Introduction to Fundamental Concepts of Chemistry - Chapter No 1

Right Answers have been shown below in red color.

1. The standard used for all atomic, molecular, and formula weight of an atom, molecule, and formula unit respectively is:

a) C14
b) H1
c) C12
d) O16

2. The weight of one molecule of CH3OH:

a) 32.0 gm
b) 5.32 x 10-23 g
c) 6.02 x 1023 g
d) 6.02 x 10-23 g

3. An oxide of nitrogen contains 30.4% nitrogen. Its empirical formula is:

a) NO2
b) N2O
c) NO
d) NO3

4. When 40ºC is converted into Kelvin scales its value is:

a) 273 K
b) 303 K
c) 313 K
d) 295 K

5. When 220 K converts into Celsius scale, its value is:

a) 225ºC
b) 530ºC
c) -530ºC
d) -212ºC

6. Temperature of 300 K is equal to Celsius scale of:

a) 250C
b) 270C
c) 480C
d) 320C

7. The empirical formula of glucose is:

a) C6H12O6
b) C3H6O3
c) CH2O
d) CHO

8. The empirical formula of sulphuric acid is:

a) HSO
b) HSO4
c) H2SO4
d) H2SO2

9. Modern system of measurement is.

a) MKS system
b) Cus system
c) SI system
d) Fbs system

10. One gram is equal to.

a) .01kg
b) .001kg
c) .0001kg
d) none of above

11. A substance in which all atoms are chemically identical having the same atomic number is called.

a) element
b) compound
c) matter
d) mixture

12. A substance of definite composition of weight consists of atoms of two or more different elements are called.

a) element
b) compound
c) mixture
d) none of above

13. A substance consists of two or more pure substances not chemically combined with each other.

a) compound
b) mixture
c) element
d) none of above

14. A change in which the chemical composition of a substance does not change.

a) temporary change
b) physical change
c) chemical change
d) none of above

15. Which is a physical change.

a) burning of candle
b) burning of coal
c) burning of wood
d) none of above

16. The change in which the making and breaking of bonds are involved is called.

a) structural change
b) chemical change
c) physical change
d) none of above

17. The formula which gives the actual number of atoms of an element in a molecule is called.

a) molecular formula
b) empirical formula
c) unit formula
d) none of above

18. Formula of sodium phosphate.

a) Na3PO2
b) Na3PO4
C) Na2PO2
d) Na2po4

19. The formula of magnesium nitrate is.

a) MgNO3
b) Mg(NO3)2
c) Mg2(NO3)2
d) Mg2NO3

20. Formula of ferric oxide.

a) FeO
b) Fe2O3
c) Fe3O2
d) none of above

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