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Question

Which of the following statements is true?
  1. A chemical change is permanent and irreversible
  2. The total mass of the system remains same in a chemical change
  3. A physical change is temporary and reversible
  4. All of the above

A
The total mass of the system remains same in a chemical change
B
A physical change is temporary and reversible
C
All of the above
D
A chemical change is permanent and irreversible
Solution
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The total mass of the system remains same in a chemical change. This is in accordance with the law of the conservation of mass. The total mass of products is equal to the total mass of the reactants.

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