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    <pre style="white-space:pre-line"><code>4.Structure of Molecules      eLearn.Punjab

Short answer questions.
1.	     Why do atoms react?
2.	     Why is the bond between an electropositive and an electronegative atom ionic in nature?
3.	     Ionic compounds are solids. Justify.
4.	     More electronegative elements can form bonds between themselves. Justify.
5.	     Metals are good conductors of electricity. Why?
6.	     Ionic compounds conduct electricity in solution or molten form. Why?
7.	     What type of covalent bond is formed in nitrogen molecule.
8.	     Differentiate between lone pair and bond pair of electrons.
9.	      Describe at least two necessary conditions for the formation of a covalent bond.
10.	 Why HCl has dipole-dipole forces of attraction?
11.	 What is a triple covalent bond, explain with an example?
12.	 What is the difference between polar and non-polar covalent bonds, explain with one example	   

         of each?
13.	 Why does a covalent bond become polar?
14.	 What is the relationship between electronegativity and polarity?
15.	 Why does ice float on water?
16.	 Give the characteristic properties of ionic compounds.
17.	 What characteristic properties do the covalent compounds have?

Long answer questions.

1.	 What is an ionic bond? Discuss the formation of ionic bond between sodium and chlorine atoms?
2.	 How can you justify that bond strength in polar covalent compounds is comparable to that of

   ionic compounds?
3.	 What type of covalent bonds are formed between hydrogen, oxygen and nitrogen? Explain

   their bonding with dot and cross model.
4.	 How does a covalent bond develop ionic character in it? Explain.
5.	 Explain the types of covalent bonds with at least one example of each type.
6.	 How is a coordinate covalent bond formed? Explain with examples?
7.	 What is metallic bond? Explain the metallic bonding with the help of a diagram.

                          20</code></pre>
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