everyday science MCQ #3799

Which one of the following represents a chemical change?

everyday science MCQ #3799

  1. Question 1

    Q1. Which one of the following represents a chemical change?

    • A) Evaporation of alcohol
    • B) Sublimation of iodine
    • C) Heating a platinum wire in a Bunsen flame
    • D) Heating of mercuric oxide powder

    Answer: Heating of mercuric oxide powder

    Explanation: Heating mercuric oxide causes it to decompose into mercury and oxygen — a chemical reaction that produces new substances, which is the hallmark of a chemical change.