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Chemical Equilibrium Chemistry - Chemical Equilibrium

Maharashtra Board - STD 11 Science - Chemistry (MSBSHSE - English Medium). 99 questions in this chapter.

Question types

Chemical Equilibrium question types

99 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

99
Questions
6
Question groups
5
Question types
Sample Questions

Chemical Equilibrium questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
When volume of the equilibrium reaction $C _{( s )}+ H _2 O _{( g )} \rightleftharpoons CO _{( g )}+ H _{2(g)}$ is increased at constant temperature the equilibrium will
  • ✓
    shift from left to right
  • B
    shift from right to left
  • C
    be unaltered
  • D
    can not be predicted

Answer: A.

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Q 2MCQ1 Mark
The relation between $K _{ c }$ and $K _{ p }$ for the reaction $A _{( g )}+ B _{( g )} \rightleftharpoons 2 C _{( g )}+ D _{( g )}$ is
  • A
    $K_c=K_p / R T$
  • ✓
    $K_p=K c^2$
  • C
    $K_c=\frac{1}{\sqrt{K_p}}$
  • D
    $K_p / K_c=1$

Answer: B.

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Q 3MCQ1 Mark
For the equilibrium $Cl _{2(g)}+2 NO _{( g )} \rightleftharpoons 2 NOCl _{( g )}$ the concerntration of NOCl will increase if the equlibrium is disturbed by ………..
  • ✓
    adding $Cl_2$
  • B
    removing $NO$
  • C
    adding $NOCl$
  • D
    removal of $Cl_{2}2$

Answer: A.

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Q 4MCQ1 Mark
For the equlibrium, A ⇌ 2B + Heat, the number of ‘A’ molecules increases if
  • A
    volume is increased
  • ✓
    temperature is increased
  • C
    catalyst is added
  • D
    concerntration of B is decreased

Answer: B.

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Q 5MCQ1 Mark
The equilibrium , $H _2 O _{(l)} \rightleftharpoons H ^{+}{ }_{( aq )}+ OH ^{-}{ }_{( aq )}$ is
  • ✓
    dynamic
  • B
    static
  • C
    physical
  • D
    mechanical

Answer: A.

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Q 16Answer the following in brief.3 Marks
i. If $NH_3$​​​​​​​ is added to the equilibrium system (Haber process), in which direction will the equilibrium shift to consume added $NH_3$ to reduce the effect of stress?
ii. In this process, out of the reactions (reverse and forward reaction), which reaction will occur to a greater extent?
iii. What will be the effect on yield of $NH_3?$
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Q 17Answer the following in brief.3 Marks
Comment on the extent to which the forward reaction will proceed, from the magnitude of the equilibrium constant for the following reactions:
$i. H_{2(g)} + I_{2(g)} ⇌ 2HI_{(g)}, K_c = 20 at 550 K$
$ii. H_{2(g)} + Cl_{2(g)} ⇌ 2HCl_{(g)}, K_c = 1018 at 550 K$
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Q 19Answer the following in brief.3 Marks
i. Dissolve a given amount of sugar in minimum amount of water at room temperature.
ii. Increase the temperature and dissolve more amount of sugar in the same amount of water to make a thick sugar syrup solution.
iii. Cool the syrup to the room temperature.
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Q 21Answer the following questions.4 Marks
i. Consider the following dissociation reaction:
Image
The reaction is carried out in a closed vessel starting with hydrogen iodide.
ii. Now, let us start with hydrogen and iodine vapour in a closed container at a certain temperature.
$H_{2(g)} + I_{2(g)} ⇌ 2HI_{(g)}$
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Q 25Answer the following questions.4 Marks
Calcium earbonate when heated strongly, decomposes to form calcium oxide and carbon dioxide.
i. If this reaction is carried out in a closed container, what will we observe?
ii. Consider this reaction occurring in an open system or container, what will happen? Can we obtain back calcium carbonate?
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Q 26Answer the following questions in detail.6 Marks
Calculate $K _{ C }$ and $K_{ p }$ for the reaction at $295 K , N _2 O _4 \rightleftharpoons 2 NO _{2( g )}$ if the equilibrium concentrations are $\left[ N _2 O _4\right]=0.75 M$ and $\left[ NO _2\right]=0.062 M$, $R =0.08206 L atm K ^{-1} mol ^{-1}$.
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Q 27Answer the following questions in detail.6 Marks
Equal concentrations of hydrogen and iodine are mixed together in a closed container at $700 K$ and allowed to come to equilibrium. If the concentration of $HI$ at equilibrium is $0.85 \ mol \ dm^{-3},$ what are the equilibrium concentrations of $H_2$ and $I_2$ if $K_C = 54$ at this temperature?
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