Question

When hydrogen burns in oxygen, --------- is produced.

Answer 1

Hint: Heating of the elements in the presence of air or oxygen is called combustion. During the combustion process some amount of heat and light are going to produce. During the combustion process the air or oxygen reacts with the chemical element and produces a new product.

Complete step by step answer:
- The molecular formula of hydrogen is ${{H}_{2}}$ .
- The molecular formula of oxygen is ${{O}_{2}}$ .
- The combustion reaction of hydrogen and oxygen produces water as the product.
- The chemical reaction of oxygen and hydrogen is as follows.
\[2{{H}_{2}}+{{O}_{2}}\xrightarrow{\Delta }2{{H}_{2}}O+heat\]
- In the above reaction 2 moles of hydrogen reacts with one moles of oxygen and produces 2moles of water as the product.
- During combustion of hydrogen with oxygen with water some amount of heat also will be liberated.
- If the combustion reaction of hydrogen is carried out in atmosphere other than water a small amount of oxides of nitrogen also forms.

- Therefore the product formed during combustion of hydrogen with oxygen is water.

Note: If hydrogen reacts with oxygen then it is called combination reaction. If we do electrolysis of water then the water is going to dissociate and forms hydrogen and oxygen as the products. Then the electrolysis is also called a decomposition reaction. Decomposition means one molecule undergoes splitting and produces two different molecules having different chemical formulas. The electrolysis of water is going to be carried out by using some amount of external energy in the form of electricity.