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Chemistry

Chemistry
Which of the following fibres catches fire least ?

Rayon
Nylon
Cotton
Terricot

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Chemistry
Which of the following is used to remove rust stains on cloth?

Lime
Oxalic acid solution
Petrol
Kerosene

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Chemistry
For generation of biogas, the materials commonly used are

Crop residues
Forest residues
Animal wastes
Aquatic plants

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Chemistry
An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Helium
Argon
Radon
Krypton

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Chemistry
Which of the following is used to denature ethanol ?

Methyl alcohol
Propyl alcohol
Methane
Phenol

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Chemistry
The smog is essentially caused by the presence of

O2 and O3
Oxides of N and S
O2 and N2
O3 and N2

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