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Combination Reaction

Which of the ...

Question

Which of the following reactions involves the combination of two elements?

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

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4 N a + O_{2} \to 2 N a_{2} O

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S O_{2} + \frac{1}{2} O_{2} \to S O_{3}

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N H_{3} + H C l \to N H_{4} C l

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Solution

The correct option is B $4 N a + O_{2} \to 2 N a_{2} O$
$4 N a + O_{2} \to 2 N a_{2} O$
In this combination reaction, two pure elements sodium and oxygen combine to form sodium oxide and these elements in a compound are present in definite proportion.

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Similar questions

{CaCO}_{3} \underset{}{\to} CaO + {CO}_{2}

CaO + H_{2} O \underset{}{\to} Ca (OH)_{2}

2 {FeSO}_{4} \underset{}{\to} {Fe}_{2} O_{3} + {SO}_{2} + {SO}_{3}

{NH}_{4} Cl \underset{}{\to} {NH}_{3} + HCl

2 Ca + O_{2} \underset{}{\to} 2 CaO

What type of reactions are represented by the following equations ?

(i) $C a C O_{3} ⟶ C a O + C O_{2}$

(ii) $C a O + H_{2} O ⟶ C a (O H)_{2}$

(iii) $2 F e S O_{4} ⟶ F e_{2} O_{3} + S O_{2} + S O_{3}$

(iv) $N H_{4} C l ⟶ N H_{3} + H C l$

(v) $2 C a + O_{2} ⟶ 2 C a O$

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

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

N_{2} + O_{2} \to 2 N O

In the reaction

$S + \frac{3}{2} O_{2} \to S O_{3} + 2 x k J$ and $S O_{2} + \frac{1}{2} O_{2} \to S O_{3} + y k J$

Heat of formation of $S O_{2}$ is

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

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