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21) Which of the following act as Bronsted acid?
a) HSO3-
b) HCO3-
c) Both a and b
d) None.
ANSWER : Both a and b
22) An acid is one that donates a proton. This theory was given by:
a) Lewis
b) Lowery – Bronsted
c) Arrhenius
d) Ostwald.
ANSWER : Lowery – Bronsted
23) Zn (OH) 2 is a:
a) strong base
b) strong acid
c) weak acid
d) weak base.
ANSWER : weak acid
24) Aprotic solvent is one which:
a) donates a proton.
b) accepts a proton.
c) donates a proton and accepts a proton.
d) neither donates a proton nor accepts a proton.
ANSWER : neither donates a proton nor accepts a proton.
25) If the degree of dissociation is less than 1 then it is a:
a) weak electrolyte.
b) strong electrolyte.
c) strong base.
d) none of these.
ANSWER : weak electrolyte.
26) At 70°C pure water has (H30+) = 10-8 mol
/ lit, the value of Kw at 90°C is:
a) 10-6
b) 10-12
c) 10-14
d) 10-16.
ANSWER : 10-16.
27) NH4Cl and aq.NH3 will precipitate. a) Cu2+
b) Fe3+ c) Na+ d) K+ ANSWER : Fe3+
28) 10-4 M HCl solution at 298 K is diluted 1000 times. The pH of
the solution will:
a) Lie between 8 and 9.
b) Remain unchanged.
c) Lie between 6 and 7.
d) Equal to 7.
ANSWER : Lie between 6 and 7.
29) The (H3O+) ion concentration of a solution is 7.2
x 10-9 mol / lit. its pH would be:
a) 8.14
b) 6.81
c) 7.41
d) 5.79
ANSWER : 8.14
30) The conjugate base of methyl alcohol is:
a) hydroxyl ion.
b) methyl radical.
c) hydronium ion.
d) methoxide ion.
ANSWER : methoxide ion.
Part 1
Part 2 Part 3
Part 4
Part 5
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