Chemical Reaction Indicators | MCQs

    Q1: Which is the best indication that a chemical reaction has taken place?

    کون سا بہترین اشارہ ہے کہ کیمیائی رد عمل ہوا ہے؟
    • A. Metal budding when placed in an unknown liquid
    • B. None
    • C. Blue powder turns water blue
    • D. A white substance dissolving in water
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