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Chemistry

Chemistry
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?

Hydrogen
Methane
Helium
Nitrogen

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Chemistry
Choose the incorrect statement pertaining to organic compounds

They are not easily combustible
They have low melting and boiling points
They do not dissolve in water
They contain mainly carbon and hydrogen

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Chemistry
The National Chemical Laboratory (India) is located in

Mumbai
Pune
Bangaluru
Hyderabad

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Chemistry
Magnetite is

Fe3O4
2Fe2O3. 3H2O
FeCO3
Fe2O3

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Chemistry
Ruby and sapphire are oxides of

Iron
Copper
Tin
Aluminium

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Chemistry
Asbestos is formed of :

Calcium and Zinc
Calcium and Magnesium
Lead and Iron
Copper, Zinc and Manganese

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