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Chemistry

Chemistry
Which of the following is used as a lubricant in heavy machines?

Phosphorus
Bauxite
Graphite
Sulphur

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

Soda powder
Borax powder
Alum
Bleaching powder

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Chemistry
Iron filings can be separated from a heterogenous mixture using the technique of :

Sedimentation
Sublimation
Magnetization
Evaporation

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Chemistry
Which one is the most dense liquid from the below

Water
Choloform
None of these
Gasolin

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Chemistry
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

From blue to pink
From pink to blue-green
From brown to blue-black
From brown to orange-red

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Chemistry
Citric acid is present in free form in

Lemon
Milk
Tamarind
Apple

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