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

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

693.

Calculate the number of H⁺ ions present in 1 mL of a solution whose pH is 10.

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

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

Which of the following acids has the smallest dissociation constant?

• CH₃CHFCOOH

• FCH₂CH₂COOH

• BrCH₂CH₂COOH

• CH₃CHBrCOOH

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

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

• temperature and pressure

• temperature only

• pressure only

• temperature, pressure and catalyst

The pair of compound which cannot exists together in solution is

• NaHCO₃ and NaOH

• Na₂CO₃ and NHCO₃

• Na₂CO₃ and NaOH

• NaHCO₃ and NaCl

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.