1. TV30003 PENGENALAN KIMIA ANALISIS DAN FIZIK
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REVISION EXERCISE 10 (Objective Question)
Section B
21.
The for the above reaction at T K is 0.35. Which of the following are correct if 1 mol
of A and 0.35 mol of B are mixed at T K?
1 The amount of A will decrease.
2 No reaction occurs.
3 The value will decrease.
Initial concentration 1 mol -
Change of concentration -x +2x
Equilibrium concentration 1-x = 1-0.2553
=0.7447
+2x = 2(0.2553)
= 0.5106
0.35 = =
0.35 – 0.35x = => + 0.35x – 0.35 = 0
X=0.2553
(Answer: A. Only 1 is correct. The amount of A decrease from 1 mol to 0.7447 mol)
22. Which of the following statements are true for the reaction?
, negative
1. The rate of reaction decreases with increasing temperature
2. Increasing pressure does not affect the amount of hydrogen produced.
3. Decreasing temperature increases the of the reaction.
(Answer: C. Only 2 and 3 are correct. The rate of reaction should increase when the
temperature increases.)
2. TV30003 PENGENALAN KIMIA ANALISIS DAN FIZIK
SAINS KOHORT 1
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23. The dissociation of water is represented by
, positive
It can be concluded that
1 the conductivity of water will increase with temperature
2 water is acidic at high temperature
3 the decreases with increasing temperature
(Answer: A. Only 1 is correct. Water will not turn to acidic at high temperature. Besides,
increasing temperature does not affect the value of )
24.
Based on the graph it can be concluded that
1 the forward reaction is exothermic
2 increases with decreasing temperature
3 The constant rate at is larger than the rate constant at
(Answer: C. Only 2 and 3 are correct. It is not exothermic reaction but it is an
endothermic reaction.)
25. Which of the following statements are correct based on the graph above?
1 The forward reaction is accompanied by a reduction in volume.
2 The forward reaction is endothermic.
3 The rate of reaction increases with temperature.
(Answer: D. Forward reaction should be accompanied by increase in volume)
26. The value for a reaction increases with increasing temperature. Which of the
following statements are true for the reaction?
1 The reverse reaction is exothermic
2 The amount of products increases with increasing temperature.
3 The equilibrium will shift to the right when pressure increases.
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(Answer: A. Only 1 is correct. Increase in temperature will increase the rate of reaction
for both forward and reverse reaction)
27. Which of the following factors affect the position of equilibrium of a reversible reaction?
1 Temperature
2 Concentration
3 Catalyst
(Answer: B. Only 1 and 2 are correct. This is because catalyst only speed up the reaction)
28. The Contact Process involves the following equilibrium:
- 196 kJ
The pressure employed is about 2 atm. The reasons for using such low pressure are
1 to reduce the cost of production
2 the is negative
3 to increase the yield of
(Answer: A. Only 1 is correct. When the pressure is low, then the reactant used react is
slow. Thus, the low usage of reactant will reduce the cost of production.)
29. For the reaction:
negative
Decreasing temperature will
1 increase the yield of ammonia
2 increase the value of
3 increase the time taken to reach equilibrium
(Answer: C. Only 2 and 3 are correct. The yield of ammonia will increase if the pressure
increase)
30. Which of the following systems are not affected by pressure?
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1
2
3
(Answer: C. Only 2 and 3 are correct. This is because hydrogen and iodine requires
pressure to produce their products)
31. The density of graphite and diamond are respectively 2.3 and 3.5.
Based on the above data alone, it can be concluded that
1 the conversion is accompanied by an increase in volume
2 the activation energy for the forward reaction is very high
3 the rate of conversion at room condition is very slow
(Answer: Only 2 and 3 are correct. The conversion does not accompanied by increasing
volume because graphite is hardly produce.)
32.
Which of the following statements are true for the above reaction?
1 Addition of solid silver will displace the equilibrium to the left.
2 Addition of sodium chloride will displace the equilibrium to the left
3 depends on the temperature
(Answer: Only 1 is correct. If product is greater than reactant, the equilibrium will shift to
the left.)
33. positive
The degree of dissociation of , can be increased by
5. TV30003 PENGENALAN KIMIA ANALISIS DAN FIZIK
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1 using more
2 increasing the temperature
3 decreasing the pressure
(Answer: Only 1 and 2 are correct. Pressure does not affect the degree of dissociation)
