The strongest conjugate base is
NO3-
Cl-
SO4 2-
CH3COO-
The solubility product of a sparingly soluble salt AX2 is 3.2 ×10-11. Its solubility ( in mol / L ) is
5.6 ×10-6
3.1 ×10-4
2 ×10-4
4 ×10-4
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)
Which of the following molecules acts as a Lewis acid ?
(CH3)3B
(CH3)2O
(CH3)3P
(CH3)3N
Which one of the following is true for any diprotic acid H2X?
Ka2=Ka1
Ka2>Ka1
Ka2< Ka1
Ka2= 1 / Ka1
The conjugate acid of NH2- is
N2H4
NH4 +
NH2 OH
NH3
In which of the following the solubility of AgCl will be minimum ?
0.1 m NaNO3
Water
0.1 m NaCl
0.1 m NaBr
0.1 M solution of which one of these substances will be basic ?
Sodium borate
Calcium nitrate
NH4Cl
Sodium sulphate
Which has highest pH ?
CH3COOK
Na2CO3
NaNO3
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
