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41) Basicity of an acid is defined as number of replicable:
a) OH groups in its molecule.
b) H atom in its molecule.
c) non-metal cations in its molecule.
d) non-metal anions in its molecule.
ANSWER : H atom in its molecule.
42) NH3 and H20 can act as:
a) Lewis acid and Bronsted base.
b) Lewis base and Bronsted acid
c) Lewis and Bronsted base.
d) Lewis and Bronsted acid.
ANSWER : Lewis and Bronsted base.
43) What will be the pH of a buffer solution formed by dissolving equal
number of moles of HOCl (ka = 4.3 x 10-8) and NaOH?
a) 7.0
b) 3.2
c) 7.3
d) 4.5
ANSWER : 7.3
44) A buffer solution is one that contains:
a) a weak acid and its conjugate base.
b) strong base and its conjugate acid
c) strong acid and its conjugate base.
d) none of these.
ANSWER : a weak acid and its conjugate base.
45) When 40ml of N / 40 KOH are added to 30ml of N / 30 then the resulting
solution will be:
a) Acidic
b) Neutral
c) Basic
d) None of these.
ANSWER : Neutral
46) In order to lower the pH of water, salt of ……………. should be added to it.
a) Weak acid and strong base.
b) Weak acid and weak base.
c) Strong acid and strong base.
d) Strong acid and weak base.
ANSWER : Strong acid and weak base.
47) Aqueous solution of Na2CO3 is alkaline because:
a) it is basic in nature.
b) it is acidic in nature.
c) of its anionic hydrolysis of salt of strong acid and strong base.
d) of its anionic hydrolysis of salt of weak acid and strong base.
ANSWER : of its anionic hydrolysis of salt of weak acid and strong base.
48) Addition of a salt of weak acid and strong base to water would cause:
a) increase in pH.
b) pH remains same.
c) decrease in pH.
d) none of these.
ANSWER : increase in pH.
49) The dissociation constant of acetic acid is 1.8 x 10-5. .
0.5M sodium acetate and 5M acetic acid solutions are mixed. What will be the pH
of the mixture (log1.8 = 0.20)
a) 3.6
b) 3.8
c) 5.9
d) 5.5
ANSWER : 3.8
50) Among the following which is a strong electrolyte and thus the best
conductor of electricity?
a) Sulphuric acid
b) Acetic acid
c) Boric acid
d) Phosphoric acids
ANSWER : Sulphuric acid
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