CBSE
Short Answer TypeConsidering the first dissociation which is more acidic and why -fumaric acid and maleic acid?
Multiple Choice QuestionsFor a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?
The backward reaction has higher activation energy than the forward reaction.
The backward and the forward processes have the same activation energy.
The backward reaction has lower activation energy
No activation energy is required at all since energy is liberated in the process.
Under which of the following conditions is the relation valid for a closed system ?
Constant pressure
Constant temperature
Constant temperature and pressure
Constant temperature, pressure and composition
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 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
0.1M HCl and 0.1M H2SO4 each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is
1.17
1.0
0.3
log 2 - log 3
Which of the following acids has the smallest dissociation constant?
CH3CHFCOOH
FCH2CH2COOH
BrCH2CH2COOH
CH3CHBrCOOH
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 will decrease the pH of a 50 mL solution of 0.01 M HCl?
Addition of 5 mL of 1 M HCl
Addition of 50 mL of 0.01 M HCl
Addition of 50 mL of 0.002 M HCl
Addition of Mg
Short Answer TypeCalculate the number of H+ ions present in 1 mL of a solution whose pH is 10.
