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Chemistry MCQ

Chemical Equilibrium · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 17 questions.

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17 questions · auto-graded multiple-choice test.

MCQ 11 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
Correct option: A.
shift from left to right
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MCQ 21 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
Correct option: B.
$K_p=K c^2$
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MCQ 31 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
Correct option: A.
adding $Cl_2$
adding $Cl_2$
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MCQ 41 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
Correct option: B.
temperature is increased
temperature is increased
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MCQ 51 Mark
The equilibrium , $H _2 O _{(l)} \rightleftharpoons H ^{+}{ }_{( aq )}+ OH ^{-}{ }_{( aq )}$ is
  • ✓
    dynamic
  • B
    static
  • C
    physical
  • D
    mechanical
Answer
Correct option: A.
dynamic
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MCQ 61 Mark
The rate of formation of $NH _3$ can be increased by using catalyst..........
  • A
    $Fe + Co$
  • B
    $Mo + Fr$
  • ✓
    $Fe + Mo$
  • D
    $Fe + Mg$
Answer
Correct option: C.
$Fe + Mo$
(C) $Fe + Mo$
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MCQ 71 Mark
The equilibrium constant for the reaction:
$N _{2( g )}+ O _{2( g )} \rightleftharpoons 2 NO _{( g )}$ is $4 \times 10^{-4}$ at $2000 K$. In presence of a catalyst, the equilibrium is attained ten times faster. Therefore, the equilibrium constant in presence of catalyst of $2000 K$ is .................
  • A
    $40 \times 10^{-4}$
  • B
    $4 \times 10^{-2}$
  • C
    $4 \times 10^{-3}$
  • ✓
    $4 \times 10^{-4}$
Answer
Correct option: D.
$4 \times 10^{-4}$
(D) $4 \times 10^{-4}$
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MCQ 81 Mark
Identify the CORRECT statement.
  • ✓
    Catalyst lowers activation energy for the forward and reverse reactions by exactly the same amount.
  • B
    The value of equilibrium constant decreases in presence of a catalyst.
  • C
    Catalyst affect the position of the equilibrium.
  • D
    Catalyst changes the equilibrium composition of a reaction mixture.
Answer
Correct option: A.
Catalyst lowers activation energy for the forward and reverse reactions by exactly the same amount.
(A) Catalyst lowers activation energy for the forward and reverse reactions by exactly the same amount.
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MCQ 91 Mark
The reaction $A+B \rightleftharpoons C+D+$ heat, has reached equilibrium. The reaction may be made to proceed forward by
  • A
    adding more $C$
  • B
    adding more $D$
  • ✓
    decreasing the temperature
  • D
    increasing the temperature
Answer
Correct option: C.
decreasing the temperature
(C) decreasing the temperature
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MCQ 101 Mark
8. The following reaction occurs in the blast furnace where iron ore is reduced to iron metal:
$
3 Fe _2 O _{3( s )}+3 CO _{( g )} \rightleftharpoons 2 Fe _{( l )}+3 CO _{2( g )}
$

Using the Le Chatelier's principle, predict which one of the following will NOT disturb the equilibrium?
  • A
    Removal of $CO$
  • B
    Removal of $CO _2$
  • C
    Addition of $CO _2$
  • ✓
    Addition of $Fe _2 O _3$
Answer
Correct option: D.
Addition of $Fe _2 O _3$
(D) Addition of $Fe _2 O _3$
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MCQ 111 Mark
For the equilibrium reaction$2 NO _{2( g )} \rightleftharpoons N _2 O _{4( g )}+60.0kJ$, the increase in temperature…………
  • A
    favours the formation of $N _2 O _4$
  • ✓
    favours the decomposition of $N _2 O _4$
  • C
    does not affect the equilibrium
  • D
    stops the reaction
Answer
Correct option: B.
favours the decomposition of $N _2 O _4$
(B) favours the decomposition of $N _2 O _4$
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MCQ 121 Mark
For which of the following reaction, $K _{ p }= K _{ C }$ ?
  • A
    $PCl _{5( g )} \rightleftharpoons PCl _{3( g )}+ Cl _{2( g )}$
  • B
    $N _{2( g )}+3 H _{2( g )} \rightleftharpoons 2 NH _{3( g )}$
  • ✓
    $H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
  • D
    $2 NO _{2( g )} \rightleftharpoons N _2 O _{4( g )}$
Answer
Correct option: C.
$H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
(C) $H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$
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MCQ 131 Mark
For the reaction $CO _{( g )}+ Cl _{2( g )} \rightleftharpoons COCl _{2( g )}, Kp _{ p } / K _{ C }$ is equal to $\qquad$
  • ✓
    $\frac{1}{ RT }$
  • B
    $RT$
  • C
    $\sqrt{ RT }$
  • D
    1.0
Answer
Correct option: A.
$\frac{1}{ RT }$
(A) $\frac{1}{ RT }$
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MCQ 141 Mark
The equilibrium constant value for the reaction:
$2 H _{2( g )}+ O _{2( g )} \rightleftharpoons 2 H _2 O _{( g )}$ is $2.4 \times 10^{47}$ at $500 K$. What is the value of equilibrium constant for the reaction:
$2 H _2 O _{( g )} \rightleftharpoons 2 H _{2( g )}+ O _{2( g )} ?$
  • A
    $0.41 \times 10^{-46}$
  • B
    $0.41 \times 10^{47}$
  • C
    $0.41 \times 10^{-48}$
  • ✓
    $0.41 \times 10^{-47}$
Answer
Correct option: D.
$0.41 \times 10^{-47}$
(D) $0.41 \times 10^{-47}$
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MCQ 151 Mark
For the reaction $C_{(s)} + CO_{2(g)} ⇌ 2CO_{(g)}$ the partial pressure of $CO_2 $ and $CO$ are $4$ and $8$ atm, respectively, then $K_P $ for the reaction is $………$
  • ✓
    $16$ atm
  • B
    $2$ atm
  • C
    $5$ atm
  • D
    $4$ atm
Answer
Correct option: A.
$16$ atm
$16$ atm
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MCQ 161 Mark
For the system $3 A+2 B \rightleftharpoons C$, the expression for equilibrium constant is……….
  • A
    $\frac{[3 A ][2 B ]}{ C }$
  • B
    $\frac{[C]}{[3 A ][2 B ]}$
  • C
    $\frac{[A]^3[B]^2}{[C]}$
  • ✓
    $\frac{[C]}{[A]^3[B]^2}$
Answer
Correct option: D.
$\frac{[C]}{[A]^3[B]^2}$
(D) $\frac{[C]}{[A]^3[B]^2}$
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MCQ 171 Mark
Which of the following is expression of $K _{ C }$ for $2 NH _{3( g )} \rightleftharpoons N _{2( g )}+3 H _{2( g )}$ ?
  • ✓
    $\frac{\left[ N _2\right]\left[ H _2\right]^3}{\left[ NH _3\right]^2}$
  • B
    $\frac{\left[ N _2\right]\left[ H _2\right]}{\left[ NH _3\right]}$
  • C
    $\frac{\left[ N _2\right]\left[3 H _2\right]}{\left[2 NH _3\right]}$
  • D
    $\frac{\left[ NH _3\right]}{\left[ N _2\right]\left[ H _2\right]^3}$
Answer
Correct option: A.
$\frac{\left[ N _2\right]\left[ H _2\right]^3}{\left[ NH _3\right]^2}$
(A) $\frac{\left[ N _2\right]\left[ H _2\right]^3}{\left[ NH _3\right]^2}$
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