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

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b. chemical change.

Answer 2

(b) The formation of water from hydrogen and oxygen in presence of electric spark is a chemical change.

Explanation:

• When hydrogen is burnt with oxygen in presence of electric spark the reaction that goes is an example of combination reaction.
• During chemical changes the molecules composition is changed As hydrogen to water.
• Here, two gaseous molecules reacts to form a liquid molecule of different composition. Therefore, the change that goes is a chemical change.
• In physical changes chemical composition of the molecule is not changed. Example: Ice to water to vapor. They all have similar composition.
• In a mixture, al the components are mixed together and they do not react with each other. Example: sugar and water