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Atoms and Molecules

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Atoms and Molecules

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Question 1
100 ml of oxygen gas and 100 ml of  nitrogen gas at normal temperature and pressure contain ................
A
equal number of atoms
B
equal number of molecules
C
oxygen gas has more number of atoms than nitrogen gas
D
nitrogen gas has more number of atoms than oxygen gas
Question 2
Identify the monatomic and diatomic species from the following pairs .............
A
helium and neon
B
hydrogen and chlorine
C
chlorine and ozone
D
helium and oxygen
Question 3
The molecular mass of chlorine is 71 and its atomic mass is 35.5. The atomicity of chlorine is ........................
A
1
B
2
C
3
D
cannot be predicted
Question 4
the atomic mass of sulphur is 32. It has atomicity 8. The molecular mass of sulphur is .............
A
32
B
256
C
4
D
42
Question 5
Isobars are ..................
A
atoms of the same element with same atomic number but different mass number
B
atoms of different elements having the same mass number but different atomic number
C
atoms of different elements with the same number of neutrons
D
atoms of different elements having the same atomic number and different mass number
Question 6
6C14 and 7N14 are examples of ........................
A
isotopes
B
isobars
C
isotones
D
isosters
Question 7
Which of the following statement truly reflect the definition of atom and molecule?
A
atoms are unstable and do not exist free whereas molecules exist free
B
atoms of polyatomic molecules do not exist free whereas molecules exist free
C
atoms of all types of molecules and molecules exist free
D
monoatomic elementary molecule and molecules do not exist free
Question 8
Which of the following have independent existence?
A
an atom of nitrogen
B
an atom of helium
C
a molecule of chloride
D
both (ii) and (iii)
Question 9
Which of the following pairs constitute an elementary molecule?
A
hydrogen and chlorine
B
water and nitric oxide
C
methane and water
D
Hydrogen and water
Question 10
Identify the pair which consists of a homoatomic molecule and a hetero atomic  molecule ................
  1. nitrogen and ammonia
  2. nitrogen and oxygen
  3. oxygen and water
  4.  chlorine and nitrogen
A
1 and 2
B
1 and 3
C
3 and 4
D
1 and 4
Question 11
Which of the following has highest mass in grams?
A
1 atom of silver
B
1 mol of nitrogen
C
1 mol of calcium
D
2 g of sodium
Question 12
Which among the following will contain the same number of atoms of oxygen and other element in one mole of that substance .......................
  1. carbon monoxide
  2.  nitrous oxide
  3. nitrogen dioxide
  4. carbon-dioxide
A
1 and 2
B
3 and 4
C
1 and 3
D
2 and 4
Question 13
The volume occupied by 2 mol of nitrogen dioxide at STP is ..................
A
22.41
B
44.821
C
2.2421
D
4.4821
Question 14
One mole of the oxygen gas has the volume of ........................
A
1 L of oxygen a STP
B
32 L of oxygen a STP
C
22.4 L of oxygen a STP
D
none
Question 15
How many moles are represented by 36g of water?
A
1
B
2
C
3
D
4
Question 16
What is the mass of 4.48 x 10-2m3 of Methane gas at STP?
A
16 g
B
32 g
C
48 g
D
54 g
Question 17
Gram molecular mass of nitrogen is ....................
A
23
B
14
C
7
D
none
Question 18
The gram-atomic mass of chlorine is ......................
A
35.5 g
B
35.5 kg
C
3.55 g
D
3.55 kg
Question 19
4.25 g of ammonia is equal to ....................
A
0.25 mole
B
1 mole
C
1.5 mole
D
0.5 mole
Question 20
Which of the following will contain the mass number of atoms as 20g of calcium?
A
24 g of Mg
B
12 g of C
C
24 g of C
D
12 g of Mg
Question 21
Avogadro number of helium atoms weigh .....................
A
1.00 g
B
4.00 g
C
8.00 g
D
4 x 6.023 x 1023g
Question 22
The mass of 2.24 dm3 of a gas under standard condition is 2.8 g. Its  molar mass is .....................
A
28
B
14
C
42
D
56
Question 23
Atoms of the same elements having similar chemical properties and different physical properties are known as ..................
A
isotopes
B
isobars
C
isotone
D
isochors
Question 24
The species that take part in chemical reactions are ..................
A
atoms
B
molecules
C
electrons
D
protons
Question 25
The ratio of atoms in a molecule of H2SO4 is ..................
A
2:1:4
B
2:2:4
C
1:1:1
D
2:2:3
Question 26
.................. is the name given to a process where atoms of one element is changed to atoms of another element.
A
disintegration
B
transmutation
C
atomisation
D
combination
Question 27
Tri atomic molecules contain ......................... number of atoms.
A
three
B
four
C
two
D
six
Question 28
The molecular mass of an atom is 32 and its atomic mass 8. Its atomicity is ..................
A
4
B
8
C
2
D
3
Question 29
The atomicity of a molecule is 3. Its atomic mass is 16. Its molecular mass is .............
A
48
B
16
C
32
D
18
Question 30
A
A
B
B
C
C
D
D
Question 31
A
1 and 2
B
2
C
2 and 4
D
3 and 4
Question 32
A
A
B
B
C
C
D
D
Question 33
A
A
B
B
C
C
D
D
Question 34
A
A
B
B
C
C
D
D
Question 35
A
A
B
B
C
C
D
D
Question 36
A
A
B
B
C
C
D
D
Question 37
A
A
B
B
C
C
D
D
Question 38
A
A
B
B
C
C
D
D
Question 39
A
A
B
B
C
C
D
D
Question 40
A
A
B
B
C
C
D
D
Question 41
A
A
B
B
C
C
D
D
Question 42
A
A
B
B
C
C
D
D
Question 43
A
A
B
B
C
C
D
D
Question 44
A
A
B
B
C
C
D
D
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There are 44 questions to complete.

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