SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are NOT signs that a chemical reaction occured?
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the properties changed
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bubbles of gas formed
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color stays the same
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smells different
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Explanation:
Detailed explanation-1: -Changes in color, a precipitate forming, a change in temperature, or a change in pH indicate a chemical reaction is occurring. Phenolphthalein is an indicator that is clear in acids. When a base is added to an acid, phenolphtalein turns pink.
Detailed explanation-2: -Color change is a characteristic of a chemical reaction taking place.
Detailed explanation-3: -Color Change. Production of an odor. Change of Temperature. Evolution of a gas (formation of bubbles) Precipitate (formation of a solid) 02-Apr-2021
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