Which of the following reactions results in a decrease in entropy? 2so2 (g) + o2 (g) yields 2so3 (g) 2nh3 (g) yields n2 (g) + 3h2 (g) 2h2o2 (aq) yields 2h2o (l) + o2 (g) nahco3 (aq) + hcl (aq) yields nacl (aq) + h2o (l) + co2 (g)

Option (a) is the correct answer.

Explanation:

Entropy is defined as the degree of randomness of a substance.

For example, gases have more entropy as compared to liquids because molecules a gas have more kinetic energy due to which they move rapidly.

Also, when more number of moles are formed a chemical reaction then it means entropy has increased. But when there are less number of moles formed then it means there is a decrease in entropy.

Thus, we can conclude that the reaction results in a decrease in entropy as 3 moles is giving 2 moles.

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