CBSE
Multiple Choice QuestionsIn a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will:
also be doubled
be halved
remains the same
becomes one-fourth
A 100 mL 0.1 = (M) solution of ammonium acetate is diluted by adding 100 mL of water. The pH of the resulting solution will be (pKa of acetic acid is nearly equal to pKb of NH4OH).
4.9
5.0
7.0
10.0
In which of the following reaction Kp> Kc ?
Assertion: Relative strength of acids can be known by knowing the value of dissociation constant.
Reason : It gives the value of H dissolved in solution.
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 Assertion is false but Reason is true.
A solution with pH = 2 is more acidic than one with a pH =6, by a factor of
4000
5000
8000
10,000
The equivalent weight of K2Cr2O7 in acidic medium is expressed in terms of its molecular weight (M) as:
M/3
M/4
M/6
M/7
The equilibrium constant of a reaction is 300. If the volume of a reaction flask is trippled, the equilibrium constant will be
300
100
600
150
Which of the following is a characteristic of a reversible reaction?
It never proceeds to completion
It can be influenced by a catalyst
It proceeds only in forward direction
Number of moles of reactants and products are equal.
Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is
I. H3N+-CH(CH3)CO2H
II. H2N-CH(CH3)CO
III. H3N+-CH(CH3)CO
IV.H2N-CH(CH3)CO2H
I and II
I and III
II and III
III and IV
The ratio of volumes of CH3COOH 0.1 (N) to CH3COONa 0.1 (N) required to prepare a buffer solution of pH 5.74 is (Given pKa of CH3COOH is 4.74)
10 : 1
5 : 1
1 : 5
1 : 10
