Aqueous solution of acetic acid contains
CH3COO- and H+
CH3COO- , H3 O+ and CH3COOH
CH3COO-, H3O+ and H+
CH3COOH, CH3COO- and H+
The solubility product of AgI at 25o C is 1.0 × 10-16 mol2 L-2. The solubility of AgI in 10-4 N solution of KI at 25oC is approximately (in mol L-1)
1.0 × 10-10
1.0 × 10-8
1.0 × 10-16
1.0 × 10-12
Which of the following is most soluble ?
Bi2S3 (Ksp = 1 × 10-70 )
MnS (Ksp = 7 × 10-16 )
CuS (Ksp = 8 × 10-37 )
Ag2S (Ksp = 6 × 10-51 )
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
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 %
0.1 M solution of which one of these substances will be basic ?
Sodium borate
Calcium nitrate
NH4CI
Sodium sulphate
Which one of the following is true for any diprotic acid, H2 X ?
H2S gas when passed through a solution of cations containing HCI precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is because
presence of HCI decreases the sulphide ion concentration
presence of HCI increases the sulphide ion concentration
solubility product of group II sulphides is more than that of group IV sulphides
sulphides of group IV cations are unstable in HCI
The solubility product of CuS, CdS and HgS are 10-31 , 10-44 ,10-54 respectively. The solubility of these sulphides are in the order.
CdS > HgS > CuS
HgS > CdS > CuS
CdS > CuS > HgS
CuS > CdS > HgS
The hydride ion H- is stronger base that its hydroxide ion OH-. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water ?
2H- (aq) + H2 O(l) → H2 O + H2 + 2e-
H- (aq) + H2 O(l) → OH- + H2
H- + H2 O(l) → no reaction
None of the above