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Chemistry

Chemistry
Petroleum consists of a mixture of

Hydrocarbons
Carbohydrates
Carbides
Carbonates

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Chemistry
The method that cannot be used for removing permanent hardness of water is

distillation
adding caustic soda
boiling
adding sodium carbonate

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Chemistry
Commonly used antiseptic 'Dettol' is a mixture of

O-cresol + terepineol
Phenol + terepineol
O-chlorophenoxylenol + terepineol
Chloroxylenol + terepineol

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Chemistry
Which one of the following is extensively used for sterilizing water ?

Soda powder
Alum
Borax powder
Bleaching powder

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Chemistry
Which one of the following organic compound is used to remove stains of iron compounds?

Phthalic acid
Cinnamic acid
Oxalic acid
Benzoic acid

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Chemistry
The third shell of an atom can have a maximum of ______ electrons

21
15
13
18

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