Question

Which of the following processes nonspontaneous?(a) Dissolving KCl in water(b) mixing of iodine vapour and nitrogen gas(c) decomposition of NaCl to Na (s) and Cl₂ (g)(d) freezing of water at 270K.

Answer 1

Answer:

a is the correct answer

Answer 2

Decomposition of NaCl to Na (s) and $Cl_{2}$(g) is a non-spontaneous process.

Explanation:

A spontaneous reaction is defined as the process which tends to occur on its own. And, a non-spontaneous reaction is defined as a process for the completion of which we have to provide certain conditions.

For example, when we dissolve KCl in water then potassium chloride being ionic in nature will dissolve on its own. Hence, it will be a spontaneous process.

On the other hand, decomposition of NaCl will occur when we heat it as it is an ionic compound which is stronger in nature. Hence, it is a non-spontaneous process.

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