CBSE
Multiple Choice QuestionsIn an exothermic equilibrium ,
A + 3B AB3
all the reactants and products are in gaseous state. The formation of AB3 is favoured at :
low temperature and low pressure
low temperature and high pressure
high temperature and high pressure
high temperature and low pressure
If in the reaction N2O4 2NO2 , x is that part of N2O4 which dissociates, then the number of molecules at equilibrium will be :
1
3
(1 + X)
(1 + X)2
For the reaction, H2 + I2 2HI, K = 47.6. If the initial number of moles of each reactant and product is 1 mole then at equilibrium
[I2] = [H2] , [I2] > [HI]
[I2] = [H2] , [I2] < [HI]
[I2] < [H2] , [I2] = [HI]
[I2] > [H2] , [I2] = [HI]
H3PO3 is
dibasic acid
basic
tribasic acid
neutral
The species among the following, which can act as an acid and a base is :
HS
S
H3O+
Cl-
If Kb of HCN is 4.0 10-10, then the pH of 2.5 10-1 molar aqueous HCN is
2.0
4.7
5.0
2 x 10-5
4.0 g molecular PCl5 were heated in a vessel of 6 L volume. At equilibrium state , 50% of PCl5 is dissociated. The equilibrium constant for the reaction is :
0.66 mol L-1
0.33 mol L-1
0.44 mol L-1
0.88 mol L-1
For a chemical reaction, temperature is raised from 25° C to 35° C. The value of equilibrium constant, Kp is doubled . The heat of reaction (H) for the reaction will be :
13.834 kcal
11.714 kcal
10.726 kcal
4.312 kcal
The pH of blood is :
greater than 10
less than 6
greater than 7 and less than 8
greater than 8 and less than 9
A precipitate of AgCl is formed when equal volumes of the following are mixed :
[Ksp for AgCl = 10-10]
10-4 M AgNO3 and 10-7 M HCl
10-5 M AgNO3 and 10-6 M HCl
10-5 M AgNO3 and 10-4 M HCl
10-6 M AgNO3 and 10-6 M HCl
