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Q: Which of the following changes CANNOT be reversed?
  • A. Stretching a rubber band and returning it to its normal size
  • B. Rolling a roti from dough and backing it on a tawa
  • C. Blowing a balloon to increase its size till it is about to burst
  • D. Changing wet clothes to dry clothes
Correct Answer: Option B - A change in which substance loses its identity and produces one or more new substances by change in its composition. It is a permanent change and cannot be easily reversible. Example- burning of wood, digestion of food, rotting of fruits etc. Rolling a roti from dough and baking it on a tawa is a chemical change and it cannot be reversed.
B. A change in which substance loses its identity and produces one or more new substances by change in its composition. It is a permanent change and cannot be easily reversible. Example- burning of wood, digestion of food, rotting of fruits etc. Rolling a roti from dough and baking it on a tawa is a chemical change and it cannot be reversed.

Explanations:

A change in which substance loses its identity and produces one or more new substances by change in its composition. It is a permanent change and cannot be easily reversible. Example- burning of wood, digestion of food, rotting of fruits etc. Rolling a roti from dough and baking it on a tawa is a chemical change and it cannot be reversed.