question_answer3) Out of dry air and wet air,
which is heavier?
question_answer8) Why are aerated water bottles
kept under water during summer?
question_answer9) Liquid ammonia bottle is cooled
before opening the seal. Explain.
question_answer14) If the value of 'a' for a gas is
zero, can it be liquefied?
question_answer17) What is the basic difference between boiling and evaporation?
question_answer18) Why does the boiling point of
liquid rise on increasing pressure?
question_answer19) Drop of liquid assumes spherical
shape. Why?
question_answer21) Water meniscus in a glass tube
is concave while that of mercury is convex. Why?
question_answer22) Liquids like ether and acetone
are kept in cool places.
question_answer23) Tea or coffee is sipped from a
saucer when it is hot.
question_answer26) If alcohol evaporates on your palm, it
becomes cold. Why?
question_answer27) Arrange solid, liquid and gas in
order of energy, giving reasons.
question_answer28) Why liquids have a definite
volume but no definite shape?
question_answer36) Compare the rates of diffusion
of \[^{235}U{{F}_{6}}\]and\[^{238}U{{F}_{6}}\].
question_answer38) What would have happened to the
gas if the molecular collisions were not elastic?
question_answer48) Why vegetables are cooked with
difficulty at a hill station?
question_answer49) What is the difference between
normal boiling pint and standard boiling point?
question_answer50) Explain why temperature of a boiling
liquid remains constant?
question_answer51) What happens if a liquid is
heated to the critical temperature of its vapours?
question_answer52) Why liquids diffuse slowly as
compared to gases?
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