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CHEMISTRY

Chemistry
Which one is the lightest element in the periodic table

Helium
Hydrogen
Carbon
Oxygen

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Chemistry
Which one of the following is most electronegative

Tin
Carbon
Silicon
Lead

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Chemistry
Periodic table contains how many groups

18
16
17
19

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Chemistry
Total number of elements in the Periodic table

118
127
115
112

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Chemistry
The components of water can be separated by

Chemical methods
Both A and B
Physical methods
They can not be separated

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