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Chemistry

Chemistry
Ruby and sapphire are oxides of

Tin
Copper
Aluminium
Iron

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Chemistry
Which among the following coal contains 90 per cent of carbon?

Peat
Lignite
Bitumen
Anthracite

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Chemistry
An acid having basicity one is

Sodium dihydrogen phosphate
Phosphoric acid
Disodium hydrogen phosphate
Sodium phosphate

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Chemistry
Two electrons in an orbital are differentiated by which of the following ?

Azimuthal quantum number
Magnetic quantum number
Principal quantum number
Spin quantum number

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Chemistry
The rusting of iron is a/an

Electrochemical change
Physical change
Electrical change
None of these

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Chemistry
Slag is a name given for

Molten iron
Molten calcium silicate
Molten sand
Molten alumina

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