CBSE
Multiple Choice QuestionsFor a given exothermic reaction Kp and Kp' are the equilibrium constant at temperatures T1 and T2 respectively. Assuming that heat of reaction si constant in temperature range between T1 and T2 it is readily observed that
Kp> Kp'
Kp< Kp'
Kp = Kp'
Kp = Kp'
Which one of the following characteristics is associated with adsorption?
ΔG, ΔH and ΔS all are negative
ΔG and ΔH are negative but ΔS is positive
ΔG and ΔS are negative but ΔH is positive
ΔG and ΔS are negative but ΔH is positive
If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains
all reactants
mostly reactants
mostly products
mostly products
The addition of a catalyst during a chemical reaction alters which of the following quantities ?
Internal energy
Enthalpy
Activation energy
Activation energy
MY and NY3, two nearly insoluble salts. have the same Ksp values of 6.2 x 10-13 at room temperature. Which statement would be true in regard to MY and NY3 ?
The molar solubility of MY in water is less than that of NY3
The salts MY and NY3 are more soluble in 0.5 M KY than in pure water
The addition of the Salt of KY to the solution of MY and NY3 will have no effect on their solubilities.
The addition of the Salt of KY to the solution of MY and NY3 will have no effect on their solubilities.
The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-11, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?
AgI
AgCl
AgBr
AgBr
For the reversible reaction,
the equilibrium shifts in the forward direction
by increasing the concentration of NH3 (g)
by decreasing the pressure
by decreasing the concentrations of N2 (g) and H2(g)
by decreasing the concentrations of N2 (g) and H2(g)
Which of these is least likely to act as a lewis base?
CO
F-
BF3
BF3
Which of the following salts will give highest pH in water?
KCl
NaCl
Na2CO3
Na2CO3
Consider the following liquid-vapour equilibrium
Which of the following relations is correct?
