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Class 9 Science
Atoms And Molecules
Quiz 1
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The chemical symbol for sodium is
0%
So
0%
Sd
0%
NA
0%
Na
Explanation
Na
Which of the following would weigh the highest?
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0. 2 mole of sucrose (C
0%
2 moles of CO
0%
2 moles of CaCO
0%
10 moles of H
Explanation
2 moles of CaCO
Which of the following correctly represents 360 g of water?
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(i)
0%
(i) and (iv)
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(ii) and (iii)
0%
(ii) and (iv)
Explanation
(ii) and (iv)
42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are
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6. 68 × 10
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6. 09 × 10
0%
6. 022 × 10
0%
6. 022 × 10
Explanation
6. 68 × 10
A change in the physical state can be brought about
0%
only when energy is given to the system
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only when energy is taken out from the system
0%
when energy is either given to, or taken out from the system
0%
without any energy change
Explanation
when energy is either given to, or taken out from the system
The relative molecular mass of Na
2
S
2
O
3
.5H
2
O is
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250 amu
0%
250 g
0%
248 amu
0%
248 g
Explanation
248 amu
5H
0%
250 amu
0%
250 g
0%
248 amu
0%
248 g
Explanation
248 amu
Which of the following has maximum number of atom?
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18 g H
0%
18 g of O
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18 g of CO
0%
18 g of CH
Explanation
18 g of CH
Percentage of calcium in calcium carbonate is
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40
0%
30
0%
48
0%
36
Explanation
40
Which has maximum number of molecules?
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1 g of CO
0%
1 g of N
0%
1 g of H
Explanation
1 g of H
What mass of carbon dioxide (CO
2
) will contain 3.011 × 10
23
molecules?
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11. 0 g
0%
22. 0 g
0%
4. 4 g
0%
44. 0 g
Explanation
22. 0 g
The value of Avogadro’s constant is:
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6. 0 × 10
0%
6. 01 × 10
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6. 022 × 10
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6. 022 × 100
Explanation
6. 022 × 10
How many times an atom of sulphur is heavier than an atom of carbon?
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32 times
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12 times
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8/3 times
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12/32 times
Explanation
8/3 times
Which of the following represents 12 u?
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Mass of 1 hydrogen atom
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Mass of C-12 atom
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Mass of 0-16 atom
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1/12th of mass of C-12 atom.
Explanation
1/12th of mass of C-12 atom.
The molecule having an atomicity of 4 is:
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Sulphate molecule
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Ozone molecule
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Phosphorus molecule
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Methane molecule
Explanation
Phosphorus molecule
Which of the following has maximum number of atoms?
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18 g of H
0%
18 g of O
0%
18 g of CO
2
0%
None of the above
Explanation
18 g of CO
0 h : 0 m : 1 s
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