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Chemistry

Chemistry
The purest form of water in nature is

River water
Lake water
Rain water
Sea water

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Chemistry
Among the following, carbonate ore of Zinc is

Zincite
Sphalerite
Calamine
Zincblende

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Chemistry
Emulsifier is an agent which

Aids the flocculation of emulsion
Accelerates the dispersion
Homogenizes the emulsion
Stabilizes an emulsion

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

200
50
500
100

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Chemistry
The chemical used in developing photographic films is

Silver bromide
Sodium sulphate
Hydroquinone
Hypo

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

–4
Zero
8
4

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