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10th Class Chemistry English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
When copper pyrite (CuFeS2) is strongly heated in excess of airit converted into mixture of:
Choose an answer
Cu2S + Cu2O
Cu2O +FeS
Cu2S + FeS
FeO + SO2 + Cu2S
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Question # 2
The carbon contents in lignite is.
Choose an answer
80%
50%
60%
70%
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Question # 3
Active mass is expressed as:
Choose an answer
{ }
[ ]
( )
l l
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Question # 4
One H
2
O molecule can form hydrogen bonding with how many other H
2
O molecules?
Choose an answer
One
Two
Three
Four
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Question # 5
What percentage of nitrogen and oxygen is in the atmosphere.
Choose an answer
69%
79%
9%
89%
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Question # 6
Formula of baking soda is.
Choose an answer
Na
2
CO
3
NaHCO
3
Na
2
SO
4
Na
2
PO
4
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Question # 7
In an irreversible reaction dynamic equilibrium:
Choose an answer
Never establishes
Established before the completion of reaction
Establishes after the completion of reaction
Establishes readily
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Question # 8
The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:
Choose an answer
hydrogen
oxygen
chlorine
nitrogen
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Question # 9
Concentration is a .
Choose an answer
Mixing technique
Separating technique
Boiling technique
cooling technique
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Question # 10
Who proposed "Law of mass action"?
Choose an answer
Newton
Boyle
Guldberg and waage
Lavoisier
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Question # 11
In the troposphere (lowest layer), the temperature decreases form 17°C to;
Choose an answer
-58°C
-93°C
-61°C
-49°C
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Question # 12
Water molecule has a structure:
Choose an answer
Ionic
Non polar
Tetrahedral
Polar
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Question # 13
Which gas is produce by the electrical lightening of air.
Choose an answer
NO
SO
2
SO
3
CO
2
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