Test #1
Name of Student ________________ Class : XI
Q.1 Explain the following term
i )Reversible
reaction ii) Equilibrium constant
iii) Solubility product iv) Law of Mass Action
v) Le- Chatelier principle
Q.2 How is Kc
used to predict the direction of a reversible reaction?
Q.3 In chemical reaction PCl5 ↔
PCl3 +
Cl2
Calculate the mole of chlorine
produce at equilibrium when 1 mole of PCl5 is heated at 2500c
in a vessel of capacity 10 dm3 (Kc for the reaction is 0 .041)
Q.4 5 moles of acetic acid and 1.5 moles
of ethyl alcohol were reacted at a certain temperature. At equilibrium, 1 mole
of ethyl acetate was present in 1 dm3 of the equilibrium mixture.
Calculate the equilibrium constant Kc.
CH3COOH + C2H5OH ↔ CH3COOC2H5 + H2O
CH3COOH + C2H5OH ↔ CH3COOC2H5 + H2O
Test #2
Name of Student ________________ Class
:XI
Q.1 State and explain Law of Mass Action and
derive the equilibrium constant
expression for the general equilibrium reaction :
mA + nB
↔ xC +
yD
Q.2 For reaction
N2 + 3H2
↔= 2NH3
The equilibrium mixture contain .25 M nitrogen .15 M
hydrogen gas at 250 c. Calculate the concentration of NH3
gas when Kc =9.6 .The volume of the container is 1dm3.
Q.3 For the
reaction H2 + I2
↔ 2HI
Kc is 49 . Calculate the concentration of HI at
equilibrium when initial one mole of H2 is mixed with
one more of I2 in one
liter flask .
Q.4 The
solubility of Mg(OH)2 at 25°C is 0.00764 gm/dm3.
What is the solubility product of Mg(OH)2? Mg(OH)2 ↔ Mg++ +
2OH-
Test #3
Name of Student ________________ Class :XI
Q.1State and explain Le-Chatlelier principle. Discuss the
condition to increase
the yield of NH3 in
Haber’s process.
Q.2
Will PbCrO4 precipitate from a solution prepared by mixing 200 cm3
of 2.5 x 10-4 M Pb(NO3)2 and 600 cm3
of 1.5 x 10-8 M of K2CrO4? (K(sp) of PbCrO4 = 1.5
x 10-14 )
Q.3 The
equilibrium constant for the reaction
N2 + O2 ↔ 2NO
at 20000C is 0.1.
Calculate the equilibrium concentration of the reactants and product when the
initial concentration of N2 and O2 are 10 mole/dm3
Q.4 At a certain temperature, an equilibrium mixture
contains 0.4 mole H2, 0.4 mole I2 and 1 mole of HI. The
volume of the reacting vessel is 4 dm3. Find out the equilibrium
constant Kc.
H2 + I2 ↔ 2HI
H2 + I2 ↔ 2HI
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