Calculate the pOH of a solution at 250C that contains 1.0×10-6 M of hydronium ions .
7.00
4.00
9.00
1.00
Which of the following molecules acts as a Lewis acid ?
(CH3)3B
(CH3)2O
(CH3)3P
(CH3)3N
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
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
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 dissociation equilibrium of a gas AB2 can be represented as : 2AB2(g) 2AB(g) +B2(g).The degree of dissociation is 'x' and is small compared to 1.The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure p is
(2Kp/ p)
(2Kp / p)1/3
(2Kp / p)1/2
(Kp / p)
Which of the following statements about pH and H+ ion concentration is incorrect ?
addition of one drop of concentrated HCl 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 con.H2SO4 has lower H+ ion concentration than a dilute solution of H2SO4
Which of the following is most soluble ?
Bi2S3(KSP=1×10-70)
MnS(KSP=7×10-16)
CuS(KSP=8×10-37)
Ag2S(KSP=6×10-51)
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%
0.1 M solution of which one of these substances will be basic?
Sodium borate
Calcium nitrate
NH4Cl
Sodium sulphate
