Chemistry - 9 Chapter - 2Chemical combination and Chemical EquationsTest - 14

Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 14

1. amu stands for?

a) atomic mass unit
b) atomic mole unit
c) atomic molecule unit

2. Who helped us in finding the weight of reactants in grams?

a) Dalton a British Scientists
b) Avogadro an Italian scientist
c) Antione Lavoisier

3. There will be how many grams in one mole of Oxygen and Hydrogen?
a) H = 1.008g, O = 16g
b) H = 1.008g, O = 18g
c) H = 1.08g, O = 16g
d) H = 1.0008g, O = 16g

4. There will be how many atoms on one mole of Oxygen and carbon?

a) Oxygen 6.02x10²³ atoms and Carbon 6.02x1023 atoms.
b) Oxygen 6.022x10²³ atoms and Carbon 6.022x10²³ atoms.
c) Oxygen 6.02x10²³ atoms and Carbon 6.02x10^23 atoms.
d) Oxygen 6.02x10²³ atoms and Carbon 6.02x1023 atoms.

5. The number of particles in one mole of substance is fixed which is called Avogadro's number. Its value is 6.022x10²³ it is called?

a) Triades
b) Alchemi
c) Avogadro number
d) mole

6. How number of atoms or molecule can be found with the help of Avogadro number?

a) Number of molecules = No of moles / Avogadro number.
b) Number of molecules = No of moles - Avogadro number.
c) Number of molecules = No of moles x Avogadro number.
d) Number of molecules = No of moles + Avogadro number.

7. The quantity of an element or a compound which contains Avogadro's number is called?

a) Triades
b) Avogadro number
c) mole

8. John Dalton theory was based on Law of conservation of mass Law of multiple proportions.

a) False
b) True

9. john Dalton predicted Laws of multiple and reciprocal proportions.

a) True
b) False

10. laws of chemical combination explain gen features of a physical change.

a) True
b) False

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