Previous Year Paper year:2015 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2015

with Solutions -

#
ICSE Board
Class X Chemistry
Time: 2 hrs Max. Marks: 80
Answers to this Paper must be written on the paper provided separately.
You will not be allowed 10 write during the first 15 minutes.
This time is to be spent in reading the Question Paper.
The time given at the head of this paper is the time allowed for writing the answers.
Section I is compulsory. Attempt any four questions from section II.
The intended marks for questions or parts of questions are given in brackets [ ]

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

#1
Ans : 1.

#1-a
Select from the list the gas that matches the description given in each case:
[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

#1-a-i
This gas is used as a reducing agent in reducing copper oxide to copper.
Ans : ammonia

#1-a-ii
This gas produces dense white fumes with ammonia gas.
Ans : hydrogen chloride

#1-a-iii
This gas is used for welding purposes.
Ans : ethyne

#1-a-iv
This gas is also a saturated hydrocarbon.
Ans : ethane

#1-a-v [5]
This gas has a characteristic rotten egg smell.
Ans : hydrogen sulphide

#1-b
Choose the most appropriate answer for each of the following:

#1-b-i
Among the elements given below, the element with the least electronegativity
is:
A) Lithium
B) Carbon
C) Boron
D) Fluorine
Ans : A

#1-b-ii
Identify the statement which does not describe the property of alkenes:
A) They are unsaturated hydrocarbons
B) They decolourise bromine water
C) They can undergo addition as well as substitution reactions
D) They undergo combustion with oxygen forming carbon dioxide and water.
Ans : C

#1-b-iii
This is not an alloy of copper:
A) Brass
B) Bronze
C) Solder
D) Duralumin.
Ans : C

#1-b-iv
Bonding in this molecule can be understood to involve coordinate bonding.
A) Carbon tetrachloride
B) Hydrogen
C) Hydrogen chloride
D) Ammonium chloride
Ans : D

#1-b-v [5]
Which of the following would weigh the least?
A) 2 gram atoms of Nitrogen.
B) 1mole of Silver
C) ``\pu{22.4 litres}`` of oxygen gas at 1 atmospheric pressure and 273° K
D) ``\ce{6.02 \cdot 10^23}`` atoms of carbon.
[Atomic masses: Ag=108, N=14, O=16, C=12]
Ans : D