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Byju's Answer
Standard XII
Chemistry
Entropy
S=q/T , is fo...
Question
S=q/T , is formula of entropy for reversible process , then why we use it for irrversible process . what is the sign of dlt s [system] for a reaction of melting . it should be + ive right? because the solid absorb heat
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Q.
Define melting point of a solid. Explain what happens when we supply heat energy to the ice at
0
o
C
.
Name the term used for heat absorbed in the above process and define it.
Q.
Which of the following statement(s) is are correct?
Statement (i): The entropy isolated system with P-V work only, is always a maximized at equilibrium.
Statement (ii): It is possible for the entropy of a close system to decrease substantially in an irreversible process.
Statement (iii): Entropy can be created but not destroyed.
Statement (iv):
Δ
S
s
y
s
t
e
m
is zero for reversible process in an isolated system
Q.
Enthalpy change for the process,
H
2
O
(
s
)
⇌
H
2
O
(
l
)
is
6.01
k
J
m
o
l
−
1
.
The entropy change for 1 mole of ice at its melting point will be
Q.
Assertion :For an isothermal reversible process
Q
=
−
W
i.e. work done by the system equals the heat absorbed by the system. Reason: Enthalpy change
(
△
H
)
is zero for isothermal process.
Q.
One mole of
N
a
C
l
(
s
)
on melting absorbed
32.76
k
J
of heat and its entropy is increased by
30
J
K
−
1
. What is the melting point of sodium chloride?
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