Question

Explain the types of reaction with reference to oxygen and hydrogen.illustratre with explain.

Answer 1

If it is the first one: hydrogen and oxygen undergo direct combination or combustion forming water. This reaction is also known as oxidation reaction since hydrogen is oxidised by (you guessed it) oxygen.

2H2+O2= 2H2O +∆(heat energy)

Answer 2

Answer:

There are two types of reaction with reference to oxygen and hydrogen.

1. Oxidation reaction

2. Reduction reaction

Explanation:

1. Oxidation reaction:

The chemical reaction in which a reactant combines with oxygen or loses hydrogen to form the product is called oxidation reaction.

Examples:

1. When carbon burns in air, it forms carbon dioxide. In this reaction, carbon combines with oxygen, therefore this is an oxidation reaction.

$\sf\:C_{(\:s\:)}\:+\:O_{2\:(\:g\:)}\:\longrightarrow\:CO_{2\:(\:g\:)}$

2. When sodium reacts with ethyl alcohol, sodium ethoxide and hydrogen gas is formed. In this reaction, hydrogen is removed from ethyl alcohol, therefore this is an oxidation reaction.

$\sf\:2C_2H_5OH_{(\:l\:)}\:+\:2Na\:\longrightarrow\:2C_2H_5ONa\:+\:H_2\:\uparrow\\\\\sf\:Ethyl\:alcohol\:\:\:Sodium\:\:\:Sodium\:ethoxide\:\:Hydrogen$

2. Reduction:

The chemical reaction in which a reactant combines with hydrogen or loses oxygen to form a product is called reduction reaction.

Examples:

1. When hydrogen is passed over black copper oxide, a reddish coloured layer of copper is formed.

In this reaction, oxygen is removed from CuO to form copper, therefore, it is a reduction.

$\sf\:CuO_{(\:s\:)}\:+\:H_{2\:(\:g\:)}\:\longrightarrow\:Cu_{(\:s\:)}\:+\:H_2O_{(\:l\:)}$

2. When hydrogen is passed over coke ( a type of coal ), methane is formed.

In this reaction, hydrogen combines with coke ( carbon ), therefore, it is reduction.

$\sf\:C_{(\:s\:)}\:+\:2H_{2(\:g\:)}\:\longrightarrow\:CH_{4\:(\:g\:)}$