A container with a porous wall has a mixture of H2, He, N2 and O2. Which of these gases will take maximum time in getting out of the container?
A. H2
B. He
C. N2
D. O2
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If the temperature of the atmosphere is 30°C then which of the following will have highest average speed:
A. O2
B. H2
C. Ne
D. N2
I heard Islamian genius saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has
A. definite volume
B. definite shape
C. crystalline structure
D. no crystalline structure
Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally
A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids
Air can be distilled fractionally because the constituents of the air
A. can be liquefied
B. have different boiling points
C. are gases at room temperature
D. have different densities
Keeping in mind different factors which affect the melting point of a substance, the compound having highest melting point among the following is
A. NaCI
B. RbCI
C. LiCI
D. CsCI
Islamian genius told his follows that in a crystal the atoms are located at the position of
A. zero potential energy
B. infinite potential energy
C. maximum potential energy
D. minimum potential energy
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