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Chemistry

Chemistry
The main source of Naphthalene is

Diesel
Camphor
Charcoal
Coal-tar

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Chemistry
Which one of the following forms of phosphorus is most reactive?

White phosphorus
Violet phosphorus
Red phosphorus
Black phosphorus

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Chemistry
Pyrethrin used in mosquito coil is obtained from

A fungus
A seed plant
An insect
A bacterium

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Chemistry
The most abundant element is

Silicon
Nitrogen
Oxygen
Calcium

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Chemistry
Wax used for making candle is chemically a mixture of

Aromatic hydrocarbons
Aliphatic and aromatic hydrocarbons
Aliphatic hydrocarbons
Cyclic hydrocarbons

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Chemistry
PH value between 6.5-7.5 makes the soil

None of these
Basic
Neutral
Acidic

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