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Chemistry

Chemistry
Which of the following pollutants is main product of automobile exhaust ?

CO2
Hydrocarbons
CO
NO

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Chemistry
The most suitable unit for expressing nuclear radius is :

Micron
Nanometre
Fermi
Angstrom

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Chemistry
Wax used for making candle is chemically a mixture of

Cyclic hydrocarbons
Aromatic hydrocarbons
Aliphatic hydrocarbons
Aliphatic and aromatic hydrocarbons

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Chemistry
The oxidation number of nickel in K4[Ni(CN)4] is

4
8
Zero
–4

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Chemistry
Mercury is emitted into air by

Burning garbage
Burning coal
Coal fire
Steam engine

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Chemistry
Which one of the following elements is an example of noble gas ?

Chlorine
Hydrogen
Helium
Nitrogen

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