Chemical Bonding

Samacheer Book Back Questions And Answers For Science Standard 9 “Chemical Bonding“

I. Choose the correct answer:
1. Number of valence electrons in carbon is
(a) 2
(b) 4
(c) 3
(d) 5

2. Sodium having atomic number 11, is ready to _____ electron / electrons to attain the nearest noble gas electronic configuration.
(a) gain one
(b) gain two
(c) lose one
(d) lose two

3. The element that would form anion by gaining electrons in a chemical reaction is _____.
(a) potassium
(b) calcium
(c) fluorine
(d) iron

4. Bond formed between a metal and non metal atom is usually _____.
(a) ionic bond
(b) covalent bond
(c) co-ordinate bond

5. _____ compounds have high melting and boiling points.
(a) Covalent
(b) Coordinate
(c) Ionic

6. Covalent bond is formed by _____.
(a) transfer of electrons
(b) sharing of electrons
(c) sharing a pair of electrons

7. Oxidising agents are also called as _____ because they remove electrons form other substances.
(a) electron donors
(b) electron acceptors

8. Elements with stable electronic configurations have eight electrons in their valence shell. They are _____.
(a) halogens
(b) metals
(c) noble gases
(d) non metals

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