Prepared
by:
Lecturer S.Fayyaz Hussain
City Of
Knowledge
(Science Campus)
Add: 24/2 Sheet # 10 Model Colony Near
Model Colony Karachi, Pakistan
Ph : +9221-35449369, +92312-5449369
Ten years
Chapter # 6 Chemical Equilibrium
Q.5 ( c) 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.6 ( b) 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
=( - ve )
Q.6 ( c) How is the equilibrium constant
value used to predict the extent of reaction ?
Q.7 ( a) Explain the term “ Solubility
Product” . What is the criterion for the precipitation from a solution?
Illustrate by calculation whether
PbCrO4 wouid precipitate out if 100 cm3 of 2.5* 10-4
M Pb(NO3)solution is mixed with 300 cm3 solution of KCrO4
concentration 1.5* 10-8 M ( Ksp =1.8*10-14 )
1993
Q. .1 ( a) explain
the following term
Reversible
reaction Equilibrium constant
Solubility product
Q.4 (a) write
short note
Law
of Mass Action
1994
Q.4 ( c)
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.
1995
Q.6 (a) state and
explain Le Chatlelier principle
(b) Discuss the condition to increase
the yield of NH3 in Haber’s process
( c) 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.7 (a) Define
solubility product and solubility
(b) 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 mol/ dm3
.
1995
Q.5 (a) state and
explain Law of Mass Action .
(b) 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 .
( c) What is Common ion Effect ? How is it
applied in qualitative analysis ?
Q.7(d) How is Kc used to predict the
direction of a reversible reaction ?
(e) Kc for areaction is 0.0194 and the calculated ratio of the
concentration of the reactants is 0.0116
. Predict the direction of the reaction
1997
Q.8 (a) State the
following :
Law
of Mass Action le-
Chatelier principle
(b) Predict the effect of change of temperature and effect pressure on
following equilibrium mixture :
N2 + 3H2 ↔
2NH3 +Heat
H2 + I2
+
Heat ↔ 2HI
(c ) Explain Solubility Product .
(d) Should AgCl precipitate from a
solution prepared by mixing 400 cm3
0.1 M Nacl and 600 cm3 of
0.03 M solution of AgNO3?
(
Kc for AgCl =1.6 * 10-10
mol/dm3)
1998
Q.7 (a) state and explain Law of Mass
Action and derive the equilibrium
constant expression for the general equilibrium reaction :
mA + nB
↔ xC
+ yD
(b) the
equilibrium constant expression for a
gaseous equilibrium
No comments:
Post a Comment