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Chemistry 9th Class English Medium Online Test MCQs With Answers
Question # 1
The enthalpy of reaction 2H2 +O2-----2H2O
Choose an answer
-571.6 kJ
-110.5 kJ
-393.5 kJ
+53.8 kJ
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Question # 2
If the Delta H value is negative then reaction witll be
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Endotermic
Exothermic
May or may not be exothermic or endothermic
None of these
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Question # 3
A base is a substance which neutralizes an acid. Which of these substances is not aa base.
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Aqueious ammonia
Calcium oxide
sodium Chloride
Sodium carbonate
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Question # 4
How many blocks are presnt in modern periodic table
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2
3
4
5
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Question # 5
Main group elements are arranged in ..............groups.
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7
6
8
10
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Question # 6
When new bonds ae formed, the energy is
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Consume
Remain same
Release
None of these
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Question # 7
How many number of moles are equivalent to 8 gram of CO2.
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0.18
0.15
0.24
0.21
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Question # 8
Which of the following is an exampel of polar covalent compound.
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Cl2
H2
O2
HCl
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Question # 9
--------------- acts a catalyst promoting the breakdown of ozone.
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I2
Br2
Cl2
None
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Question # 10
Building block of all matter is.
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element
Compound
Mixture
Atom
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Question # 11
Number of protons in the nucleus of an atom is called.
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Atomic number
Mass Number
Mass Unit
Electron Number
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Question # 12
-------------acts are reserve energy sources.
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Enzymes
Vitamins
Proteins
Lipids
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Question # 13
Which isotope is used in nuclear reactors.
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U-234
U-235
U-238
All of these
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