.

  • the reactants and products are in the same phase.


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