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CHEMISTRY

Chemistry
Among the following, carbonate ore of Zinc is

Calamine
Zincblende
Zincite
Sphalerite

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Chemistry
The metal used for making aircrafts and rockets is

Aluminium
Lead
Nickel
Copper

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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
The length of double bond is _______ than single bond

Shorter
Of same lenght
Longer
None of these

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Chemistry
An example of heterocyclic compound is

Benzene
Anthracene
Naphthalene
Furan

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