Equilibrium Test

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Equilibrium Test - 5

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Weekly Quiz Competition

Question 1
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Which of the following is not a general characteristic of equilibria involving physical processes?

A
All the physical processes stop at equilibrium.

B
All measurable properties of the system remain constant.

C
The opposing processes occur at the same rate and there is dynamic but stable condition

D
Equilibrium is possible only in a closed system at a given temperature.

Solution

This is a wrong statement that all the physical processes stop at equilibrium, the processes never stops at equilibrium i.e. the rate of formation of products and rate of formation of reactants become equal.
Question 2
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Which of the following statements is correct?

A
The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.

B
In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.

C
On addition of catalyst the equilibrium constant value is not affected.

D
Equilibrium constant for a reaction with negative ΔH value decreases as the temperature increases

Solution

Ice and water kept in a perfectly insulated thermos flask (no exchange of heat between its contents and the surroundings) at 273K and the atmospheric pressure are in equilibrium state and the system shows interesting characteristic features. We observe that the mass of ice and water do not change with time and the temperature remains constant.
Question 3
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The pH of neutral water at 25^∘C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H⁺ ions and OH⁻ ions are equal. What will be the pH of pure water at 60^∘C?

A
Equal to zero

B
Equal to 7.0

C
Less than 7.0

D
Greater than 7.0

Solution

pH of water will be less 7 only. Water will be acidic even at 60°C
Question 4
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Acidity of BF₃can be explained on the basis of which of the following concepts?

A
Bronsted Lowry as well as Lewis concept

B
Bronsted Lowry concept

C
Lewis concept

D
Arrhenius concept

Solution

GN lewis in 1923 defined an acid as a species which accepts an electron pair and base which donates an electron pair. as BF3 is a electron deficient compounds, hence it is a lewis acid.

BF₃ does not have a proton but still acts as an acid and reacts with NH₃ by accepting its lone pair of electrons.

The reaction can be represented by,

BF₃ + :NH₃→ BF₃ :NH₃
Question 5
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In which of the following solvents is silver chloride most soluble?

A
0.1 mol dm^-3AgNO₃

B
0.1 mol dm⁻³HCl solution

C
H₂O

D
Aqueous ammonia solution

Solution

AgCl is soluble in ammonia due to the formation of complex [Ag(NH₃)₂]⁺Cl^-

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Equilibrium Test - 5

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Question 1

All the physical processes stop at equilibrium.

All measurable properties of the system remain constant.

The opposing processes occur at the same rate and there is dynamic but stable condition

Equilibrium is possible only in a closed system at a given temperature.

Solution

Question 2

The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.

In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.

On addition of catalyst the equilibrium constant value is not affected.

Equilibrium constant for a reaction with negative ΔH value decreases as the temperature increases

Solution

Question 3

Equal to zero

Equal to 7.0

Less than 7.0

Greater than 7.0

Solution

Question 4

Bronsted Lowry as well as Lewis concept

Bronsted Lowry concept

Lewis concept

Arrhenius concept

Solution

Question 5

0.1 mol dm-3 AgNO3

0.1 mol dm−3HCl solution

H2O

Aqueous ammonia solution

Solution

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0.1 mol dm^-3AgNO₃

0.1 mol dm⁻³HCl solution

H₂O