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

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

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

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 4
A
enthalpy
B
enthalpy change
C
activation energy
D
activated complex
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 5
A
geometric isomerism
B
optical isomerism
C
structural isomerism
D
positional isomerism
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 6
A
A
B
B
C
C
D
D
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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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

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A

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