When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place :

(a) in the first case ?

(b) in the second case ?

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Solution

(a) Combination reaction. $2 H_{2} + O_{2} ⟶ 2 H_{2} O$

(b) Decomposition reaction. $2 H_{2} O ⟶ 2 H_{2} + O_{2}$

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When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place : (a) in the first case ? (b) in the second case ?

(a) Combination reaction. 2H2+O2⟶2H2O (b) Decomposition reaction.2H2O⟶2H2+O2

When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place :

(a) in the first case ?

(b) in the second case ?

(a) Combination reaction. $2 H_{2} + O_{2} ⟶ 2 H_{2} O$

(b) Decomposition reaction. $2 H_{2} O ⟶ 2 H_{2} + O_{2}$