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Chemistry

Chemistry
The most abundant constituent of atmospheric air is :

Nitrogen
Carbon
Hydrogen
Oxygen

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Chemistry
1 carat of diamond is equal to

200 mg
100 g
200 g
100 mg

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Chemistry
Brass is made of

Copper and zinc
Copper and tin
Tin and lead
Copper, tin and zinc

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Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Helium
Nitrogen
Hydrogen
Oxygen

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Chemistry
Which among the following is found in chlorophyll ?

Ca2+
Mg2+
A l3+
Fe2+

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Chemistry
Yellow Cake' an item of smuggling across border is

Unreformed gold
Uranium oxide
A crude from of cocaine
A crude from of heroin

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