1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure P. $${x \over m}$$ is proportional to :

A
P2
B
P$${^{{1 \over 4}}}$$
C
P$${^{{1 \over 2}}}$$
D
P

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.

From the given graph,

slope = $${2 \over 4}$$ = $${1 \over 2}$$

$$\therefore\,\,\,$$ $${1 \over n}$$ = $${1 \over 2}$$

$$ \Rightarrow $$   n = 2

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

$$ \therefore $$$${x \over m} \propto {P^{{1 \over 2}}}$$
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

For coagulation of arsenious sulphate sol, which one of the following salt solution will be most effective ?
A
BaCl2
B
AlCl3
C
NaCl
D
Na3PO4

Explanation

Sulphide is $$-$$ve charged colloid.

As coagulation is directly proportional to the effective charge, so cation with maximum charge will be most effective for coagulation.

Al3+ > Ba2+ > Na+ coagulating power.
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x $$\mathop A\limits^o $$. What is the approximate density of Cu (in g cm$$-$$3) at this temperature ?
[Atomic Mass of Cu = 63.55 u]
A
$${{205} \over {{x^3}}}$$
B
$${{105} \over {{x^3}}}$$
C
$${{211} \over {{x^3}}}$$
D
$${{422} \over {{x^3}}}$$

Explanation

FCC unit cell Z $$=$$ 4

We know,

d = $$Z \times {M \over {{N_A} \times {a^3}}}$$

$$d = {{63.5 \times 4} \over {6 \times {{10}^{23}} \times {x^3} \times {{10}^{ - 24}}}}g/c{m^3}$$

$$d = {{63.5 \times 4 \times 10} \over 6}g/c{m^3}$$

$$d = {{423.33} \over {{x^3}}} \simeq \left( {{{422} \over {{x^3}}}} \right)$$
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Which premitive unit cell has unequal edge lengths (a $$ \ne $$ b $$ \ne $$ c) and all axial angles different from 90o ?
A
Hexagonal
B
Tetragonal
C
Triclinic
D
Monoclinic

Explanation

In Triclinic unit cell

a $$ \ne $$ b $$ \ne $$ c   &   $$\alpha $$ $$ \ne $$ $$\beta $$ $$ \ne $$ $$\gamma $$ $$ \ne $$ 90o

Questions Asked from Solid State & Surface Chemistry

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