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9th Standard English Medium Science Subject Chemical Bonding Book Back 3 Mark Questions with Solution Part - I updated Book back Questions

9th Standard English Medium Science Subject Chemical Bonding Book Back 3 Mark Questions with Solution Part - I

9th Standard

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 15
    5 x 3 = 15

  1. Explain Octet rule with an example.

  2. Find the odd one out.
    (i) H2, Cl2, NaCl, O2, N2
    (ii) H2O2, MnO4–, LiAlH4, Cr2O72–

  3. Identify the following reactions as oxidation or reduction
    a. Na \(\rightarrow\)Na+ + e-.
    b. Fe3+ + 2e-\(\rightarrow\) Fe+

  4. An atom X with atomic number 20 combines with atom Y with atomic number 8. Draw the dot structure for the formation of the molecule XY.

  5. Why are Noble gases inert in nature?

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