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Chemistry

Chemistry
The scientist who experimentally proved the existance of positron is

Bethe
Fermi
Bohr
Anderson

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Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

1
3
2
4

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Chemistry
Which one of the following is used as a sowing agent in the preparation of soft drinks?

Salicylic acid
Phosphorus acid
Boric acid
Phosphoric acid

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Chemistry
Domestic cooking gas consists mostly of

Liquified butane and isobutane
Methane and ethane
Ethylene and carbon monoxide
Hydrogen and acetylene

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Chemistry
The total energy of revolving electron in an atom

Can never be positive
Will always be positive
Can have any value above zero
Cannot be negative

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Chemistry
The element used for making solar cells is

Silicon
Magnesium
Sodium
Calcium

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