For which of the following reactions is Gay-Lussac’s law not valid?

P C l_{5} (g) \to P C l_{3} (g) + C l_{2} (g)

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H_{2} (g) + C l_{2} (g) \to 2 H C l (g)

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2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

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2 K C l O_{3} (s) \to 2 K C l (s) + 3 O_{2} (g)

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Solution

The correct option is D $2 K C l O_{3} (s) \to 2 K C l (s) + 3 O_{2} (g)$
Gay-Lussac’s law is only valid for gases. Therefore, reactants and products both must be gases.

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Statement 1. Gay Lussac’s law explains about the relation between presssure and temperature at constant volume.

Statement 2. Dalton’s law is valid for gases that can react with each other.

2 K C l O_{3} (s) ⟶ 2 K C l (s) + 3 O_{2} (g)

2 K C l O_{3} (s) H e a t - --- \to c a t a l y s t 2 K C l (s) + 3 O_{2} (g)

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