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Chemistry

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

Bauxite
Cryolite
Calcite
Haematite

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Chemistry
Which of the following is used as anesthetic ?

N2O
NO
NH3
NO2

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Chemistry
Gobar gas mainly contains

Hydrogen sulphide
Carbon monoxide
Methane
Carbon dioxide

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Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

1
4
3
2

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

narcotics
genuine coins from counterfeit coins
contrabands
lead in bullets

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Chemistry
Which of the inert gases can form compounds?

Helium
Krypton
Xenon
Argon

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