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Chemistry

Chemistry
Among the following the hardest metal is

Gold
Tungsten
Platinum
Iron

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Chemistry
The inert gas used as beacon light is

Ar
He
Kr
Ne

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Chemistry
An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Argon
Krypton
Radon
Helium

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Chemistry
Peroxyacetyl nitrate is a

Acidic dye
Vitamin
Secondary pollutant
Plant hormone

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Chemistry
The compound that has the least value for octane number is :

Iso-octane
N-heptane
2-methyl heptane
2,2-dimethyl hexane

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Chemistry
Which among the following is found in chlorophyll ?

Mg2+
Ca2+
A l3+
Fe2+

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