1. Are suspension of one phase in another.

Contain only water-soluble particles.

Assertion: Lowering of temperature, increases the rate of physisorption. Reason: Adsorption increases with an increase in temperature. If both the assertion and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false

Assertion is true but reason is false.

Both assertion and reason are true and the reason is the correct explanation of the assertion.

Both assertion and reason are true but the reason is not the correct explanation of the assertion.

Both assertion and reason are false.

Chemistry - Surface Chemistry - Quiz-4

Which property of colloidal solution is independent of charge on the colloidal particles?

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Coagulation
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Electrophoresis
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Electroosmosis
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Tyndall effect

The Langmuir adsorption isotherm is deduced using the assumption:

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The adsorption takes place in multilayers
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The adsorption sites are equivalent in their ability to adsorb the particles
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The heat of adsorption varies with coverage
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The adsorbed molecules interact with each other

A plot of log x/m verses log p for the adsorption of a gas on a solid gives a straight line with slope equal to:-

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-log k
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n
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1/n
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log k

The function of zymase is to:

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1. Change starch into sugar.
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Ferment glucose to alcohol and CO₂.
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Change malt sugar into glucose.
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Change starch into malt sugar and dextrin.

Surface tension of lyophilic sols is :

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1. Lower than water.
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More than water.
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Equal to water.
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None of the above.

All colloids:

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1. Are suspension of one phase in another.
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Are two-phase systems.
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Contain only water-soluble particles.
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Are true solutions.

The minimum amount of an electrolyte required to cause coagulation of a sol is called :

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1. Coagulation value
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Gold number
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Protective value
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None of these

Peptization involves:

1. Precipitation of colloidal particles.

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4. Both and (3)
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2. Disintegration of colloidal aggregates.
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3. Purification of colloids.
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4

An emulsifying agent is a substance which

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1. Stabilizes the emulsion.
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De-stabilizes the emulsion.
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Coagulates the emulsion.
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Break the interfacial film between suspended particle and medium.

Blue colour of the sky is due to :

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1. Absorption of light by dust particles.
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Reflection of light by dust particles.
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Scattering of light by dust particles.
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None of the above.

The Brownian movement of colloidal particles is because of –

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Convection currents in the fluid
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Unequal bombardments by the molecules of the dispersion medium on colloidal particles
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Setting of dispersed phase under gravity
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Thermal gradient in the medium

When ${FeCl}_{3}$ solution is added to $NaOH$ a negatively charged sol is obtained. It is due to the

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Presence of basic group
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Preferential adsorption of ${OH}^{-}$ ions
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Self dissociation
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Electron capture by sol particles

Graph between log $\frac{x}{m}$ and log P is a straight line inclined at an angle $θ$ - 45°. When pressure of 0.5 atm and log k = 0.699, the amount of solute adsorbed per g of adsorbent will be

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1 g/g adsorbent
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1.5 g/g adsorbent
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2.5 g/g adsorbent
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0.25 g/g adsorbent

The stabilization of the dispersed phase in a lyophobic sol is due to

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The viscosity of the medium
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The surface tension of the medium
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Liking for the medium
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The formation of an electrical layer between the two phases

Which of the following reactions leads to the formation of a substance in colloidal state?

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() $2 {HNO}_{3} + 3 H_{2} S \overset{}{\to} 3 S + 3 H_{2} O + 2 NO$
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() ${SnCl}_{2} + {HgCl}_{2} \overset{}{\to} {SnCl}_{4} + Hg$
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() $2 Mg + {CO}_{2} \overset{}{\to} 2 MgO + C$
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() $Cu + {CuCl}_{2} \overset{HCl}{\to} {Cu}_{2} {Cl}_{2}$

$1 mol$ of $[AgI] I^{-}$ can be coagulated by -

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$1 mol of Pb {({NO}_{3})}_{2}$
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$\frac{1}{2} mol of Pb {({NO}_{3})}_{2}$
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$\frac{2}{3} mol of Pb {({NO}_{3})}_{2}$
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None of the above.

The process of converting precipitate into collidal solution on adding an electrolyte is called:

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Peptisation
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Dialysis
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Electro-osmosis
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Eelectrophoresis

Assertion: Physical and chemical adsorption respond differently to a rise in temperature.

Reason: Chemical adsorption requires some activation energy.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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1
0%
2
0%
3
0%
4

Assertion : Catalyst in general, in the form of finely divided powder.

Reason : Finer is the particle of a solid, greater is its surface area.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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1
0%
2
0%
3
0%
4

Assertion : The addition of ferric hydroxide sol to arsenic sulphide sol results in the precipitation

of both.

Reson : The colloidal particles in ferric hydroxide carry positive charge, whereas those in arsenic

sulphide sol carry negative charge.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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3
0%
4
0%
1
0%
2

Assertion: Lowering of temperature, increases the rate of physisorption.

Reason: Adsorption increases with an increase in temperature.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Both assertion and reason are true and the reason is the correct explanation of the assertion.
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Both assertion and reason are true but the reason is not the correct explanation of the assertion.
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Assertion is true but reason is false.
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Both assertion and reason are false.

Colloids can be prepared by

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Tyndall Effect
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Electrophoresis
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Dialysis
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Peptization

Water Vapours can be adsorbed and absorbed respectively by -

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Silica gel and ${CaCl}_{2}$
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Chalk and ${CaCl}_{2}$
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${CaCl}_{2}$ and Silica gel
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${CaCl}_{2}$ and Chalk

In an adsorption experiment, a graph between log(x/m) versus log P was found to be linear with a slope of 45 $°$ . The intercept on the y-axis was found to be 0.3. The value of x/m at a pressure of 3 atm for Freundlich adsorption isotherm 1/n remains constant is:

[Antilog 0.3=2]

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2
0%

4
0%

6
0%

5

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

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rate is proportional to the surface coverage
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rate is inversely proportional to the surface coverage
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rate is independent of the surface coverage
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rate of decomposition is very slow

Coagulating power of an ion depends on -

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The magnitude of the charge on the alone.
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Size of the ion alone.
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Both magnitude and sign of the charge the ion.
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The sign of the charge on the ion alone.

Fog is a colloidal solution of -

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Gas in liquid
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Solid in gas
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Gas in gas
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Liquid in gas

In Freundlich adsorption isotherm, the value of 1/n is -

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Between 0 and 1 in all cases.
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Between 2 and 4 in all cases.
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1 in case of physical adsorption.
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1 in case of chemisorption.

Which one of the following statements is incorrect about enzyme catalysis?

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Enzymes are mostly proteinous in nature.
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Enzyme action is specific.
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Enzymes are denaturized by ultraviolet rays at high temperature.
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Enzymes are least reactive at optimum temperature.

The protecting power of lyophilic colloidal sol is expressed in terms of

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Coagulation value
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Gold number
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Critical micelle concentration
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Oxidation number

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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