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Chemistry

Chemistry
Which of the following is not a derivative of barbituric acid

Veronal
Equanil
Amytal
Nembutal

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Chemistry
The most suitable unit for expressing nuclear radius is :

Fermi
Nanometre
Micron
Angstrom

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Stable half filled 2p sub level
High nuclear charge
Smaller atomic radius
High bond dissociation energy

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Chemistry
________ gives hardness to stainless steel.

Lead
Carbon
Zinc
Tin

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Chemistry
Which of the following pollutants is main product of automobile exhaust ?

Hydrocarbons
CO2
CO
NO

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Chemistry
A balloon filled with helium rises in air because

Helium pushes down on the air below the balloon
Helium is less dense than air
Air exerts an upward force on the balloon
The balloon is weightless

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