CBSE
Multiple Choice QuestionsThe pH of 10-4M KOH solution will be
4
11
10.5
10
The solubility of Ca3(PO4)2 in water is y mol/L. Its solubility product is:
6y4
36y4
64y5
108y5
An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0), glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?
Glutamic acid migrates to anode at pH 6. Arginine is present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution
Glutamic acid migrates to cathode and others remain uniformly distributed in solution
All three remain uniformly distributed in solution
All three move to cathode
Which ofthese is least likely to act as a Lewis base?
CO
F-
BF3
PF3
The pH of an aqueous solution of CH3COONa of concentration C(M) is given by:
7 - 1/2 pKa - 1/2 log C
1/2 pKw + 1/2 pKb + 1/2 log C
1/2 pKw - 1/2 pKb - 1/2 log C
1/2 pKw - pKa + 1/2 log C
The equilibrium constant (K) of a reaction may be written as
20 mL 0.1 (N) acetic acid is mixed with 10 ml 0.l(N) solution of NaOH. The pH of the resulting solution is (pKb of acetic acid is 4.74)
3.74
4.74
5.74
6.74
If the molecular wt. of Na2S2O3 and I2 are M1 and M2 respectively then what will be the equivalent weight of Na2S2O3 and I2 in the following reaction?
2S2O32- + I2 S4O62- + 2I-
M1 , M2
M1 , M2/2
2M1 , M2
M1 , 2M2
If the equilibrium constants of the following equilibria,
SO2 + 1/2O2 SO3 and 2SO3 2SO2 + O2
are given by K1 and K2 respectively, which of the following relations is correct?
K2 = (1/K1)2
K1 = (1/K3)3
K2 = (1/K1)
K2 = (K1)2
-1
1
