Science

9th

grade

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ATOMS AND MOLECULES -CLASS-9

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  • 1. Multiple Choice
    30 seconds
    1 pt

    1.A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

    a) Law of Conservation of Mass

    b) Las of Multiple Proportions

    c) Law of Definite Proportions

    d) Avogadro’s Law

  • 2. Multiple Choice
    30 seconds
    1 pt

    2.An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:

    (a) XY

    (b) XY2

    (b) XY2

    (d) XY4

  • 3. Multiple Choice
    30 seconds
    1 pt

    3.The molecular formula of potassium nitrate is ________.

    (a) KNO3

    (b) KNO

    (c) KNO2

    (d) KON

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