Previous Year Paper year:2013 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2013

with Solutions -

#
Board Paper 2013
ICSE Board
Class X Chemistry
Board Paper - 2013
Time: 1.5 hrs Total Marks: 80
General Instructions:
1. Answers to this paper must be written on the paper provided separately.
2. You will NOT be allowed to write during the first 15 minutes. This time is to be spent in
reading the question paper.
The time given at the head of t h i s paper is the time allowed for writing the
answers.
This question paper is divided into two sections.
3. Section I contains one question with parts (a) to (h); all the eight parts are to be
answered.
4. Section II contains six questions numbered 2 to 7. You are to answer any four of these
questions.
The intended marks of questions or for parts of questions are given in brackets [ ].

# [40]
Section : I
Attempt all questions from this section
.

#1

#1-a [5]
From the list given below, select the word(s) required to correctly complete blanks (i)
to (v) in the following passages. The words from the list are to be used only once. Write
the answers as (a) (i), (ii), (iii) and so on. Do not copy the passage.
[ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide,
precipitate, salt, water]

#1-a-i
i. A solution M turns blue litmus red, so it must contain (i) ________
ions; another solution O turns red litmus blue and hence must contain (ii)_____ ions.
Ans : (i.) Hydronium
(ii.)Hydroxide

#1-a-ii
ii. When solution M and O are mixed together, the products will be (iii) _____and (iv)
_________.
Ans : (iii.) Salt
(iv.) Water

#1-a-iii
iii. If a piece of magnesium was put into a solution M, (v)______ gas would be evolved.
Ans : Hydrogen

#1-b [5]
Identify the gas evolved in the following reactions when

#1-b-i
i. Sodium propionate is heated with soda lime.
Ans : Ethane ``\ce{(C2H6)}``

#1-b-ii
ii. Potassium sulphite is treated with dilute hydrochloric acid.
Ans : Sulphur dioxide ``\ce{(SO2)}``

#1-b-iii
iii. Sulphur is treated with concentrated nitric acid.
Ans : Nitrogen dioxide ``\ce{(NO2)}``

#1-b-iv
iv. A few crystals of ``\ce{KNO3 }`` are heated in a hard glass test tube.
Ans : Oxygen ``\ce{(O2)}``

#1-b-v
v. Concentrated hydrochloric acid is made to react with manganese dioxide.
Ans : Chlorine ``\ce{(Cl2)}``

#1-c [5]
State one appropriate observation for each of the following:

#1-c-i
i. Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper
sulphate.
Ans : The blue colour of the solution changes to white.