Identify the following reactions as endothermic or exothermic
(i) $2 N a H C O_{3} + H e a t e n e r g y \to N a_{2} C O_{3} + H_{2} O + C O_{2}$
(ii) $2 M g + O_{2} \to 2 M g O + e n e r g y$

(i) Exothermic (ii) Endothermic

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(i) Endothermic (ii) Exothermic

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(i) Exothermic (ii) Exothermic

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(i) Endothermic (ii) Endothermic

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Solution

The correct option is B (i) Endothermic (ii) Exothermic
(i) $2 N a H C O_{3} + H e a t e n e r g y \to N a_{2} C O_{3} + H_{2} O + C O_{2}$ (Endothermic reaction)
(ii) $2 M g + O_{2} \to 2 M g O + e n e r g y$ ( Exothermic)

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Similar questions

Q. Identify the following reactions as endothermic or exothermic.
(i)

2 N a H C O_{3} + e n e r g y ⟶ N a_{2} C O_{3} + H_{2} O + C O_{2}

(ii)

2 M g + O_{2} ⟶ 2 M g O + e n e r g y

Q. Which of these changes does a burning matchstick undergo?
(i) Endothermic reaction
(ii) Exothermic reaction
(iii) Chemical change

Q. (a) What do you understand by exothermic and endothermic reactions?
(b) Give one example of an exothermic reaction and one of an endothermic reaction.
(c) Which of the following are endothermic reactions and which are exothermic reactions?
(i) Burning of natural gas
(ii) Photosynthesis
(iii) Electrolysis of water
(iv) Respiration
(v) Decomposition of calcium carbonate

Q. The following reaction is an example of a

2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)

I. Combination reaction
II. Decomposition reaction
III. Endothermic reaction
IV. Exothermic reaction

The following reaction is an example of a
$2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)$
I. Combination reaction
II. Decomposition reaction
III. Endothermic reaction
IV. Exothermic reaction

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Identify the following reactions as endothermic or exothermic(i) 2NaHCO3+Heat energy→Na2CO3+H2O+CO2(ii) 2Mg+O2→2MgO+energy

The correct option is B (i) Endothermic (ii) Exothermic(i) 2NaHCO3+Heatenergy→Na2CO3+H2O+CO2 (Endothermic reaction)(ii) 2Mg+O2→2MgO+energy( Exothermic)

Identify the following reactions as endothermic or exothermic
(i) $2 N a H C O_{3} + H e a t e n e r g y \to N a_{2} C O_{3} + H_{2} O + C O_{2}$
(ii) $2 M g + O_{2} \to 2 M g O + e n e r g y$

The correct option is B (i) Endothermic (ii) Exothermic
(i) $2 N a H C O_{3} + H e a t e n e r g y \to N a_{2} C O_{3} + H_{2} O + C O_{2}$ (Endothermic reaction)
(ii) $2 M g + O_{2} \to 2 M g O + e n e r g y$ ( Exothermic)