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Combination Reaction

Which one of ...

Question

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

Both sodium and oxygen are elements which combine to give sodium oxide. The other choices involve the combination of compounds and not elements.

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Similar questions

Which one of the following chemical equations represent combustion reactions?

C + O_{2} \to C O_{2}

B: $C + \frac{1}{2} O_{2} \to C O$

C: $C O + \frac{1}{2} O_{2} \to C O_{2}$

C (g r a p h i t e) + \frac{1}{2} O_{2} \to C O Δ H_{1} = - 110.5 k J / m o l

C O + \frac{1}{2} O_{2} \to C O_{2} Δ H = - 283.2 k J / m o l

k J / m o l

C (g r a p h i t e) + O_{2} \to C O_{2} Δ H = ?

C

+ \frac{1}{2} O_{2} \to C O; Δ H = - 110.5

C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 283.2

C (graphite) + O_{2} \to C O_{2}

From the thermochemical reactions,

C + 1/2O₂ → CO; ∆H = -110.5 kJ

CO + 1/2O₂→ CO₂; ∆H = -283.2 kJ

The heat of reaction C + O₂ → CO₂ is:

From the thermo chemical reactions,

$C_{(g r a p h i t e)} + \frac{1}{2} O_{2} \to C O; Δ H = - 110.5 K J$

$C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 283.2 K J .$

$Δ H$ for the reaction, $C_{(g r a p h i t e)} + O_{2} \to C O_{2}$ is:

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