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Chemistry

Chemistry
The octane number of zero is assigned to

2-methyl octane
n-heptane
iso-octane
3-methyl octane

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Chemistry
Which of the following metals causes Itai-Itai disease ?

Copper
Cadmium
Chromium
Cobalt

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Chemistry
Which of the following fuels causes minimum environmental pollution?

Diesel
Hydrogen
Kerosene
Coal

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Chemistry
Which of the following is not a nitrogenous fetiliser?

Ammonium nitrate
Superphosphate
Urea
Ammonium sulphate

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Chemistry
Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

Magnesium
Manganese
None of these
Calcium

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Chemistry
An emulsifier is an agent which

Homogenises an emulsion
Stabilises an emulsion
Accelerates the dispersion
Aids the flocculation of an emulsion

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