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Class 9 Chemistry · Chapter 3 · Test 1

Why Atoms Bond

25 MCQs covering chemical bonding, stability, lower-energy arrangements, valence electrons, noble gas configurations, and the duplet and octet rules.

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

    Why do atoms generally form chemical bonds?

    • ATo become less stable
    • BTo achieve a more stable electronic arrangement
    • CTo increase their atomic number
    • DTo lose all their electrons
    Show answer

    Answer: B

    Atoms form bonds to attain a more stable electronic arrangement.

  2. Question 2

    Which group of elements is generally chemically unreactive due to stable outer electron shells?

    • AAlkali metals
    • BHalogens
    • CNoble gases
    • DTransition metals
    Show answer

    Answer: C

    Noble gases generally have complete outer electron shells and are relatively unreactive.

  3. Question 3

    What is the outermost electron shell of an atom called?

    • AValence shell
    • BNucleus
    • CInner shell
    • DIsotope shell
    Show answer

    Answer: A

    The outermost shell containing electrons is called the valence shell.

  4. Question 4

    How many electrons are present in the valence shell of a typical stable noble gas other than helium?

    • ATwo
    • BFour
    • CSix
    • DEight
    Show answer

    Answer: D

    Most noble gases have eight electrons in their valence shell.

  5. Question 5

    Which rule describes the tendency of atoms to attain eight electrons in their outermost shell?

    • ADuplet rule
    • BOctet rule
    • CPeriodic rule
    • DAufbau principle
    Show answer

    Answer: B

    The octet rule describes the tendency to attain eight valence electrons.

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