What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCI with 30.0 mL of 0.10 M Ba(OH)2 ?
0.10 M
0.40 M
0.0050 M
0.12 M
Which of the following molecules act as a Lewis acid ?
(CH3 )3 B
(CH3 )2 O
(CH3 )3 P
(CH3 )3 N
What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1 ), sodium sulphide (pH2 ), sodium selenide (pH3) and sodium telluride (pH4) ?
pH1 > pH2 pH3 > pH4
pH1 < pH2 < pH3 < pH4
pH1 < pH2 < pH3 pH4
pH1 > pH2 > pH3 > pH4
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
The ionisation constant of ammonium hydroxide is 1.77 × 10-5 at 298 K. Hydrolysis constant of ammonium chloride is
5.65 × 10-10
6.50 × 10-12
5.65 × 10-13
5.65 × 10-12
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
Aqueous solution of acetic acid contains
CH3COO- and H+
CH3COO- , H3 O+ and CH3COOH
CH3COO-, H3O+ and H+
CH3COOH, CH3COO- and H+
Which has highest pH ?
CH3COOK
Na2CO3
NH4CI
NaNO3
A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resist changes in pH yet contains only small concentration of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use ?
m-chlorobenzoic acid (pKa =3.98)
p-chlorocinnamic acid (pKa = 4.41)
2, 5 - dihydroxy benzoic acid (pKa = 2.97)
Acetoacetic acid (pKa = 3.58)
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)
