Question # 1

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

How many covalent bond does C₂H₂ molecule have?

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two

three

four

five

Which one of the following is heterogeneous mixture?

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milk

ink

milk of magnesia

sugar solution

_________ shells of noble gases is complete.

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Outer most

2

1

Nil

In common, a solution has ___________ components.

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1

2

3

4

H2O is what type of molecules it is:

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Manoatomic

Polyatomic

Pentaatomic

Nil

The base of modern periodic table is

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Atomic number (Z)

Mass number (A)

Avogadro's Number

Quantum Number

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

A solution whose molarity is known is called:

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Dilute solution

Concentrated solution

Saturated solution

Molar solution

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

The earth is made up of ___________ % of iron.

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4

5

6

7

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

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