Previous Year Paper year:2012 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2012

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Board Paper 2012
ICSE Board
Class X Chemistry
Board Paper - 2012
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]
Name the gas in each of the following:

#1-a-i
i. The gas evolved on reaction of aluminium with boiling concentrated caustic alkali
solution.
Ans : Hydrogen

#1-a-ii
ii. The gas produced when excess ammonia reacts with chlorine.
Ans : Nitrogen

#1-a-iii
iii. A gas which turns acidified potassium dichromate clear green.
Ans : Sulphur dioxide

#1-a-iv
iv. The gas produced when copper reacts with concentrated nitric acid.
Ans : Nitrogen dioxide

#1-a-v
v. The gas produced on reaction of dilute sulphuric acid with a metallic sulphide.
Ans : Hydrogen sulphide

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

#1-b-i
i. Excess ammonium hydroxide solution is added to lead nitrate solution.
Ans : Insoluble chalky white ppt of lead hydroxide is obtained.

#1-b-ii
ii. Bromine vapours are passed into a solution of ethyne in carbon tetrachloride.
Ans : Reddish brown colour of bromine water disappears.

#1-b-iii
iii. A zinc granule is added to copper sulphate solution.
Ans : The blue colour of copper sulphate solution disappears.

#1-b-iv
iv. Zinc nitrate crystals are strongly heated.
Ans : Reddish brown fumes of nitrogen dioxide a colourless gas that rekindles a glowing splint are released. In the test tube, a ppt is left which is yellow when hot and white when cold.

#1-b-v
v. Sodium hydroxide solution is added to ferric chloride solution at first a little and
then in excess.
Ans : Insoluble reddish brown ppt obtained.