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Class 9 · Science · Chemistry · Is Matter Around Us Pure

Elements and Compounds MCQs

Practice Elements and Compounds multiple-choice questions from Is Matter Around Us Pure (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.

Elements and CompoundsQuiz - Solve & Score

  1. Q1. A chemist studies the formula of washing soda, Na2CO3. How many DIFFERENT elements are chemically combined in Na2CO3?

    • A.4
    • B.5
    • C.2
    • D.3

    Answer: D. 3

    Count the DIFFERENT element symbols in the formula (the small numbers count atoms, not new elements). Na2CO3 contains sodium, carbon and oxygen, which is 3 different elements.

  2. Q2. A student writes the formula of sulphuric acid, H2SO4. How many DIFFERENT elements are chemically combined in H2SO4?

    • A.3
    • B.4
    • C.5
    • D.2

    Answer: A. 3

    Count the DIFFERENT element symbols in the formula (the small numbers count atoms, not new elements). H2SO4 contains hydrogen, sulphur and oxygen, which is 3 different elements.

  3. Q3. A teacher draws the formula of nitric acid, HNO3. How many DIFFERENT elements are chemically combined in HNO3?

    • A.4
    • B.5
    • C.3
    • D.2

    Answer: C. 3

    Count the DIFFERENT element symbols in the formula (the small numbers count atoms, not new elements). HNO3 contains hydrogen, nitrogen and oxygen, which is 3 different elements.

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More topics in Is Matter Around Us Pure

Colloids, Suspensions and Tyndall EffectMethods of SeparationMixtures vs Pure SubstancesMixtures, solutions, suspensions, colloids, separationPhysical and Chemical ChangesSeparation of Mixtures (Distillation, Chromatography, etc.)Solutions and ConcentrationSolutions, Suspensions and Colloids
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