Question # 1

The third abundant as found in the earth' crust is:

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Carbon monoxide

Oxygen

Nitrogen

Argon

Which one an example of heterogeneous mixture?

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Ice cream

Concrete

Both a & b

NiL

The valency of nitrogen is

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1

2

3

4

Mass no is represented by :

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A

B

C

D

___________ is a pure substance that can be broken down.

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Matter

Element

Mass

Mixture

There are _________ types of bonds.

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1

2

3

4

The atomic number is represented by ____________

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A

Y

X

Z

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

_____________ revolves in orbits around nucleus.

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Electron

Proton

Neutrons

Nil

The formula of benzene is _________

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C6H6O3

C6H6

C12H22

Nil

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

How many numbers of moles are equivalent to 8 grams of CO₂?

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0.15

0.18

0.21

0.24

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