Past Paper Agha Khan Board Class IX Chemistry 2013
Past Paper Agha Khan Board Class IX Chemistry 2013
Past Paper Agha Khan Board Class IX Chemistry 2013
Marks: 40
INSTRUCTIONS
Please read the following instructions carefully.
1.
2.
RUBRIC. There are SIX questions. Answer ALL questions. Questions 5 & 6 each offer TWO
choices. Attempt any ONE choice from each.
3.
4.
5.
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Q.1.
a.
(Total 7 Marks)
C 2 H 4 + O 2 CO 2 + H 2 O
i.
(2 Marks)
Balance the given equation using the simplest possible whole numbers.
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ii.
How many moles of oxygen are required to react with 2.5 moles of ethene (C2H4)?
[Hint: Use balanced chemical equation for the calculation]
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b.
Draw the structures of any TWO isotopes of carbon specifying the number of protons, neutrons
and electrons of each.
(2 Marks)
Isotopes of Carbon
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c.
Describe why sodium chloride has high melting and boiling points.
(3 Marks)
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Q.2.
a.
(Total 5 Marks)
Describe why electronegativity of elements increases from left to right in a period and decreases
down a group in the periodic table.
(4 Marks)
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b.
If an element belongs to group 17 and period 3 of the periodic table, what will be its electronic
configuration?
(1 Mark)
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Q.3.
a.
(Total 9 Marks)
Kerosene oil and honey are both liquids. When added to water why does kerosene oil float over
water while honey settles down?
(2 Marks)
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b.
A student added potassium nitrate (KNO3) in water and during dissolution of the salt he/she
observed that the test tube became cold.
i.
(2 Marks)
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ii.
What will happen to the solubility of this salt on increasing the temperature?
(1 Mark)
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c.
i.
(1 Mark)
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ii.
(1 Mark)
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iii.
Show the reactions at cathode and anode using balanced chemical equations.
(2 Marks)
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Q.4.
(Total 4 Marks)
Give reasons for the following statements about metals and non-metals.
i.
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ii.
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iii.
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iv.
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Q.5.
(Total 8 Marks)
EITHER
a.
Write any SIX characteristics in a tabular form distinguishing a compound from a mixture,
giving ONE example of each.
OR
b.
Describe the types of bonds and their formation in the following species. Also give ONE
similarity between their bonds.
i.
A water molecule (H 2 O)
ii.
A hydronium ion (H3O + )
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PLEASE TURN OVER THE PAGE
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Q.6.
(Total 7 Marks)
EITHER
a.
The figure shows an experimental verification of a certain gas law with estimated values. Based
on this experiment, describe the relevant gas law in detail showing mathematical and graphical
representations of it.
OR
b.
What is meant by the term electroplating? Describe in detail the electrolytic refining of impure
copper showing reactions at anode and cathode with the help of chemical equations.
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END OF PAPER
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