During thermal dissociation of a gas , the vapour density
remains same / increases / decreases / increase in some cases decrease in other

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Solution

Vapour density is directly proportional to molar mass of the gas. In a thermal dissociation of a gas since the product will be smaller molecular weights than that of parent compound the Vapour density decreases.

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During thermal dissociation of a gas , the vapour density remains same / increases / decreases / increase in some cases decrease in other

Vapour density is directly proportional to molar mass of the gas. In a thermal dissociation of a gas since the product will be smaller molecular weights than that of parent compound the Vapour density decreases.

During thermal dissociation of a gas , the vapour density
remains same / increases / decreases / increase in some cases decrease in other