Nitrogen and hydrogen combine together to form ammonia. Which type of reaction is this?

Endothermic reaction

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Exothermic reaction

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Decomposition reaction

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Combination reaction

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Solution

The correct option is B
Exothermic reaction

In the reaction, bonds between two atoms of nitrogen molecule and atoms of hydrogen molecules are broken and new bonds for ammonia are formed. During this process, heat energy is liberated to the surroundings. Hence this reaction is exothermic.

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C(s) + O_{2} (g) \to {CO}_{2} (g) + Heat

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Assertion: Nitrogen and hydrogen combine together to form ammonia and heat.
Reason: It is an exothermic reaction.

CaO and $C O_{2}$ are produced by heating $C a C O_{3}$ . What are the type of the reaction and the process?

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