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Question

Columns 1 represents ΔG,Column 2ΔHand Column 3ΔS.Column1Column2Column3(I)+ve(i)−ve(P)∞(II)∞(ii)0(Q)+ve(III)0(iii)∞(R)−ve(IV)−ve(iv)+ve(S)0
The correct set for Haber’s process is (when equilibrium is just to be reached)

A
(IV) (i) (R)
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B
(IV) (i) (P)
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C
(II) (iii) (R)
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D
(III) (ii) (Q)
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Solution

The correct option is A (IV) (i) (R)
The Haber’s process is given as:
N2(g)+3H2(g)Fe(s)Mo(s)2NH3(g)+Heat
Before reaching to the equilibrium, this reaction is favourable in forward direction
ΔG=ve.
The reaction suggests that heat is released ΔH=ve.
In the reactant side the no. of gaseous moles are higher and lesser in the product side.
It means entropy is decreased.
ΔS=ve

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