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Q.

If a substance changes from a liquid to a gas, which of the following statements is true?
The substance has undergone a physical change.
The substance has undergone a chemical change.
The substance has undergone both a physical and chemical change.
It is impossible to determine whether the substance has undergone a physical or chemical change.

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a

Only statement 2 is true

b

Only statement 1 is true

c

Both statements 2 and 3 are true

d

Only statement 4 is true

answer is B.

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Detailed Solution

When a substance changes from a liquid to a gas, it is said to undergo a physical change. This is because only the state of the substance is changed. The chemical composition remains the same and it can be converted back to its original form. So only statement 1 is true.

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