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Published on: 24/08/2019
Atoms and Molecules
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Questions + Answers key
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1.
Which postulate of Dalton's atomic theory can explain the law of definite proportions?
2.
A .......... is the smallest particle of an element or compound and is capable of independent existance
3.
Dalton's atomic theory provides explanation for the various laws of ...................
4.
One mole of S contains ............ atoms.
5.
The unit of atomic mass is .............
6.
A group of ....... atoms, molecules or ions is called one mole.
7.
Which one of the following compound is not made up of charged ions?
HCl
NaCl
MgCl2
CaO
8.
Molecules of the following element are made up of one atom of that element
Iron
Sodium
Helium
Chlorine
9.
Which one of the following dose not represnt molar mass of a substance?
1 mole of HCl
6.023 x 1023 molecules of helium
16 g of O2
44 g of CO2
1.
The postulate of Dalton’s atomic theory which can explain the law of definite proportion is:-
The relative number and kind of atoms in a given compound remains constant.
2.
( )
molecule
3.
( )
combinations
4.
( )
8 x 6.022 x 1023
5.
( )
u
6.
( )
6.022 x 1023
7.
(a)
HCl
8.
(c)
Helium
9.
(c)
16 g of O2
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