H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is because
Presence of HCl decreases the sulphide ion concentration.
Presence of HCl increases the sulphide ion concentration.
Solubility product of group 2nd sulphides is more than that of group iv silphides
Sulphides of group iv cations are unstable in HCl
Which of the following pairs constitutes a buffer ?
HNO2 and NaNO2
NaOH and NaCl
HNO3 and NH4NO3
HCl and KCl
The solubility product of AgI at 250C is 1.0 ×10-16 mol2L-2.The solubility of AgI in 10-4 N solution of KI at 250C is approximately (in mol L-1)
1.0 ×10-10
1.0 ×10-8
1.0 ×10-16
1.0 ×10-12
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
0.1 M solution of which one of these substances will be basic ?
Sodium borate
Calcium nitrate
NH4Cl
Sodium sulphate
The Strongest conjugate base is ____ .
NO3-
Cl-
SO4 2-
CH3COO-
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%
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
The pH value of a 10 m solution of HCl is _________ .
less than 0
Equal to 0
Equal to 1
Equal to 2
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?
0.10 M
0.40 M
0.0050 M
0.12 M
