Chemical Equilibirium
Subjective Question
Q.1 Discuss the conditions of
concentration , pressure and temperature in the presence of catalyst for
maximum yield of ammonia in the reaction
N2 + 3H2 ↔ 2NH3 ∆H
= Negative
Q.2 How is the equilibrium constant
value used to predict the extent of reaction ?
Q.3 Explain the term “ Solubility
Product” . What is the criterion for the precipitation from a solution?
Q. 4 Explain the following term
i )Reversible
reaction ii) Equilibrium constant
iii) Solubility product iv) Law of Mass Action
v) Le- Chatelier principle
Q.5 State and explain Law of Mass Action.
Q.6 State
and explain Le-Chatlelier principle
Q.7 Discuss the condition to increase
the yield of NH3 in Haber’s process.
Q.8 Differntiate
solubility product with solubility.
Q.9 How is Kc used to
predict the direction of a reversible reaction?
Q.10 Predict the effect of change of temperature and effect pressure on
following equilibrium mixture :
H2 + I2 + Heat
↔ 2HI
Q.11State
and explain Law of Mass Action and derive the
equilibrium constant expression for the general equilibrium reaction :
mA + nB
↔ xC +
yD
Problems
Q.1 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.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 At equilibrium a 12 dm3 falsk
contain 0.21 mole of PCl5 0.32 mole of PCl3 and 0.32 mole
Cl2 at 2500 c find the value of Kc for reaction PCl5 ↔
PCl3 +
Cl2
Q.4 Should AgCl precipitate form a
solution prepared mixing of 400 cm3 0.1M NaCl and 600 cm3
0.03M AgNO3 ?
(Ksp of AgCl=1.6* 10-10 mol2/
dm6 )
Q.5 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.6 Kc for a reaction is
0.0194 and the calculated ratio of the concentration of the reactants is 0.0116 . Predict the
direction of the reaction.
Q.7 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.8 For the reaction 2Hl ↔ H2
+ l2, one mole of Hl is introduced into a vessel at constant temperature. Calculate the number of moles of
l2 when the equilibrium is reached(Kc =0.0156).
Q.9 Define Solubility product (Ksp).
Find the Ksp of CaCO3, the solubility of CaCO3
is 0.001 g / dm3
CaCO3 ↔ Ca2+ + CO32-
Q.10 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
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