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Chemistry 9th Class English Medium Online Test MCQs With Answers
Question # 1
A covalent bond formed by the mutual sharing of two pairs of electrons between bonded atoms is called.
Choose an answer
Signle covalent bond
Double covalent bond
Triple covalent bond
Polar covalent bond
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Question # 2
CaO or lime is used extensive in steel, glass and paper industries. It is produced inan exothermic reversitble reaction by the decompositon of lie . Choose the conditions to produce maximum amount of lime.
Choose an answer
Heating at high temperatur ein an open vessel
Heating at high temperatur ein a closed vessel
Cooling it in a closed vessel
Colling it in an open vessel
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Question # 3
What will hapen to the concentrations of the prodcut if a reversible reaction at eqiulibrium is not distrubed.
Choose an answer
They will keepon increasing
They will keep on decreasing
They will remain constant
They willremain constant for some time and then start decreasing
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Question # 4
The ability of an atom to attract the shared pair of electons towards itself in a molecule is called
Choose an answer
Ionization energy
Electronietativity
Shielding effect
Electron affinity
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Question # 5
All Acids turn blue litmus.
Choose an answer
Pink
White
Colourless
Red
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Question # 6
When acids react with metals which gas is evolved?
Choose an answer
O2
N2
Cl2
H2
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Question # 7
Aerobic respiration releases........energy than anaerobic respiration.
Choose an answer
Equal
Less
More
None of these
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Question # 8
Who use the word energy for the 1st time
Choose an answer
Rutherford
Bohr
Thomas Young
None of these
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Question # 9
Whcih of the following atoms obey duplet rule.
Choose an answer
O
2
Cl
2
H
2
Li
2
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Question # 10
If the Delta H value is negative then reaction witll be
Choose an answer
Endotermic
Exothermic
May or may not be exothermic or endothermic
None of these
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Question # 11
John Dalton put forward his atomic theory.
Choose an answer
1800
1803
1805
1903
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Question # 12
The boiling point of water is
Choose an answer
O
o
C
100
o
C
35
o
C
25
o
C
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Question # 13
How many elements are present in 1st period.
Choose an answer
1
2
8
18
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