Question # 1

Atoms as a whole is _________

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+

_

No

Neutral

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

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Carbon monoxide

Oxygen

Nitrogen

Argon

105 elements were discovered by the year ________________

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1984

1974

1086

1996

All chemists invented all except:

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Beakers

Spirit lamp

Funnels

Retorts

The valency of nitrogen is

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1

2

3

4

_________ shells of noble gases is complete.

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Outer most

2

1

Nil

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

One carbon is _________ times heavier than hydrogen.

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12

13

14

15

The atomic number is represented by ____________

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A

Y

X

Z

The molecular mass of water is

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16 amu

14 amu

18 amu

20 amu

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

There are _________ elements found till now .

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120

118

119

117

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