Question # 1

How many valance shell electrons are there in Na+ ion.

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8

9

1

10

Water has high boiling point as compared a alcohol due to

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Low density

High surface tension

Hydrogen bonding

High vapour pressure

Which form of carbon is used as a lubricant?

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Coal

Diamond

Charcoal

Graphite

The boiling point of alcohal is

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₄₄^oC

78^oC

53^oC

19^oC

Whcih types of bond is present between NH3 and BF3

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Covalend Bond

Ionic Bond

Co ordinate covalent bond

Metallic Bond

Which metal has the lowest melting point?

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Li

Na

Rb

K

Nitrogen molecule contains.

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Polar covalent bond

Triple Covalent bond

Double covalent bond

Single covalent bond

Which molecule contains a single vovalent bond.

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CH4

C2H4

C2H2

O2

Which of the following bond s is expected to b the weakest.

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Cl-Cl^-

C-C

F-F

O -O

Which of the following is an exampel of polar covalent compound.

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Cl2

H2

O2

HCl

Atoms react with each other because.

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they are attracted towards each other

They are short of electrons

They want to disperse

They want attain stability

Noble gases are non -reactive, because they do not.

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Gain electrons

Lose electrons

Share electrons

All of these

How many electron are there in the valence shell of sodium atom.

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One

Two

Three

Four

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Chemistry 9th Class English Medium Unit 3 Online Test MCQs With Answers

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