What are thermochemical reactions?

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Solution

Some of the chemical reactions can be achieved by the supply of heat only. These reactions are called thermo chemical reactions or thermolysis.

For example, In industries limestone rocks are heated to get quicklime (calcium oxide).

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Which of the following is/are thermochemical reaction(s)?

The chemical reactions in which the light energy is liberated or absorbed is called thermochemical reactions.

C

+ \frac{1}{2} O_{2} \to C O; Δ H = - 110.5

C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 283.2

C (graphite) + O_{2} \to C O_{2}

S (s) + O_{2} (g) \to {S O}_{2} (g) Δ H^{\circ} = - 297 k J

2 {S O}_{2} (g) + O_{2} (g) \to 2 {S O}_{3} (g) Δ H^{\circ} = - 198 k J

{S O}_{3} (g)

S (s) + {3 / 2 O}_{2} (g) \to {S O}_{3} (g)

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