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Chemistry

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

Ethane
Methane
Butane
Propane

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Chemistry
Which one of the following organic compounds has fruity smell?

Aldehyde
Ether
Alcohol
Ester

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Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

2
4
1
3

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Chemistry
Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure

Bromine
Magnesium
Lead
Barium

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

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

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Chemistry
The major harmful gas emitted by automobile vehicle which causes air pollution is

Carbon Monoxide
Ozone gas
Carbon dioxide
Methane

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