#### Term 2 Chemical Bonding Three Marks Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 30
10 x 3 = 30
1. What is chemical bond?

2. Write the basic concept of Kossel - Lewis theory

3. Define ionic bond

4. What is covalent bond?

5. Name of the following:
(a) An element which obtains the noble gas configuration of neon by losing three electrons.
(b) An element which gains two electrons to obtain noble gas configuration of Neon.

6. Identify the following reactions as oxidation/reduction/redox reaction.
(a) Zn + CuSO4 $\rightarrow$ Cu + ZnS O4
(b) CuO + H2$\rightarrow$ Cu + H2O
(c) 2Mg + O2 $\rightarrow$ 2MgO

7. What are oxidising agents? Given example

8. Ionic bond is also called electrostatic bond.

9. Ionic compounds are crystalline solids at room temperature.

10. Covalent compounds have low melting point.