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Chemical Equilibrium · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 15 questions.

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15 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Write an expression for equilibrium constant with respect to concerntration.
Answer
For a reversible chemical reaction at equilibrium, $a A+b B \rightleftharpoons c D$ $+\ dD$
Equilibrium constant $\left( K _{ c }\right)=\frac{[C]^{ c }[ D ]^{ d }}{[ A ]^{ a }[ B ]^{ b }}$
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Question 21 Mark
How does the change of pressure affect the value of equilibrium constant ?
Answer
The change of pressure does not affect the value of equilibrium constant.
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Question 31 Mark
What is the effect of adding chloride on the position of the equilibrium ?
$AgCl _{( s )} \rightleftharpoons Ag _{( aq )}^{+}+ Cl _{( aq )}^{-}$
Answer
Addition of Cl ion will favour the reverse reaction, (that is, equilibrium shift from right to left) This increases the amount of AgCl.
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Question 41 Mark
In a reversible reaction, the reverse reaction has an energy change that is equal and opposite to that of the forward reaction.
Answer
True.
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Question 51 Mark
Any change in the pressure of a gaseous reaction mixture at equilibrium, changes the value of $K_C.$
Answer
False.Any change in the pressure of a gaseous reaction mixture at equilibrium, does not change the value of $K_C.$
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Question 61 Mark
If $\text{QC  <  KCC},$ the reaction will proceed from right to left consuming more product to attain equilibrium.
Answer
False.If $Q_C > K_C$ the reaction will proceed from right to left consuming more product to attain equilibrium.
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Question 81 Mark
Consider an esterification reaction:
Image
What will happen if $H+$ ions are added to the reaction mixture?
Answer
$H^+$ ions act as catalyst in the esterification reaction. Hence, the addition of $H^+ $ ions reduces the time for the completion of reaction.
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Question 91 Mark
By using Le Chatelier's principle, explain the effect of change in pressure for the following equilibrium:
$H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
Answer
As there is the same number of molecules of gas on both sides, change of pressure has no effect on the equilibrium.
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Question 101 Mark
Write KP expression for the reaction:
$a A_{(g)}+b B_{(g)} \rightleftharpoons c C_{(g)}+d D_{(g)}$
Answer
For the given reaction,
$K _{ p }=\frac{\left(P_c\right)^c\left(P_D\right)^d}{\left(P_A\right)^a\left(P_B\right)^b}$
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Question 121 Mark
Give an example of solid-liquid equilibrium.
Answer
A mixture of ice and water in a perfectly insulated thermos flask at 273 $K$ is an example of solid-liquid equilibrium.
$H _2 O _{(s)} \rightleftharpoons H _2 O _{(l)}$
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Question 131 Mark
Why was calcium oxide used in theatre lighting?
Answer
Calcium oxide (CaO) on strong heating glows with a bright white light. Hence, CaO was used in theatre lighting, which gave rise to the phrase ‘in the limelight’.
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Question 141 Mark
What is an open system?
Answer
A system in which exchange of both matter and heat occurs with the surroundings is called an open system.
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Question 151 Mark
What is a closed system?
Answer
A system in which there is no exchange of matter with the surroundings is called a closed system.
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