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Q.

The effect of temperature on spontaneity of reactions are represented as:

 ΔHΔSTemperatureSpontaneity
(A)+-any TNon spontaneous
(B)++low Tspontaneous
(C)--low TNon spontaneous
(D)-+any Tspontaneous

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a

(A) and (C) only

b

(A) and (D) only

c

(B) and (C) only

d

(B) and (D) only

answer is C.

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Detailed Solution

∵ΔG=ΔH−TΔS

For spontaneity of reaction : ΔG=−ve

 ∆H∆S∆GNature
A+-+ at any temperatureNon - spontaneous
B+++ (∆H>T∆S) At low temperatureNon - spontaneous
C--- at low temperatureSpontaneous
D-+- at any temperatureSpontaneous
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