Equilibrium Test

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Equilibrium Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

K_a for CH₃COOH is 1.8×10⁻⁵ and K_b for NH₄OH is 1.8×10⁻⁵. The pH of ammonium acetate will be

A
4.75

B
7.0

C
7.005

D
Between 6 and 7

Solution

Ammonium acetate is a salt of weak acid and weak base.
pH = 1/2[pK_w + pK_a - pKb].
=1/2[14−log(1.8×10⁻⁵)+log(1.8×10⁻⁵)=7.0
Question 2
1 / -0

On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium is predicted by applying the Le Chatelier’s principle. Consider the reaction. N₂(g)+3H₂(g)⇌2NH₃ (g) Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?

A
K will decrease

B
K will increase

C
K will increase initially and decrease when pressure is very high

D
K will remain same

Solution

In the reaction Na(g)+3H₂(g)⇌2NH₃(g)

According to the the Le Chatelier’s principle, at constant temperture, the equilibrium constant will change but K will remain same.
Question 3
1 / -0

What will be the correct order of vapour pressure of water, acetone and ether At 30^∘C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?

A
Acetone < ether < water

B
Water < ether < acetone

C
Water < acetone < ether

D
Ether < acetone < water

Solution

Greater the boiling point, less is the vapour pressure. Hence, the correct order of vapour pressure will be water < acetone < ether.
Question 4
1 / -0

In which of the following reactions, the equilibrium remains unaffected on addition of small amount of argon at constant volume?

A
PCl₅(g)⇌ PCl₃ (g) + Cl₂ (g)

B
H₂ (g) + I₂ (g) ⇌ 2HI (g)

C
N₂(g)+3H₂(g)⇌2NH₃(g)

D
The equilibrium will remain unaffected in all the three cases.

Solution

For addition of inert gas at constant pressure, the reaction having same number of moles in reactant and product side will not go any change in the position of equilibrium.
H₂ (g) + I₂ (g) ⇌ 2HI (g)
The equilibrium constant will be affected on addition of inert gas in all the three cases.
Question 5
1 / -0

For the reaction N2O₄(g) ⇌2NO₂(g), the value of K is 50 at 400 K and 1700 at 500 K. Which of the following option is incorrect?

A
The entropy of the system increases

B
The reaction is endothermic

C
The reaction is exothermic

D
If NO₂ (g) and N2O₄ (g) are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more N₂O₄ (g) will be formed

Solution

As the value of K increases with increase of temperture and K = K_f/ K_{b .}This means that K_fincreases, i.e. forward reaction is favoured. Hence, reaction is endothermic.
Question 6
1 / -0

At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in equilibrium. Which of the following term defines this temperature?

A
Boiling point

B
Phase change temperature

C
Normal melting point and Freezing point

D
Equilibrium temperature

Solution

These are normal melting point and freezing point since they are measured at atmospheric pressure.
Question 7
1 / -0

The ionisation of hydrochloric in water is given below:
HCl (aq) + H₂O (l) ⇌ H₃O⁺+ Cl⁻
Label two conjugate acid-base pairs respectively in the ionization.

A
H₂O, Cl^- and H₃O⁺ ,HCl

B
HCl, Cl^-andH₂O, H₃O⁺.

C
HCl, H₃O⁺and H₃O⁺ ,Cl^-

D
H₃O,Cl^- and HCl, H₂O.

Solution

A species formed by receiving a proton from a base is known as conjugate acid and Conjugate base is a species formed by the removal of proton from an acid.
In this case, Cl^- is formed by donating a proton to water molecule hence it is a conjugate base while protonated water (H₃O⁺)becomes conjugate acid.

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Equilibrium Test - 6

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Equilibrium Test - 6

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SHARING IS CARING

Question 1

4.75

7.0

7.005

Between 6 and 7

Solution

Question 2

K will decrease

K will increase

K will increase initially and decrease when pressure is very high

K will remain same

Solution

Question 3

Acetone < ether < water

Water < ether < acetone

Water < acetone < ether

Ether < acetone < water

Solution

Question 4

PCl5(g)⇌ PCl3 (g) + Cl2 (g)

H2 (g) + I2 (g) ⇌ 2HI (g)

N2(g)+3H2(g)⇌2NH3(g)

The equilibrium will remain unaffected in all the three cases.

Solution

Question 5

The entropy of the system increases

The reaction is endothermic

The reaction is exothermic

If NO2 (g) and N2O4 (g) are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more N2O4 (g) will be formed

Solution

Question 6

Boiling point

Phase change temperature

Normal melting point and Freezing point

Equilibrium temperature

Solution

Question 7

H2O, Cl- and H3O+ ,HCl

HCl, Cl- and H2O, H3O+ .

HCl, H3O+and H3O+ ,Cl-

H3O,Cl- and HCl, H2O.

Solution

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PCl₅(g)⇌ PCl₃ (g) + Cl₂ (g)

H₂ (g) + I₂ (g) ⇌ 2HI (g)

N₂(g)+3H₂(g)⇌2NH₃(g)

If NO₂ (g) and N2O₄ (g) are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more N₂O₄ (g) will be formed

H₂O, Cl^- and H₃O⁺ ,HCl

HCl, Cl^-andH₂O, H₃O⁺.

HCl, H₃O⁺and H₃O⁺ ,Cl^-

H₃O,Cl^- and HCl, H₂O.