MEDIUM
9th CBSE
IMPORTANT
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Why has the symbol '' been replaced by ?
(a)Atomic mass unit is of the mass of an atom of isotope
(b)Atoms of an element have the same mass
(c)To avoid an ambiguity whether to take as the reference or average mass of isotopes of -atoms
(d)None of the above

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Important Questions on Atoms and Molecules
MEDIUM
9th CBSE
IMPORTANT
What do you understand by Gram Molar Volume?

EASY
9th CBSE
IMPORTANT
What is Avogadro's number?

MEDIUM
9th CBSE
IMPORTANT
What do you understand by polyatomic cation?

MEDIUM
9th CBSE
IMPORTANT
How do you define mole in terms of mass?

HARD
9th CBSE
IMPORTANT
Which of the following has maximum number of atoms?

HARD
9th CBSE
IMPORTANT
Which of the following would weigh the highest?

MEDIUM
9th CBSE
IMPORTANT
A change in the physical state can be brought about

MEDIUM
9th CBSE
IMPORTANT
Calculate the number of moles of magnesium present in a magnesium ribbon weighing . The molar atomic mass of magnesium is (raise to the power - )
