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Published on: 29/08/2019
Equilibrium
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Questions + Answers key
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1.
For an exothermic reaction, what happens to the equilibrium constant if temperature is increased?
2.
A tank is full of water. Water is coming in as well as going out at same rate. What will happen to level of water in a tank? What is name given to such a state?
3.
If in a mixture where Q = k is combined, then what happens?
the reaction shift towards products
the reaction shift towards reactants
nothing appears to happen, but forward and reverse are continuing at the same rate
nothing happens
4.
A chemist dissolves an excess of BaSO4 in pure water at 25°C if its Ksp = 1 x 10-10 what is the concentration of barium in the water?
10-4 M
10-5 M
10-15 M
10-6 M
5.
What effect does a catalyst have on the equilibrium position of a reaction?
a catalyst favours the formation of products
a catalyst favours the formation of reactants
a catalyst does not change the equilibrium position of a reaction
a catalyst may favour reactants or product formation, depending upon the direction in which the reaction is written.
6.
H2 + S ⇌ H2S + energy.
In this reversible reaction, select the factor which will shift the equilibrium to the right.
adding heat
adding H2S
blocking hydrogen gas reaction
removing hydrogen sulphide gas
7.
In a closed system
A(S) ⇌ 4 B(g) + 3 C(g)
If partial pressure of C is doubled, then partial pressure of B will be _____.
\(2\sqrt { 2 } \)times the original value
\(\frac { 1 }{ 2 } \)times the original value
2 times of the original value
\(\frac { 1 }{ 2\sqrt { 2 } } \)times of the original value
8.
What is the correct expression for the representation of the solubility product constant of Ag2 CrO4 ?
[Ag+]2 [CrO42-]
[2Ag+] [CrO42-]
[Ag+][CrO42-]
[2Ag+]2[CrO42-]
9.
A catalyst will increase the rate of a chemical reaction by ______.
shifting the equilibrium to the right
shifting the equilibrium to the left
lowering the activation energy
increasing the activation energy
10.
Hydrogen molecule (H2) can be dissociated into hydrogen atoms (H). Which one of the following changes will not increase the number of atoms present at equilibrium?
adding H atoms
(b) increasing the temperature
increasing the total pressure
increasing the volume of the container
11.
The equilibrium expression, Kc= [CO2] represents the reaction.
C(s) + O2(g) ⇌ CO2(g)
CaCO3(s) ⇌ CaO(s) + CO2(g)
CO(g) + \(\frac { 1 }{ 2 } \) O2(g) ⇌ CO2(g)
CaO(s) + CO2(g) ⇌ CaCO3(s)
1.
k=kf/kb . In exothermic reaction, with increase of temperature, kb increases much more than kf. Hence, K decreases.
2.
It will remain the same because rate of inflow is equal to rate of outflow. The state is called of 'equilibrium'.
3.
(c)
nothing appears to happen, but forward and reverse are continuing at the same rate
4.
(c)
10-15 M
5.
(c)
a catalyst does not change the equilibrium position of a reaction
6.
(a)
adding heat
7.
(d)
\(\frac { 1 }{ 2\sqrt { 2 } } \)times of the original value
8.
(a)
[Ag+]2 [CrO42-]
9.
(c)
lowering the activation energy
10.
(c)
increasing the total pressure
11.
(b)
CaCO3(s) ⇌ CaO(s) + CO2(g)
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