Which of the following are examples of combination reaction-i CaO - O 2- 2 CaCO 3ii CaCO 3- CaO - CO 2iii MgO - CO 2- MgCO 3iv Fe - S - FeSv 2 AgCl - sunlight - 2 Ag - Cl 2vi CH 4-2 O 2- CO 2-2 H 2 Ovii Na 2 O - H 2 O - 2 NaOHA- ii- vii- iv- viB- i- ii- v- viiC- ii- iii- iv- viD- i- iii- iv- vii

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Combination Reaction

Which of the ...

Question

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

(ii), (vii), (iv), (vi)

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(i), (ii), (v), (vii)

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(ii), (iii), (iv), (vi)

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(i), (iii), (iv), (vii)

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Solution

The correct option is D
(i), (iii), (iv), (vii)

The equations given below are examples of combination reaction.

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

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

$F e + S \to F e S$

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

The equations( $C a C O_{3} \to C a O + C O_{2}$ , $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$ , $N a_{2} O + H_{2} O \to 2 N a O H$ ) are not Combination reactions because, in these cases, more than one product are formed.

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Similar questions

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

$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q) + h e a t$

What can be inferred from the above reaction?

(i) $C a O$ is solid.

(ii) $C a O$ can react easily with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water

$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q) + h e a t$

What can be inferred from the above reaction?

(i) $C a O$ is solid.

(ii) $C a O$ reacts with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water.

(vi) The reaction is exothermic.

Cao (s) + $H_{2} O$ (l) → $C a (O H)_{2}$ (aq) + heat.

What can be inferred from the above reaction?

(i) CaO is solid.

(ii) CaO is reactive with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water

(vi) The reaction is Exothermic.

Which of the following are molecules?

(i) O₂

(ii) Argon

(iii) Ammonia

(iv) Helium

(v) Water

(vi) Sugar

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Which of the following are examples of combination reaction? (i) CaO+O2→2CaCO3 (ii) CaCO3→CaO+CO2 (iii) MgO+CO2→MgCO3 (iv) Fe+S→FeS (v) 2AgCl+sunlight→2Ag+Cl2 (vi) CH4+2O2→CO2+2H2O (vii) Na2O+H2O→2NaOH