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Class 9 Chemistry · Chapter 2 · Test 4

Isotopes and Radioactivity

25 MCQs • Practice isotope properties, radioactive decay, radioactive isotopes, and their applications in medicine, archaeology, and industry.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What is the defining feature of isotopes of an element?

    • ADifferent numbers of protons
    • BSame number of protons but different numbers of neutrons
    • CSame mass number
    • DDifferent chemical identities
    Show answer

    Answer: B

    Isotopes have the same atomic number but different numbers of neutrons.

  2. Question 2

    Which particles are different in number in isotopes of the same element?

    • AProtons
    • BElectrons in neutral atoms
    • CNeutrons
    • DPositively charged particles
    Show answer

    Answer: C

    Isotopes differ in the number of neutrons in their nuclei.

  3. Question 3

    Which pair consists of isotopes of hydrogen?

    • AProtium and helium
    • BDeuterium and tritium
    • CHydrogen and helium
    • DProtium and oxygen
    Show answer

    Answer: B

    Deuterium and tritium are both isotopes of hydrogen.

  4. Question 4

    Which hydrogen isotope contains no neutron?

    • ADeuterium
    • BTritium
    • CProtium
    • DHelium-3
    Show answer

    Answer: C

    Protium contains one proton and no neutrons.

  5. Question 5

    How many neutrons are present in deuterium?

    • A0
    • B1
    • C2
    • D3
    Show answer

    Answer: B

    Deuterium has one proton and one neutron in its nucleus.

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