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
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 one of the following is true for any diprotic acid, H2 X ?
Calculate the pOH of a solution at 25oC that contains 1 ×10-10 M of hydronium ions.
7.00
4.00
9.00
1.00
The dissociation equilibrium of a gas AB2 can be represented as:
The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with eqilibrium constant Kp and total pressure p is
(2Kp / p)
(2Kp / p)1/3
(2Kp / p)1/2
(Kp / p)
Ionisation constant of CH3COOH is 1.7 × 10-5 and concentration of H+ ions is 3.4 × 10-4. Then, find out initial concentration of CH3COOH molecules.
3.4 × 10-4
3.4 × 10-3
6.8 × 10-4
6.8 × 10-3
Which of the following pairs constitutes a buffer ?
HNO2 and NaNO2
NaOH and NaCI
HNO3 and NH4NO3
HCI and KCI
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
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 hydrogen ion concentration of a 10-8 M HCI aqueous solution at 298 K (K = 10-14 ) is
1.0 × 10-6 M
1.0525 × 10-7 M
9.525 × 10-8 M
1.0 × 10-8 M
