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Class 9 Chemistry · Chapter 2 · Test 8

Final Mixed Test

25-MCQ test covering the major topics of the entire chapter, including atomic models, subatomic particles, atomic number and mass number, isotopes, electronic configuration, radioactivity, and relative atomic mass.

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

    Who discovered the electron?

    • AErnest Rutherford
    • BJ J Thomson
    • CJames Chadwick
    • DNiels Bohr
    Show answer

    Answer: B

    J J Thomson discovered the electron through cathode ray experiments

  2. Question 2

    Which scientist discovered the neutron?

    • AJohn Dalton
    • BErnest Rutherford
    • CJames Chadwick
    • DNiels Bohr
    Show answer

    Answer: C

    James Chadwick discovered the neutron in 1932

  3. Question 3

    Which observation in Rutherford's experiment showed that an atom has a small dense nucleus?

    • AAll alpha particles passed straight through
    • BA few alpha particles were deflected through large angles
    • CThe gold foil melted
    • DElectrons were emitted from the foil
    Show answer

    Answer: B

    Large deflections indicated a small concentrated positive nucleus

  4. Question 4

    Which subatomic particle has no electric charge?

    • AProton
    • BElectron
    • CNeutron
    • DPositron
    Show answer

    Answer: C

    Neutrons are electrically neutral

  5. Question 5

    An atom has atomic number 16 and mass number 32. How many neutrons does it contain?

    • A16
    • B32
    • C48
    • D8
    Show answer

    Answer: A

    Neutrons equal mass number minus atomic number which is 32 minus 16 = 16

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