Chemistry - 9 Chapter - 5Chemical BondingTest - 2

Chemistry - 9 Chapter - 5
Chemical Bonding
Test - 2

1. In this world everything has a tendency to?

a) Raise its energy
b) Breakdown
c) Join together
d) Lower its energy

2. Atoms have a tendency to lower their energy.

a) True
b) False

3. Atoms have a tendency to increase their energy?

a) True
b) False

4. SA ( Shotr Answer) - Give examples of lowering energy? (Remember by heart(RBH))

a) All are correct
b) Air move to lesser area having less air pressure
c) Current flows from higher charge to lower one
d) Water flows to area having lower level

5. SA- How atoms succeed in lowering their "energy? (Remember by heart(RBH)

a) By bombining together as molecules
b) By moving their electrons to the inner orbit
c) By combining together moving electron in outer orbit
d) By repelling each other

6. SA-When scientists came to know the way electrons lower their energy?

a) When two atoms were combined
b) When periodic table was prepared In 1869
c) When noble gases were discovered

7. SA-Why noble gases are considered most stable?

a) All are correct
b) Except helium all have 8 electrons in outer shell
c) Because these are inert
d) Those were found late

8. Noble gases do not react with other elements because these have ?"

a) 9 electrons in outer most shell
b) 8 electrons in outer most shell
c) 5 electrons in outer most shell
d) 2 electrons in outer most shell

9. All noble gases have 8 electrons in outermost shell except , which has 2.

a) Neon
b) Helium
c) Xenon
d) Krypton

10. Atoms of noble gases do not combine with "themselves nor with other elements?

a) False
b) True

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