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Chemistry

Chemistry
What is the principal ore of aluminium ?

Dolomite
Bauxite
Lignite
Copper

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Chemistry
Terylene is a condensation polymer of ethylene glycol and which acid?

Salicylic acid
Terephthalic acid
Benzoic Acid
Phthalic acid

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Chemistry
Helium gas is filled in ballons because

It is a noble gas
It is lighter than air
It is one of the constitutents of water
Its atomic number is 2

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Chemistry
The items amenable to detection by soft x-rays are

genuine coins from counterfeit coins
lead in bullets
contrabands
narcotics

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Chemistry
Diamond is lustrous because

Its refractive index is high
It is pure
It is colourless
It is hard

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Sedimentation
Flocculation
Water softening
Filtration

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MORE MCQ ON Chemistry

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