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Chapter: 9th Science : Chemistry : Chemical Bonding

One Mark Questions Answers

Science : Chemistry : Chemical Bonding : Book Back Important Questions, Answers, Solutions : I. Choose the correct answer, II. Fill in the blanks, III. State whether true or false. If false, correct the statement, IV. Match the following, V. Assertion and reason type questions

CHEMICAL BONDING

TEXT BOOK EXERCISES

 

I. Choose the correct answer :

 

1. Number of valence electrons in carbon is

(a) 2

(b) 4

(c) 3

(d) 5

[Answer: (b) 4 ]

 

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

[Answer: (c) lose one]

 

3. The element that would form anion by gaining electrons in a chemical reaction is ――― .

(a) potassium

(b) calcium

(c) fluorine

(d) iron

[Answer: (c) fluorine]

 

4. Bond formed between a metal and non metal atom is usually ――― .

(a) ionic bond

(b) covalent bond

(c) co-ordinate bond

[Answer: (a) ionic bond]

 

5. ――― compounds have high melting and boiling points.

 (a) Covalent

(b) Coordinate

(c) Ionic

[Answer: (c) Ionic]

 

6. Covalent bond is formed by ――― .

(a) transfer of electrons

(b) sharing of electrons

(c) sharing a pair of electrons

[Answer: (b) sharing of electrons]

 

7. Oxidising agents are also called as ――― because they remove electrons form other substances.

(a) electron donors

(b) electron acceptors

[Answer: (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

[Answer: (c) noble gases]

 

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