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Test: Le Chatelier's Principle - JEE MCQ


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10 Questions MCQ Test - Test: Le Chatelier's Principle

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Test: Le Chatelier's Principle - Question 1

In which of the following reactions, the equilibrium remains unaffected on addition of small amount of argon at constant volume?

Detailed Solution for Test: Le Chatelier's Principle - Question 1
Noble gas or inert gas does not react itself due to the extremely low reactivity of noble gas with other substances.
As is a noble gas, it is also unreactive but it decreases the activation energy in both forward as well as backward directions by the same amount of reversible reaction.
When Ar is added at constant volume, the equilibrium will not change as there is no change in the no. of moles of the reaction (forward and backward) of either reactant or products.

No. of moles for forward reaction for reactant and 2 for product
No. of moles for backward reaction for reactant and 2 for product

No. of moles for forward reaction for reactant and 1 for product
No. of moles for backward reaction for reactant and 2 for product

No. of moles for forward reaction for reactant and 2 for product
No. of moles for backward reaction for reactant and 4 for product
Hence, in all cases equilibrium remains unaffected.
Conclusion:
Therefore, the equilibrium will remain unaffected in all three cases.
Hence, the correct answer is option 4.
Test: Le Chatelier's Principle - Question 2

For the formation of from its constituent elements, the favourable conditions for its formation are

Detailed Solution for Test: Le Chatelier's Principle - Question 2

Formation of takes place according to Le-Chatelier's principle.


Number of moles of reactant
Number of moles of product
As number of moles of product is less than number of moles of reactants.
So, increase in pressure will favour forward direction.
As is a gas, so decrease in temperature will favour forward direction.
Hence, high pressure and low temperature are favourable conditions for formation of .

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Test: Le Chatelier's Principle - Question 3

For a reaction A(s) ⇌ B(s) + C(g) the set of all correct statements are
a) K is independent of [A].
b) K is dependent on partial pressure of C at a given temperature.
c) ΔH will be independent of temperature.
d) ΔH is independent of the catalyst addition.

Detailed Solution for Test: Le Chatelier's Principle - Question 3

Given reaction is 


Equilibrium constant for this reaction  concentration of solid is considered as one during heterogenous equilibrium. So, as we can see  is independent of .

Similarly  So,  is dependent on partial pressure of .

Note: Although the value of equilibrium constant does not depend on concentration of reactants or products at a given temperature.

Enthalpy change depends on temperature, but it is independent of catalyst used.

So, statement a,b and d are correct.

Test: Le Chatelier's Principle - Question 4

The % yield of ammonia as a function of time in the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), ΔH < 0 at (P, T1) is given below

If this reaction is conducted at (P, T2), with T> T1, the %yield of ammonia as a function of time is represented by

Detailed Solution for Test: Le Chatelier's Principle - Question 4

Initially on increasing temperature rate of reaction will increase, so yield will also increase with time. But at equilibrium yield at high temperature would be less than at as reaction is exothermic so the graph is

Test: Le Chatelier's Principle - Question 5

Some inert gas is added at constant volume to the following reaction at equilibrium NH4HS(s) ⇌ NH3(g) + H2S(g) 
Predict the effect of adding the inert gas:

Detailed Solution for Test: Le Chatelier's Principle - Question 5

Addition of inert gas at constant volume has no effect on equilibrium.

Test: Le Chatelier's Principle - Question 6

The standard state Gibb's free energy change for the isomerisation reaction cis-2-pentene ⇌ trans-2-pentene is −3.67 kJ mol−1 at 400 K. If more trans-2-pentene is added to the reaction vessel

Detailed Solution for Test: Le Chatelier's Principle - Question 6

Equilibrium shifted in the backward direction. (Le Chatelier's principle)

Test: Le Chatelier's Principle - Question 7

The equilibrium concentrations of and in the formation of at are and respectively. The equilibrium constant at the same temperature is

Detailed Solution for Test: Le Chatelier's Principle - Question 7

No solution. Refer to answer key.

Test: Le Chatelier's Principle - Question 8

The reaction, SO+ Cl⟶ SO2Cl2 is exothermic and reversible. A mixture of , (g) and is at equilibrium in a closed container. Now a certain quantity of extra is introduced into the container, the volume remaining the same. Which of the following is are true?

Detailed Solution for Test: Le Chatelier's Principle - Question 8

By addition of equilibrium will shift to RHS which is exothermic. Hence temperature will increase.

Test: Le Chatelier's Principle - Question 9

Why only gets precipitated as and not as when is passed through an acidic solution containing and ?

Detailed Solution for Test: Le Chatelier's Principle - Question 9

of is less than . In acidic medium ionisation of is suppresed (common ion effect) and of does not exceed.

Test: Le Chatelier's Principle - Question 10

Hemoglobin protein transport in blood and each can bind , molecules. In discussing protein oxygen binding capacity, biochemists use a measure called the  value, defined as the partial pressure of oxygen at which  of hemoglobin is saturated. Fetal hemoglobin has a value of torr and adult has value of torr. For the following equilibrium:

What is the value of
[Where K represents equilibrium constant.]

Detailed Solution for Test: Le Chatelier's Principle - Question 10

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