Burning of wood and rusting of iron bar are examples of ________ changes.

chemical

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periodic

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temporary

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physical

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Solution

The correct option is A chemical
When we burn wood a new substance called ash is formed. Also, during rusting of iron a brown flaky layer of iron oxide is formed on the iron surface. So, there is a colour change along with formation of a new substance. Such types of changes where there is formation of a new substance are called chemical changes. Chemical changes are permanent in nature. Also, the given changes are non-periodic in nature.

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Similar questions

Burning of wood and rusting of the iron bar are examples of ___________ reaction.

Which of the following are the examples of a chemical reaction?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

Which of the following are physical changes and which are chemical changes?

(a) Burning of a magnesium wire

(b) Freezing of water

(d) Glowing of an electric bulb

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