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CHEMISTRY

Chemistry
Among the following, carbonate ore of Zinc is

Sphalerite
Zincite
Zincblende
Calamine

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Chemistry
The metal used for making aircrafts and rockets is

Aluminium
Nickel
Lead
Copper

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

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

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Chemistry
The length of double bond is _______ than single bond

Of same lenght
Longer
Shorter
None of these

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Chemistry
An example of heterocyclic compound is

Benzene
Furan
Anthracene
Naphthalene

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