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Byju's Answer
Standard XII
Chemistry
Physisorption
In which cond...
Question
In which condition, adsorption will not take place?
A
When
Δ
H
is negative
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B
When
Δ
H
is positive
Δ
S
is positive
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C
When
Δ
H
is positive and
Δ
S
is negative
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D
When
Δ
G
is negative.
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Solution
The correct option is
D
When
Δ
H
is positive and
Δ
S
is negative
Adsorption takes place only when
Δ
G
<
0
i.e.
Δ
H
−
T
Δ
S
<
0
.
So, if
Δ
H
is positive and
Δ
S
is negative then
Δ
H
−
T
Δ
S
will always be positive. So adsorption will not take place.
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Similar questions
Q.
Statement I : If
Δ
H
is positive and
Δ
S
is positive,
Δ
G
must be positive.
Statement II :
Δ
G
=
Δ
H
−
T
Δ
S
.
Q.
Δ
H
is positive and
Δ
S
is negative then the reaction is:
Q.
Assertion :For adsorption
Δ
G
,
Δ
S
and
Δ
H
all have negative values. Reason: Adsorption is a spontaneous process accompanied by decrease in randomness.
Q.
Assertion :For adsorption
Δ
G
,
Δ
H
,
Δ
S
all have negative values. Reason: Adsorption is a spontaneous exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.
Q.
Assertion :For adsorption,
Δ
G
,
Δ
H
and
Δ
S
all have negative values. Reason: Adsorption is a spontaneous exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.
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