Equilibrium Test

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Equilibrium Test - 42

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Question 1
1 / -0

For the equilibrium: $$ A(g)\rightleftharpoons nB(g), $$ the equilibrium constant, $$ K_p $$ is related with the degree of dissociation , $$ \alpha $$ and the total pressure of gases at equilibrium, P as

A
$$\dfrac { (n\alpha )^{ n }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ n-1 } } $$

B
$$ \dfrac { (n\alpha )^{ n-1 }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ n-1 } } $$

C
$$ \dfrac { \alpha ^{ n-1 }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ } } $$

D
$$ \dfrac { (n\alpha )^{ n }.P^{ n-1 } }{ (1-\alpha { ) }^{ n-1 }.[1+(n-1){ \alpha ] }^{ } } $$

Solution
Question 2
1 / -0

When $$CaCO_3$$ is heated at a constant temperature in a closed container, the pressure due to $$CO_2$$ produced will:

A
change with the amount of $$CaCO_3$$ taken

B
change with the size of the container

C
remain constant so long as temperature is constant

D
remain constant even if temperature is changed

Solution

$$CaCO_3 (s) \rightleftharpoons \ CaO (s) + CO_2 (g)$$

Only temp. & amount of $$CO_2$$ will affect equilibrium position.
Question 3
1 / -0

For the reaction : $$CO(g) + H_{2}O(g) \rightleftharpoons CO_{2}(g) + H_{2}(g)$$ at a given temperature, the equilibrium amount of $$CO_{2}$$ can be increased by

A
adding a suitable catalyst

B
adding an inert gas

C
decreasing the volume of the container

D
increasing the amount of $$CO(g)$$

Solution

Option D is correct. The equillibrium amount of $$CO_2$$ can be increase by increase in the amount of $$CO$$ because there is an increase in amount of gas present in reactant sides.
Question 4
1 / -0

An inert gas is added to the following equilibrium, $$A(s)+2B(g)\rightleftharpoons 3C(g)$$ at constant pressure. The equilibrium

A
is not affected

B
shifts to right

C
shifts to left

D
may shift right and left both

Solution

When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, the number of moles per unit volume of various reactants and products will decrease. Hence, the equilibrium will shift towards the direction in which there is an increase in the number of moles of gases.

The addition of inert gas at constant pressure to the above reaction will shift the equilibrium towards the forward direction (shift to the right) because the number of moles of products (gas state) is more than the number of moles of the reactants.

Option B is correct.
Question 5
1 / -0

Pure ammonia is placed in a vessel at a temperature where its dissociation constant is appreciable. At equilibrium,

A
$$K_p$$ does not change significantly with pressure

B
$$\alpha$$ does not change with pressure

C
concentration of $$NH_3$$ does not change with pressure

D
concentration of $$H_2$$ is less than that of $$N_2$$

Solution

Kp doesn't change with pressure & concentration.
Question 6
1 / -0

Which of the following is a buffer?

A
$$NaOH+CH_{3}COONa$$

B
$$NaOH+Na_{2}SO_{4}$$

C
$$K_{2}SO_{4}+H_{2}SO_{4}$$

D
$$NH_{4}OH+NH_{4}Cl$$

Solution

Buffer is mixture of weak base and its salt with strong acid .

Option D is correct.
Question 7
1 / -0

In which of the following solutions, ions are present

A
Sucrose in water

B
Sulphur in $$CS_{2}$$

C
Caesium nitrate in water

D
Ethanol in water

Solution

being an ionic salt Caesium nitrate $$CsNO_3$$ in water it contain ions.

$$CsNO_3\rightarrow Cs^-+NO^-_3$$
Question 8
1 / -0

Amongst the following the buffer solution is______

A
$$NH_{4}Cl+NH_{4}OH$$ solution

B
$$NH_{4}Cl+NaOH$$ solution

C
$$NH_{4}OH+HCl$$ solution

D
$$NaOH+HCl$$ solution

Solution

$$NH_{4}Cl$$ and $$NH_{4}OH$$ is a buffer solution (weak base and salt of strong acid).
Question 9
1 / -0

A buffer solution is a mixture of

A
Strong acid and strong base

B
Weak acid and weak base

C
Weak acid and conjugate acid

D
Weak acid and conjugate base

Solution

A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a $$\text{mixture of}$$$$\text{a weak acid and its conjugate base, or vice versa.}$$ Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.
Question 10
1 / -0

The ionisation constant of phenol is higher than that of ethanol because___________

A
Phenoxide ion is bulkier than ethanoxide

B
Phenoxide ion is stronger base than ethanoxide

C
Phenoxide ion is stabilised through delocalisation

D
Phenoxide ion is less stable than ethoxide

Solution

Phenol are more acidic than ethanol because of stabilization of phenoxide as compare to ethoxide ion.

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Equilibrium Test - 42

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Equilibrium Test - 42

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Question 1

$$\dfrac { (n\alpha )^{ n }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ n-1 } } $$

$$ \dfrac { (n\alpha )^{ n-1 }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ n-1 } } $$

$$ \dfrac { \alpha ^{ n-1 }.P^{ n-1 } }{ (1-\alpha ).[1+(n-1){ \alpha ] }^{ } } $$

$$ \dfrac { (n\alpha )^{ n }.P^{ n-1 } }{ (1-\alpha { ) }^{ n-1 }.[1+(n-1){ \alpha ] }^{ } } $$

Solution

Question 2

change with the amount of $$CaCO_3$$ taken

change with the size of the container

remain constant so long as temperature is constant

remain constant even if temperature is changed

Solution

Question 3

adding a suitable catalyst

adding an inert gas

decreasing the volume of the container

increasing the amount of $$CO(g)$$

Solution

Question 4

is not affected

shifts to right

shifts to left

may shift right and left both

Solution

Question 5

$$K_p$$ does not change significantly with pressure

$$\alpha$$ does not change with pressure

concentration of $$NH_3$$ does not change with pressure

concentration of $$H_2$$ is less than that of $$N_2$$

Solution

Question 6

$$NaOH+CH_{3}COONa$$

$$NaOH+Na_{2}SO_{4}$$

$$K_{2}SO_{4}+H_{2}SO_{4}$$

$$NH_{4}OH+NH_{4}Cl$$

Solution

Question 7

Sucrose in water

Sulphur in $$CS_{2}$$

Caesium nitrate in water

Ethanol in water

Solution

Question 8

$$NH_{4}Cl+NH_{4}OH$$ solution

$$NH_{4}Cl+NaOH$$ solution

$$NH_{4}OH+HCl$$ solution

$$NaOH+HCl$$ solution

Solution

Question 9

Strong acid and strong base

Weak acid and weak base

Weak acid and conjugate acid

Weak acid and conjugate base

Solution

Question 10

Phenoxide ion is bulkier than ethanoxide

Phenoxide ion is stronger base than ethanoxide

Phenoxide ion is stabilised through delocalisation

Phenoxide ion is less stable than ethoxide

Solution

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