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What is the appropriate relation between the reactions of gases and solids?

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What is the appropriate relation between the reactions of gases and solids?

(a) Gases react slower than the solids

(b) Gases react faster than the solids

(c) Gases do not react at all while solids react faster

(d) Both gases and solid reacts at a same rate

I got this question during an online interview.

This is a very interesting question from Crystallization of Solutions, Melts, Glasses and Gels topic in section Preparative Methods of Solid State Chemistry

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The correct answer is (b) Gases react faster than the solids

Easiest explanation: Gases react much more quickly than do solids because mobilities are increased. In addition, the gaseous phase is often important in normal solid state reactions under isothermal conditions where it may act as a rapid means of transporting matter from one crystal to another.

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