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ICSE CLASS 9 CHEMISTRY SAMPLE PAPER - 1

ICSE Board

Class IX Chemistry

Time: 2 hrs.                                                    Sample Paper                                                    Total Mark: 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)
3. The time given at the head of the paper is the time allotted for writing the answers.
4. Attempt all questions from Section I and any four questions from Section II.
5. The intended marks of questions or parts of questions are given in brackets [ ].

                         

                                                                        SECTION I (40 Marks)
                                                           Attempt all questions from this section


Question 1

a)  Deduce the molecular formula of the following:                                                                                     [5]
i. Ammonium acetate
ii. Lead chromate
iii. Calcium carbide
iv. Aluminum carbide
v. Sodium bicarbonate


b)  Give the chemical names of the following salts:                                                                                      [5]
i. $\mathrm{NaBr}$
ii. $\mathrm{Zn}_{3} \mathrm{P}_{2}$
iii. $\mathrm{CaC}_{2} \mathrm{O}_{4}$
iv. $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{~S}$
v. $\mathrm{AgCl}$

c)  Name the following elements:                                                                                                                     [5] 

i. An element A atomic number 7 mass numbers 14
ii. electronic configuration 2,8,8
iii. electrons 13, neutrons 14
iv. Protons 18 neutrons 22
v. Electronic configuration 2,8,8,1

d)  Define the following terms:                                                                                                                         [5]
i. Valency
ii. Solute
iii. Cation
iv. Symbol
v. Element

e)  What is the meaning of a balanced chemical equation? Explain in detail.                                          [5]

f)  Give balanced chemical equations for the action of heat on the following:                                        [5]  
i. Red lead
ii. Lead dioxide
iii. Potassium dichromate
iv. Silver oxide
v. Mercuric oxide

g)  A given amount of gas A is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice, the pressure of the gas is 100 cm Hg.                                                                          [5]

i. What is the temperature when the pressure is 10 cm Hg?
ii. What will be the pressure when the chamber is brought 100°C?

h)  State whether the following statements are True or False.                                                                    [5]
i. During an endothermic reaction, heat is liberated.
ii. During a chemical change, a new product is always formed.
iii. 1 atmospheric pressure is equal to 760 mm of Hg.
iv. Sodium nitrate is stable towards heat.
v. Neutralization is a type of double decomposition reaction.

 

                                                                     Section II (40 Marks)
                                                                 Attempt any four questions from this section.
Question 2

a)  How does the Modern atomic theory contradict and correlate with Dalton’s atomic theory?        [5]

b)  Classify the following as homogeneous or heterogeneous and give one example of each:           [5]
i. Solid–Solid
ii. Solid–Liquid
iii. Gas–Gas
iv. Liquid–Liquid
v. Gas–Solid

Question 3

a)  Define the following terms:                                                                                                                         [6]
i. Solution
ii. Crystallisation
iii. Hard water

b)  What are drying agents? Name the drying agents for the following gases:                                         [4]
i. Chlorine
ii. Hydrogen chloride
iii. Ammonia
iv. Sulphur dioxide

Question 4

a)  Give reasons for the following:                                                                                                                    [3]
i. Hydrogen shows dual nature?
ii. Gases diffuse rapidly.
iii. Rivers and lakes not freeze easily?

b)  Name the solvent for the following precipitates:                                                                                    [6]
i. Silver chloride
ii. Lead sulphate
iii. Lead chloride
iv. Copper hydroxide
v. Zinc hydroxide
vi. Silver nitrate

c)  What is latent heat of vaporization?                                                                                                           [1]


Question 5

a)  State which of the following are oxidized or reduced?                                                                          [5]                    i. $\mathrm{S}^{2-} \rightarrow \mathrm{S}$
ii. $\mathrm{Cl}^{-} \rightarrow \mathrm{Cl}$
iii. $\mathrm{Mn}^{5+} \rightarrow \mathrm{Mn}^{7+}$
iv. $\mathrm{Cl}_{2} \rightarrow \mathrm{Cl}^{-}$
$\mathrm{v} \cdot \mathrm{Cr}^{7+} \rightarrow \mathrm{Cr}^{5+}$

b)  Give the assumptions of the kinetic molecular theory.                                                                          [3]

c)  What is a photochemical reaction? Give one example.                                                                          [2]

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