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Chemistry

Chemistry
Which one is the simplest form of alkane

Decane
Butane
Propane
Methane

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Chemistry
An electric iron has a heating element made of :

Zinc
Nichrome
Tungsten
Copper

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Chemistry
Cement is formed by strongly heating a mixture of

Limestone and graphite
Chalk and graphite
Limestone and clay
Clay and graphite

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

Calcium
None of these
Magnesium
Manganese

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Chemistry
Which one of the following mineral does not contain oxygen ?

Bauxite
Calcite
Haematite
Cryolite

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Chemistry
Gold dissolves in

Acetic acid
Nitric acid
Aqua-regia
Hydrochloric acid

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