Chemistry 2011 | Study Mode

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Question 1
A
calcium hydroxide or magnesium hydroxide 
B
calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI) 
C
sodium hydroxide or magnesium ydroxide 
D
calcium chloride or sodium chloride salts 
Explanation.
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Salts of Calcium and Magnesium are responsible for hardness of water. Bicarbonates, Carbonates, Chlorides and Sulphates of Calcium and Magnesium causes temporary and permanent hardness.


Correct Option:
B
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Question 2
A
Xenon 
B
Neon 
C
Helium 
D
Argon 
Explanation.
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Argon, with the symbol Ar which is the third noble gas, in group 18 makes up about 1% of the Earth's atmosphere, making it the most common noble gas on Earth.


Correct Option:
D
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Question 3
A
undergoes reduction 
B
serves as the positive electrode 
C
production of electons 
D
uses up electrons 
Explanation.
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If an external electrical conductor connects the copper and zinc electrodes, zinc from the zinc electrode dissolves into the solution as Zn2+ ions (oxidation), releasing electrons that enter the external conductor.


Correct Option:
C
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Question 7
A
move at different speeds in the column 
B
dissolve in each other in the column 
C
react with the solvent in the column 
D
react with each other in the column 
Explanation.
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No official Explanation yet!


Correct Option:
A
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