Previous Year Paper year:2014 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2014

with Solutions -

#
ICSE Board
Class X Chemistry
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 [10]
Choose the correct answer from the options given below:

#1-a-i
Ionisation potential increases over a period from left to right because the
A. Atomic radius increases and nuclear charge increases
B. Atomic radius decreases and nuclear charge decreases
C. Atomic radius increases and nuclear charge decreases
D. Atomic radius decreases and nuclear charge increases
Ans : (D) Atomic radius decreases and nuclear charge increases.

#1-a-ii
A compound X consists of only molecules. Hence, X will have
A. A crystalline hard structure
B. A low melting point and low boiling point
C. An ionic bond
D. A strong force of attraction between its molecules
Ans : (B) A low melting point and low boiling point.

#1-a-iii
When fused lead bromide is electrolysed, we observe
A. A silver grey deposit at the anode and a reddish brown deposit at the cathode
B. A silver grey deposit at the cathode and a reddish brown deposit at the anode
C. A silver grey deposit at the cathode and reddish brown fumes at the anode
D. Silver grey fumes at the anode and reddish brown fumes at the cathode
Ans : (C) A silver grey deposit at cathode and reddish brown fumes at anode.

#1-a-iv
The main ore used for the extraction of iron is
A. Haematite
B. Calamine
C. Bauxite
D. Cryolite
Ans : (A) Haematite

#1-a-ix
Aluminium powder is used in thermite welding because
A. It is a strong reducing agent.
B. It is a strong oxidising agent.
C. It is corrosion resistant.
D. It is a good conductor of heat.
Ans : (A) It is a strong reducing agent.

#1-a-v
Heating an ore in a limited supply of air or in the absence of air at a temperature just
below its melting point is known as
A. Smelting
B. Ore dressing
C. Calcination
D. Bessemerisation
Ans : (C) Calcination

#1-a-vi
If an element A belongs to Period 3 and Group II, then it will have
A. 3 shells and 2 valence electrons
B. 2 shells and 3 valence electrons
C. 3 shells and 3 valence electrons
D. 2 shells and 2 valence electrons
Ans : (A) 3 shells and 2 valence electrons

#1-a-vii
The molecule containing a triple covalent bond is
A. Ammonia
B. Methane
C. Water
D. Nitrogen
Ans : (D) Nitrogen

#1-a-viii
The electrolyte used for electroplating an article with silver is
A. Silver nitrate solution
B. Silver cyanide solution
C. Sodium argentocyanide solution
D. Nickel sulphate solution
Ans : (C) Sodium argentocyanide solution

#1-a-x
The IUPAC name of acetylene is
A. Propane
B. Propyne
C. Ethene
D. Ethyne
Ans : (D) Ethyne

#1-b
Fill in the blanks from the choices given within brackets: