Question

Formation of water from hydrogen and oxygen in presence of electric spark in (a)physical change (b)chemical change (c)both a & b (d)mixture is formed​

Answer 1

ANSWER:-

When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out, the chemical changes involved in the two is combination reaction.

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Answer 2

The formation of water from hydrogen and oxygen in presence of an electric spark is a chemical change. Thus, the correct option is (b).

Explanation:

• When hydrogen and oxygen are reacted together by passing an electric spark, the formation of water takes place.
• The reaction can be represented as:

        $\[2{H_2} + {O_2} \to 2{H_2}O + Energy\]$

• The reaction releases a large amount of energy.
• The formation of a new compound takes place in the process.
• The molecular composition of the product (water) formed is different from hydrogen and oxygen.
• Therefore, the process is a chemical change.