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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

Amongst the following, the total number of reactions/processes in which the entropy increases are: 1. 2NaHCO_3(s) \rightarrow Na_2CO_3(s)+CO_2(g)+H_2O(g) 2. A liquid crystallising into a solid 3. Temperature of a crystalline solid is raised from zero K to 100 K 4. Hard boiling of an egg 5. Devitrification of glass 6. Stretching of a rubber band 7. Desalination of water 8. NH_3(g,\ 10\ atm) \rightarrow NH_3(g,\ 1\ atm)

Answer: 4

Solution

Entropy increases where disorder or gas moles increase: (1) solid decomposing into two gases — entropy increases; (3) heating a crystalline solid increases thermal/vibrational disorder — entropy increases; (4) boiling an egg denatures and disorders its proteins — entropy increases; (8) a gas expanding to lower

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Question ID VK-134999