Chemistry - 9 Chapter - 5Chemical BondingTest - 3

Chemistry - 9 Chapter - 5
Chemical Bonding
Test - 3

1. SA-Why atoms of noble gases do not combine with
other items

a) Their atoms have 8 electrons in outer most shell Those are not inert
b) Due to lack of reactivity
c) Those are not inert
d) Due to 8 electron in outer shell and lack of reactivity

2. What is meant by word Octet?

a) A group of eight, especially eight singers or instrumentalists
b) A group of seven, especially singers or instrumentalists

3. SA-What principle is known as octet rule?

a) When an atom has eight electrons in its outer most shell, it is said to be stable and does not combine with other atoms to reduce its energy. This is called octet rule.
b) When an atom has two electrons in its outer most shell, it is said to be stable and does not combine with other atoms to reduce its energy. This is called octet rule.

4. 8 electrons in outer most orbit means reactivity?

a) True
b) False

5. SA-Why atoms form bonds?

a) To overcome the force of attraction
b) Two answers are correct
c) To equalize force of compulsion
d) To lower energy by completing their octet

6. For Sodium atom it is easy to lose one electron and stabilize itself than to gain electrons?

a) 6
b) 8
c) 2
d) 7

7. What is Chlorine?

a) A poisonous gas, greenish-yellow in clour that combines with nearly every other element.
b) A poisonous gas, greenish-yellow in clour that does not combines with any other element.

8. Sodium atom loses one electron to form a bond with ------------- atom?

a) Hydrogen
b) Helium.
c) Chlorine
d) Oxygen

9. Sodium has ___electrons in outermost shell?

a) 4
b) 1
c) 3
d) 7

10. SA-What significant role was played by octet rule?

a) Role in finding atomic number
b) Role in understanding structure of an atom
c) Role in finding atomic mass
d) Role in understanding formation of chemical bond

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