Chapter - 1 Some basic concepts of chemistry

2. Q1 - The smallest particle of a
substance that shows all the properties
is called :
a) Compound
b) Mixture
c) Element
d) Molecule

3. Q2-Molecular formula of
sugar is :
a)C11H22O12
b)C12H22O11
c)C22H11O12
d)C12H11O22

4. Q3-Molarity of 5.1g NH3 in
500mL water is
a)0.6M
b)6.0M
c)10.2M
d)1.5M

5. Q4 - If molecular mass of H2O is 18
amu ,1.8 gram of H2O contains
molecules :
a)6.022 × 10
b)6.022 × 10
c)6.022 × 10
d)6.022 × 10
24
22
21
23

6. Q5 - The mass of 2 moles
of H2 is :
a)1 gram
b)2 grams
c)4 grams
d)4 amu

7. Q6 - Gram molecular
mass of CO2 is
a)44
b)44 amu
c)44 gram
d)All of above

8. Q7 – If atomic mass of oxygen is
16 amu, mass of 1 mole of O2 is :
a)32 amu
b)16 amu
c)32 grams
d)16 grams

9. Q8 – Volume Of 1.6 Gram
Methane At STP Is :
a)2.24 Liters
b)4.48 Liters
c)11.2 Liters
d)1.12 Liters

10. Q9 - Number of moles
dissolved in one liter is called :
a)Mole fraction
b)Molarity
c) Molality
d)Mass-percentage

11. Q10- Which of the following
compounds contains the highest
percentage of potassium :
a)KNO3
b)KCI
c)K2SO4

12. Q11- Gases have :
a) Definite volume , definite shape and
are not compressible
b) Definite volume , no definite shape
and are highly compressible
c) Definite volume , no definite shape
and are slightly compressible
d) No definite volume, no definite
shape and are highly compressible

13. Q12 - When one substance
contains only one type of
atoms, it is called :
a)Compound
b)Element
c)Mixture
d)molecule

14. Q13 - When the two or more
element combine together , they
form :
a)Compound
b)Element
c)Mixture
d)molecule

15. Q14 - When the two or more
substance are mixed in any ratio ,
they form :
a)Compound
b)Element
c)Mixture
d)molecule

16. Q15 - Air is a/an :
a)Compound
b)Element
c)Mixture
d)molecule

17. Q16 - water is a/an :
a)Compound
b)Element
c)Mixture
d)molecule

18. Q17 - O2 is a/an :
a)Compound
b)Element
c)Mixture
d)molecule

19. Q18 - Solids have :
a) Definite volume , definite shape
and are not compressible
b) Definite volume , no definite
shape and are highly compressible
c) Definite volume , no definite
shape and are slightly
compressible
d) No definite volume, no definite
shape and are highiy compressible

20. Q19 – Liquids have
a) Definite volume , definite shape
and are not compressible
b) Definite volume , no definite shape
and are highly compressible
c) Definite volume , no definite shape
and are slightly compressible
d) No definite volume, no definite
shape and are highly compressible

21. Q20 – Which statement is not correct
for a mixture
a) compound retain their
properties
b) properties of a mixture are
different from its components
c) compound are mixed in any
ratio
d) compound are separated using
simple methods