Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 1

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${PCl}_{5}$ dissociates into ${PCl}_{3}$ and ${Cl}_{2}$ in a $2 L$ flask at about $600 ° C .$ At equilibrium, mixture is found to contain $1 mole$ $PC$ ls and $2 moles$ each of ${PCI}_{3}$ and ${Cl}_{2} .$ Calculate equilibrium constant $K_{c}$ for the chemical equilibrium:

${PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)$

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Important Questions on Equilibrium

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 2

For a gasesous reaction,

2 A + B ⇌ 2 C,

the partial pressures of

A, B

and

C

at equilibrium are

0.3 atm, 0.4 atm

and

0.6 atm

respectively. The value of

K_{p}

for the reaction would be:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 3

Starting with one mole of nitrogen and $3 moles$ of hydrogen, at equilibrium $50 %$ of each had reacted according to the reaction : $N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g)$

If the equilibrium pressure is $P,$ the partial pressure of hydrogen at equilibrium would be:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 4

At constant pressure and temperature for a heterogeneous equilibrium the value of $K_{p}$ will be

$3 Fe (s) + 4 H_{2} O (g) ⇌ {Fe}_{3} O_{4} (s) + 4 H_{2} (g)$

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 5

For the reaction

A + B ⇌ 2 C, 2

moles of

A

and

3

moles of

B

react. 'If the equilibrium constant

K_{c}

is

4

at

400 ° C .

what will be the moles of $\mathrm{C}$ at equilibrium?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 6

At $460 ° C, K_{c} = 0.5$ for the reaction

${SO}_{2} (g) + {NO}_{2} (q) ⇌ NO (q) + {SO}_{3} (q)$

A mixture of these gases has the following concentration of the reactants and products:

$[S O_{2}] = 0.04 M$ $[{NO}_{2}] = 0.50 M$

$[NO] = 0.30 M$ $[S O_{3}] = 0.02 M$

In which direction must be reaction proceed to reach equilibriüm.

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 7

The degree of dissociation of

N_{2} O_{4}

(1)

obeying the equilibrium,

N_{2} Q_{4} (g) ⇌ 2 {NO}_{2} \cdot (g),

is approximately related to the presure at equilibrium by :

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 8

{PCl}_{5}

is

40 %

. dissociated according to the following reaction, when equilibrium pressure is

2

atm. It will be

80 %

dissociated, when equilibrium pressure is approximately:

{PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 9

${CaCO}_{3} (s) ⇌ CaO (s) + {CO}_{2} (g)$
If $K_{P}$ for the above reaction at $1200 K$ is $1.5 atm .$ Some ${CaCO}_{3}$ is taken in a $10$ litre closed vessel, the number of moles of $CaO$ at equilibrium is:

(Take: $R = \frac{1}{12}$ litre atm $k^{- 1} {mol}^{- 1}$ )