Out of the following processes, which is/are chemical change(s)?
Cooking gas starts burning on ignition
Erosion of rocks takes place to form soil.
Iron article undergoes rusting.
Effervescense is formed on adding baking soda into a test tube containing dilute acid.
A
Cooking gas starts burning on ignition
B
Effervescense is formed on adding baking soda into a test tube containing dilute acid.
C
Iron article undergoes rusting.
D
Erosion of rocks takes place to form soil.
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Solution
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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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