Which of the following statements about pH and H+ ion concentration is correct ?
Addition of one drop of concentrated HCI in NH4OH solution decreases pH of the solution
A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
pH of pure neutral water is not zero
A cold and conc H2SO4 has lower H+ ion concentration than a dilute solution of H2SO4
At 25o C, the dissociation constant of a base, BOH is 1.0 × 10-12 . The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
2.0 × 10-6 mol L-1
1.0 × 10-5 mol L-1
1.0 × 10-6 mol L-1
1.0 × 10-7 mol L-1
Equal volumes of three acid solutions of pH 3,4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture ?
1.11 × 10-4 M
3.7 × 10-4 M
3.7 × 10-3 M
1.11 × 10-3 M
Aqueous solution of acetic acid contains
CH3COO- and H+
CH3COO- , H3 O+ and CH3COOH
CH3COO-, H3O+ and H+
CH3COOH, CH3COO- and H+
The strongest conjugate base is
CI-
CH3COO-
The solubility of a saturated solution of calcium fluoride is 2 × 10-4 mol/L. Its solubility product is
12 × 10-2
14 × 10-4
22 × 10-11
32 × 10-12
Which of the following molecules act as a Lewis acid ?
(CH3 )3 B
(CH3 )2 O
(CH3 )3 P
(CH3 )3 N
A weak acid, HA, has a Ka of 1.00 × 10-5 . If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
99.0%
1.00 %
99.9 %
0.100 %
The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (HIn) and base (In- ) forms of the indicator given by the expression
In which of the following the solubility of AgCI will be minimum ?
0.1 M NaNO3
Water
0.1 M NaCI
0.1 M NaBr
