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CHEMISTRY

Chemistry
Which one is the lightest element in the periodic table

Carbon
Oxygen
Hydrogen
Helium

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Chemistry
Which one of the following is most electronegative

Carbon
Tin
Lead
Silicon

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Chemistry
Periodic table contains how many groups

16
17
18
19

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Chemistry
Total number of elements in the Periodic table

115
127
118
112

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Chemistry
The components of water can be separated by

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

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