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Question
Which of the following is not an observation that determines a chemical change?
Which of the following is not an observation that determines a chemical change?
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Solution
The correct option is D
Change in mass
Evolution of a gas, change in state, change in colour and change in temperature are the observations that help to determine whether a chemical reaction has taken place or not. The change in mass of a substance may not necessarily mean that a chemical reaction has taken place. It can be attributed to a physical change also.
Hence, the correct answer is option (d).
Change in mass
Evolution of a gas, change in state, change in colour and change in temperature are the observations that help to determine whether a chemical reaction has taken place or not. The change in mass of a substance may not necessarily mean that a chemical reaction has taken place. It can be attributed to a physical change also.
Hence, the correct answer is option (d).
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