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Q: Which of the following observations helps us to determine whether a chemical reaction has taken or not?
  • A. Change in state
  • B. Gas emission
  • C. Colour change
  • D. All these options
Correct Answer: Option D - Changes in state, emission of gas and colour change help in determining whether a chemical reaction has taken place, as two or more substances or elements come into contact with each other in a chemical reaction and atoms are redeveloped. And thus new substances or compounds are obtained. Like - making curd from milk.
D. Changes in state, emission of gas and colour change help in determining whether a chemical reaction has taken place, as two or more substances or elements come into contact with each other in a chemical reaction and atoms are redeveloped. And thus new substances or compounds are obtained. Like - making curd from milk.

Explanations:

Changes in state, emission of gas and colour change help in determining whether a chemical reaction has taken place, as two or more substances or elements come into contact with each other in a chemical reaction and atoms are redeveloped. And thus new substances or compounds are obtained. Like - making curd from milk.