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Subject :NSO    Class : Class 7

Which of the following statements is false regarding physical and chemical properties?

A The composition of matter need not be changed for observing a physical change.
B During a chemical reaction, molecules undergo a change and their concentration keeps decreasing along with time.
C Chemical property is the ability of matter to undergo some chemical change because of its composition.
D During a chemical reaction, same molecules are present throughout the change.

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

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