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21.Which of the following is not a sign of a chemical change?Select one:a. Change in color.b. Gas is given off.c. Light is given off.d. Change of state.

Answer :

Answer

d. Change of state

Explanation

a. Change in color is a sign of a chemical change.

b. Gas is given off is a sign of a chemical change.

c. Light is given off is a sign of a chemical change.

d. Change of state is not a sign of a chemical change.

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