CBSE
Multiple Choice QuestionsThe pH is less than 7, of the solution of :
FeCl3
NaCN
NaOH
NaCl
PCl5 was heated in a 10 dm3 container at 250°C
PCl5(g) PCl3(g) + Cl2 (g)
0.1 mol PCl5 and 0.2 mol Cl2 was found at equilibrium. The equilibrium constant for the reaction is :
0.025
0.04
0.02
0.05
The solubility of CuBr is 2 x 10-4 mol/L at 25°C. The KSP value for CuBr is :
4 x 10-8 mol2 L-2
4 x 10-4 mol2 L-2
4 x 10-11 mol2 L-2
4 x 10-15 mol2 L-2
The values of Ksp for CuS, Ag2S and HgS are 10-31, 1042, 10-54 respectively. The correct order of their solubility in water is :
AgS > HgS > CuS
HgS > Cus > Ag2S
HgS > Ag2S > Cus
Ag2S > CuS > HgS
At 80°C, distilled water has H+ ions concentration equal to 1 x 10-6 mole/litre. The value of KW at this temperature will be :
1 X 10-6
1 X 10-12
1 X 10-9
1 X 10-15
In the reaction,
H2SO4 + H2O H3O+ + HSO4-,
the conjugate acid of water is :
H3O+
H2O
HSO4-
SO42-
For a gaseous reaction,
C2H4 + H2 C2H6 ; H = -32.7 Kcal.
The concentration of C2H4 can be decreased by :
increasing pressure
increasing amount of H2
decreasing temperature
all of these
The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is :
(pKa for CH3COOH = 4.57)
4.09
6.09
5.09
7.09
pH of a solution of 10 mL 1N sodium acetate and 50 mL 2N acetic acid (Ka = 1.8 x 10-5), is approximately :
4
5
6
7
Dimethyl glyoxime gives a red precipitate with Ni2+, which is used for its detection. To get this precipitate readily the best pH range is
< 1
2-3
3- 4
9- 11
