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- 1. Multiple Choice
Which of the following statements is not true about an atom?
Atoms are always neutral in nature
Atoms are not able to exist independently
Atoms are the basic units from which molecules and ions are formed
Atoms aggregate in large numbers to form the matter that we can see, feel or touch
- 2. Multiple Choice
The chemical symbol for nitrogen gas is
ni
N2
N
NI
- 3. Multiple Choice
The chemical symbol for sodium is
so
SO
Na
NA
- 4. Multiple Choice
Which of the following has maximum number of atoms?
18g of H2O
18g of O2
18g of CO2
18g of CH4
- 5. Multiple Choice
A change in the physical state can be brought about
only when energy is given to the system
only when energy is taken out from the system
when energy is either given to or taken out from the system
without any energy change
- 6. Multiple Choice
molecular formula of copper and bromine is
CuBr2
CUBR
Cu2Br
CuBr
- 7. Multiple Choice
Atomic number of oxygen is
4
6
8
12
- 8. Multiple Choice
valency of helium is
0
3
2
1
- 9. Multiple Choice
chemical formula of aluminium and hydrogen is
aLoH
Al(OH)3
AL(OH)2
AloH
- 10. Multiple Choice
The molecular formula of potassium nitrate is ________.
KNO
KON
KNO3
KNO2
- 11. Multiple Choice
Molecular mass is defined as the:
Mass of one molecule of any substance compared with the mass of one atom of C – 12
Mass of one atom compared with the mass of one atom of hydrogen
Mass of one atom compared with the mass of one molecule
none of these
- 12. Multiple Choice
Atomic mass of sodium is
13
23
21
19
- 13. Multiple Choice
Which of the following represents a correct chemical formula?
BiPO4
NaSO4
NaS
CaCl
- 14. Multiple Choice
to create a chemical formal you need to know
the atomic mass of an element
the mass of an element
valency of an element
all of these
- 15. Multiple Choice
atomic number of hydrogen is
5
7
3
1
- 16. Multiple Choice
who presented the atomic theory
Albert Einstein
John Dalton
Robert Hooke
Marie Curie
- 17. Multiple Choice
what is the symbol of silicon
S
Si
SL
Sc
- 18. Multiple Choice
Atomicity of phosphorus namaste is
monoatomic
Diatomic
poly atomic
tetra atomic
- 19. Multiple Choice
atomic radius is measured in
nanometers
kilometers
meters
centimeters
- 20. Multiple Choice
which of the following is a noble gas
helium
oxygen
aluminium
hydrogen
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