Which of the following reaction is endothermic?

C a C O_{3} ⟶ C a O + C O_{2}

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F e + S ⟶ F e S

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N a O H + H C l ⟶ N a C l + H_{2} O

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C H_{4} + 2 O_{2} ⟶ C O_{2} + 2 H_{2} O

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Solution

The correct option is A $C a C O_{3} ⟶ C a O + C O_{2}$
As we know, a dissociation reaction is a chemical reaction where a compound breaks apart into two or more parts and it requires energy for completion.
so, dissociation of $C a C O_{3}$ requires energy.
All other reactions are exothermic.

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2 {KClO}_{3} (s) \overset{∆}{\to} 2 KCl (s) + 3 O_{2} ↑

C a {CO}_{3} (s) \overset{∆}{\to} C a O (s) + {CO}_{2} ↑

Which of the following are examples of combination reaction?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O,

C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O

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