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Chemistry

Chemistry
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?

12
6
18
Zero

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Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Neon
Argon
Krypton
Helium

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Chemistry
Gas released during Bhopal tragedy was :

Sodium isothiocyanate
Potassium isothiocyanate
Ethyl isothiocyanate
Methyl isothiocyanate

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Chemistry
Percentage of carbon in steel ranges from

3.0 to 4.0
1.5 to 3.0
4.0 to 6.0
0.1 to 1.5

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Chemistry
'Atomic theory' of matter was given by

Avogadro
Newton
Dalton
Pascal

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Chemistry
What material is used to make electric heater coil ?

Nichrome
Silver
Copper
Iron

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