1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 9th April Morning Slot

Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log $${x \over m}$$ versus log p gives a straight line with slope equal to 0.5, then:

( $${x \over m}$$ is the mass of the gas adsorbed per gram of adsorbent)
A
Adsorption is independent of pressure.
B
Adsorption is proportional to the pressure.
C
Adsorption is proportional to the square root of pressure.
D
Adsorption is proportional to the square of pressure.

Explanation

According to Freundlich adsorption isotherm, in the median range of pressure

       $${x \over m} \propto {P^{{1 \over n}}}$$

$$ \Rightarrow $$  $${x \over m}$$ = kP$$^{{1 \over n}}$$

taking log both sides, we get,

log$${x \over m}$$ = logk + $${1 \over n}$$ logP

Here in graph between log$${x \over m}$$ and logP, slope is $${1 \over n}$$ and intercepts = log k.

Given that,

slope = 0.5

$$\therefore\,\,\,$$ $${1 \over n}$$ = 0.5

$$ \Rightarrow $$   n = 2

$$\therefore\,\,\,$$ $${x \over m}$$ = kP$$^{{1 \over 2}}$$ = k$$\sqrt P $$

$$ \therefore $$  Adsorption is proportional to the square root of pressure.
2
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

Which type of ‘defect’ has the presence of cations in the interstitial sites?
A
Metal deficiency defect
B
Schottky defect
C
Vacancy defect
D
Frenkel defect

Explanation

In Frenkel defect in a molecule an atom or ion (normally the cation) leave their original site and places itself in the interstitial site (area between all other cations and anions). Which is shown below

3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Morning Slot

Which of the following statements about colloids is False ?
A
Freezing point of colloidal solution is lower than true solution at same concentration of a solute.
B
Colloidal particles can pass through ordinary filter paper.
C
When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is formed.
D
When excess of electolyte is added to colloidal solution, colloidal particle will be precipitated.

Explanation

Freezing point of colloidal solution is same as true solution at same concentration of a solute.
4
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Morning Slot

Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance ?
A
B
C
D

Explanation

In antiferro magnetic substance, magnetic dipoles are in opposite direction and cancel out eachother's magnetic moment.

Questions Asked from Solid State & Surface Chemistry

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