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Q.

Predict which of the following reaction(s) has a positive entropy change ?I Ag+aq + Cl-aq →  AgCls II NH4Cls →  NH3g + HClg III 2NH3g → N2g+3H2g

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a

I and II

b

III

c

II and III

d

II

answer is C.

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Change in gaseous moles is positive entropy change is positive
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