Which of the following are examples of combination reactions- -i- CaO - O-2 - 2CaCO-3 -ii- CaCO-3- CaO -CO-2 -iii- MgO- CO-2 - MgCO-3 -iv- Fe- S- FeS -v- 2AgCl- sunlight- 2Ag - Cl-2 -vi- CH-4 - 2O-2 - CO-2 - 2H-2O -vii- Na-2O- H-2O - 2NaOH-ii- -vii- -iv- -vi-i- -ii- -v- -vii-ii- -iii- -iv- -vi-i- -iii- -iv- -vii-

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Combination Reaction

Which of the ...

Question

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

(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 below equations are examples of Combination reactions.

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

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

$F e + S \to F e S$

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

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 more than one product is formed.

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(ii)

P m^{3 +}

(iii)

C u^{+}

(iv)

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(v)

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(vii)

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

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

Identify the following oxides with neutral, acidic, basic and amphoteric oxides.

i) {Al}_{2} O_{3} ii) MgO iii) {SO}_{2} iv) CO v) {Na}_{2} O vi) N_{2} O vii) ZnO viii) {CO}_{2} ix) {SO}_{3} x) CaO .

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Which of the following are examples of combination reactions? (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