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 conjugate acid of is
N2H4
NH2OH
NH3
The pH value of blood does not change appreciably by a small addition of an acid or base, because the blood
is a body fluid
can be easily coagulated
contains iron as a part of the molecule
contains serum protein that acts as buffer
Which has highest pH ?
CH3COOK
Na2CO3
NH4CI
NaNO3
0.1 M solution of which one of these substances will be basic ?
Sodium borate
Calcium nitrate
Sodium sulphate
In which of the following the solubility of AgCI will be minimum ?
0.1 M NaNO3
Water
0.1 M NaCI
0.1 M NaBr
The pH value of a 10 M solution of HCI 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 HCI with 30.0 mL of 0.10 M Ba(OH)2 ?
0.10 M
0.40 M
0.0050 M
0.12 M
Solution of 0.1 NH4OH and 0.1 N NH4CI has pH 9.25, then find out pKb of NH4OH
9.25
4.75
3.75
8.25
Which of the following pairs constitutes a buffer ?
HNO2 and NaNO2
NaOH and NaCI
HNO3 and NH4NO3
HCI and KCI
