question_answer1) When
do zeros present in a number become insignificant?
question_answer2) Is
velocity a basic or derived quantity according to S.I. system?
question_answer5) Why
is distilled water a compound while tap water a mixture?
question_answer7) When
is the law of definite proportions not obeyed?
question_answer8) Which
law co-relates the mass and volume of a gas?
question_answer9) Atomic
mass of oxygen is 16 u. What does its indicate?
question_answer10) An
element has fractional atomic mass. What does it indicate?
question_answer11) What
is the difference between the mass of a molecule and molecular mass?
question_answer12) Where
do we use the words mole and mol?
question_answer14) What
is the basic difference between empirical and molecular formulae?
question_answer16) Why
is it necessary to balance a chemical equation?
question_answer17) In
the combustion of methane, why is methane regarded as the limiting reactant?
question_answer18) What
is the difference between molarity and molality?
question_answer20) Why is air sometimes considered
as a heterogeneous mixture?
question_answer27) 1 L of a gas at S.T.P. weighs 1.97
g. What is the vapour density of the gas?
question_answer29) Why atomic masses are the
average values?
question_answer30) Why are the atomic masses of
most of the elements fractional?
question_answer31) What is die difference between
the mass of a molecule and gram molecular mass?
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