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Question

Predict in how many of the following processes entropy change of the system is positive . 
(i) CaCO3(s)CaO(s)+CO2(g)
(ii) N2(g)+3H2(g)2NH3(g)
(iii) HCl(g)+NH3(g)NH4Cl(s)
(iv) 2SO2(g)+O2(g)2SO3(g)
(v) Cooling of N2(g) from 20oC to 50oC
  1. 2
  2. In all the processess
  3. 3
  4. 1


Solution

The correct option is D 1
Gaseous substances generally possess more entropy than solids. So whenever the products contain more moles of a gas than the reactants, the entropy change is probably positive. And hence, S is 
(i) positive 
(ii) negative 
(iii) negative
(iv) negative 
(v) negative 

Entropy change is positive in 1 process only.

[Note: For a given substance at a given temperature, Sgas>Sliquid>Ssolid]

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