Question

One of the following is an endothermic reaction. This is
(a) combination of carbon and oxygen to form carbon monoxide
(b) combination of nitrogen and oxygen to form nitrogen monoxide
(c) combination of glucose and oxygen to form carbon dioxide and water
(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen

Answer 1

Answer:

c

Explanation:

Answer 2

Endothermic reaction:

This is (b) combination of nitrogen and oxygen to form nitrogen monoxide.

Explanation:

• The reaction is:

        $N_{2(g)}+O_{2(g)} \rightleftarrows 2 N O_{(g)}$

• The combination of nitrogen and oxygen requires platinum or manganese oxide as catalyst. This is because nitrogen monoxide is an unstable compound.
• The temperature should be elevated around 1200°C to 1300°C. It is a colourless toxic gas. This gas help in signalling and immune system of animals. This is also used in applications in medicines.
• This reaction without catalyst takes place in the lightning. Here the temperature required is around 2000°C which is the temperature in lightning.
• The nitrogen oxide products combines with water vapour in clouds to nitrate which helps in growth of plants.