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Chemistry

Chemistry
The most abundant element in the human body is

Oxygen
Iron
Carbon
Nitrogen

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Chemistry
Among the following, carbonate ore of Zinc is

Zincite
Calamine
Sphalerite
Zincblende

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Chemistry
Which of the following elements is not present in stainless steel?

Chromium
Iron
Tungsten
Nickel

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Chemistry
Which of the following is the best fuel in terms of energy released per gram of fuel?

Ethanol
Butane
Methane
Hydrogen

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Chemistry
Which gas is most stable at room temperature

O2
H2
N2
F2

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > Na+ > O2- > F-
Na+ > O2- > N3- > F-
N3- > O2- > F- > Na+
O2- > F- > Na+ > N3-

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