Out of the following processes, which is/are chemical change(s)?

Cooking gas starts burning on ignition

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Iron article undergoes rusting.

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Erosion of rocks takes place to form soil.

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Effervescense is formed on adding baking soda into a test tube containing dilute acid.

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Solution

The correct options are
A Cooking gas starts burning on ignition
C Iron article undergoes rusting.
D Effervescense is formed on adding baking soda into a test tube containing dilute acid.
Chemical change
Cooking gas starts burning on ignition.
Effervescence is formed by adding baking soda into a test tube containing dilute acid.
Iron article undergoes rusting.
Physical change
Erosion of rocks takes place to form soil.
Option $A, B, D$ are correct

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