Reaction A: $H_{2} (g) + F_{2} (g) \to 2 HF (g)$
Reaction B: $H_{2} (g) + I_{2} (g) \to 2 HI (g)$
Reaction C: $2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l)$
Match the above reactions with the given options.

occurs in darkness

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requires catalyst

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highly exothermic

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Solution

Reaction A: Flourine $(F_{2})$ reacts readily with hydrogen gas to give hydrogen flouride. This reaction occurs even in darkness.

Reaction B: Iodine $(I_{2})$ reacts with hydrogen gas on heating in the presence of a catalyst to produce hydrogen iodide. This reaction requires a catalyst to progress.

Reaction C: Hydrogen gas reacts violently with oxygen gas to form water and liberates a very large amount of heat i.e, it is a highly exothermic reaction.

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Similar questions

H_{2} (g) + F_{2} (g) \to 2 HF (g)

H_{2} (g) + I_{2} (g) \to 2 HI (g)

2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l)

N_{2} (g) + O_{2} (g) \to 2 N O (g)

Δ H = 181

2 C O_{2} (g) \to 2 C O (g) + O_{2} (g); Δ H = 566

H_{2} (g) + I_{2} (g) \to 2 H I (g); Δ H = - 94

H_{2} (g) + F_{2} (g) \to 2 H F (g); Δ H = - 541

2 H I (g) ⇋ H_{2} (g) + I_{2} (g)

25^{\circ} C

\frac{1}{2} H_{2} (g) + \frac{1}{2} I_{2} (g) ⇌ H I (g) is K_{c}

2 H I (g) ⇌ H_{2} (g) + I_{2} (g)

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