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Chemistry

Chemistry
The mass of one Avogadro number of helium atom is

4.00 gram
8.00 gram
1.00 gram
4 x 6.02 x 1023 gram

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Chemistry
The presence of Cobalt in Vitamin B12 was established for the first time by

Spectroscopy
Borax-Bead test
Sodium Nitroprusside test
Hydrolysis test

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Chemistry
Which among the following is found in chlorophyll ?

Ca2+
Fe2+
Mg2+
A l3+

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Chemistry
The pair of compounds used as anaesthetic in medicines :

Ether, Ammonia
Nitrous oxide, Chloroform
Nitrogen dioxide, ether
Chloroform, Nitrogen dioxide

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Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Nitrogen
Helium
Oxygen
Hydrogen

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Chemistry
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?

Ethane
Propane
Butane
Methane

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