Case study (4 Marks)

MCQ 14 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Colloidal sols scatter light while true solutions do not.
Reason: The particles in the colloidal sol move much slower than that of the true solution.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: B.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

The size of the colloidal particles is large enough to scatter light while particles of a true solution are too small to scatter light.

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MCQ 24 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Colloidal particles show Brownian movement.
Reason: Brownian movement arises because of the impact of the molecules of the dispersion medium with the colloidal particles.

✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: A.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

The impact of the molecules of the dispersion medium on the colloidal particles are unequal leading to zig$-$zag motion i.e., Brownian movement.

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MCQ 34 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Lyophilic sols are prepared by directly mixing the substance with the dispersion medium.
Reason: Lyophobic sols can not be prepared by simply mixing the substance with the dispersion medium.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: B.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

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MCQ 44 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: The molecules on the surface have lesser energy than the molecules inside.
Reason: During adsorption, the surface of solid is in a state of strain.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
✓
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: D.

Assertion is wrong statement but reason is correct statement.

The molecules on the surface have higher energy than those inside. The surface of a solid or a liquid is in a state of strain or tension on account of the unbalanced or residual forces.

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MCQ 54 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: A colloidal sol of $\ce{As_2S_3}$ is coagulated faster by $\ce{0.1M\ BaCl_2}$ than by $\ce{0.1M NaCl.}$
Reason: $BaCl_2$ gives double the number of $Cl^-$ ions than $\ce{NaCl.}$

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: B.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

$\ce{As_2S_3}$ being negatively charged is coagulated faster by $Ba^{2+}$ ions than by $Na^+$ ions, according to Hardy Schulze rule, which states that greater the valency of the flocculating ion added, greater is its power to cause precipitation.

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MCQ 64 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: In chemisorption, adsorption keeps on increasing with temperature.
Reason: Chemisorption increases with increase of pressure.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
✓
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: D.

Assertion is wrong statement but reason is correct statement.

ln chemisorption, adsorption first increases with temperature and then decreases.
The heat initially supplied acts as activation energy for the chemical reaction occurring between adsorbate and adsorbent.

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MCQ 74 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Lyophitic colloids are called reversible sols.
Reason: Lyophilic sols are liquid loving.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: B.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

If the dispersion medium is separated from the dispersed phase, the lyophilic sol can be reconstituted by simply remixing with the dispersion medium. That is why these sols are also called reversible sols.

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MCQ 84 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Porous or finely divided fonns of adsorbents adsorb larger quantities of adsorbate.
Reason: The greater the specific area of the solid, the greater would be its adsorbing capacity.

✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: A.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

Porous or finely divided fonns of adsorbent possess greater specific area which is available for adsorption per gram of the adsorbent.

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MCQ 94 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: The enthalpy of physisorption is lesser than chemisorption.
Reason: Molecules of adsorbate and adsorbent are held by van der Waal's forces in physisorption and by chemical bonds in chemisorption.

✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: A.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

The enthalpy of chemisorption is of the order of $200\ kJ\ mol^{-1}$ while for physical adsorption it is of the order of $20\ kJ\ mol^{-1}.$

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MCQ 104 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Soap and detergent are macromolecular colloids.
Reason: Macromolecular colloids are formed by molecules of large size.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
✓
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: D.

Assertion is wrong statement but reason is correct statement.

Soap and detergent are associated colloids as they are formed by the aggregation of a large number of ions due to attraction towards the oppositely charged ions in concentrated solution.

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MCQ 114 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: There is no interface between gases.
Reason: The shape and volume of gases are not definite.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: B.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

There is no interface between gases due to their complete miscibility.

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MCQ 124 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Gases are easily adsorbed on the surface of metals especially transition metals.
Reason: Transition metals have free valencies.

✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: A.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

As the number of free valencies increases, the surface area for adsorbtion of gases on solid surface also increases.

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MCQ 134 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Aqueous gold colloidal solution is red in colour.
Reason: The colour arises due to scattering of tight by colloidal gold particles.

✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: A.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

The colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles. The wavelength of light further depends on the size and nature of the particles. Finest gold sol is red in colour. As size of the particles increases, it becomes purple, then blue and finally golden yellow.

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MCQ 144 Marks

In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: According to Freundlich, $\frac{\text{x}}{\text{m}}=\text{k}.\text{P}^\frac{1}{\text{n}}$
Reason: The isotherm shows variation of the amount of gas adsorbed by the adsorbent with temperature.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
✓
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement.

Answer

Correct option: C.

Assertion is correct statement but reason is wrong statement.

Freundlich adsorption isotherm gives an empirical relationship between the quantity of gas adsorbed by unit. mass of solid adsorbent $\Big(\frac{\text{x}}{\text{m}}\Big)$ and pressure at a particular temperature.

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Chemistry Case study (4 Marks)

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