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Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 9
1.
The mass of one Mole of Oxygen and one Mole of Hydrogen atoms/molecules is the same.
a) True
b) False
2.
The Molar Mass of Hydrogen atoms refers to the mass of one Mole of Hydrogen ___________.
a) particles
b) Gas
c) Atoms
d) Molecules
3.
Molar Mass of Hydrogen atoms are 1.008g and that of molecules is?
a) 1.008g
b) 2.016g
4.
In a chemical equation reactants and products are separated by _______?
a) Two lines
b) An arrow
c) Two arrows
5.
A chemical equation must obey the law of ________
a) Gravitational Force
b) Conservation of mass
c) Products and reactions
d) Formula Units
6.
To balance a chemical equation, coefficients are inserted with ___?
a) Products and reactions
b) Reactions only
c) None is correct.
d) Products only
7.
While balancing a chemical equation chemical formulas of elements and compounds can be changed.
a) False
b) True
8.
What are co-efficients of chemical equation in (2H
2
S(g)+SO
2
(g) ------> 2H
2
O (1) + 3S(s)
a) (g), (g), (I) & (S)
b) 2,1,2 and 3
c) Fig 2, 2 and 2
9.
A chemical equation is first balanced by______?
a) Inserting Coefficient
b) Inspecting it
c) Writing it correctly
10.
In balancing chemical equation, inspection method and trial and error method is one and the same.
a) False
b) True
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