ICSE CLASS 9 CHEMISTRY SAMPLE PAPER – 2

ICSE Board

Class IX Chemistry

Time: 2 hrs.                                                  Sample Paper 2                                      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

1. Define the following terms:                                                                                                               [5]

         i. Valence electron

         ii. Solvent

         iii. Anion

         iv. Shell

2. Deduce the molecular formula of the following:                                                                         [5]

1. Mercury (II) nitrate/mercuric nitrate

2. Sodium chlorate

3. Calcium oxalate

4. Sodium acetate v. Cupric hydroxide

3. State the type of reaction
   [5]

1. $mathrm{NaOH}+mathrm{HCl} rightarrow mathrm{NaCl}+mathrm{H}_{2} mathrm{O}$

2. $mathrm{BaCl}_{2}+mathrm{H}_{2} mathrm{SO}_{4} rightarrow mathrm{BaSO}_{4}+2 mathrm{HCl}$

3. $2 mathrm{Fe}+3 mathrm{Cl}_{2} rightarrow 2 mathrm{FeCl}_{3}$

4. $2 mathrm{PbO}_{2} stackrel{Delta}{rightarrow} 2 mathrm{~Pb} 0+mathrm{O}_{2}$

5. $mathrm{PbCl}_{5} stackrel{text { heat thencool }}{longrightarrow} mathrm{PCl}_{3}+mathrm{Cl}_{2}$

d)  Fill in the blanks:                                                                                                                                   [5]

1. Dalton used symbol _____ for oxygen and symbol _____ for hydrogen.

2. Symbol represents _____ atom(s) of an element.

3. Symbolic expression for a molecule is called _____.

4. Sodium chloride has two radicals. Sodium is a _____ radical, while chloride is _____ radical.

5. Valency of carbon in

$mathrm{CH}_{4} text { is } quad text { in } mathrm{C}_{2} mathrm{H}_{6} text { is } quad text { in } mathrm{C}_{2} mathrm{H}_{4} text { is }-text { and in } mathrm{C}_{2} mathrm{H}_{2} text { is }$

5. Write the formula and balance the following chemical equations:                                       [5]

1. Manganese (IV) oxide + Concentrated hydrochloric acid → Manganese (II) chloride +Water + Chlorine

2.  Potassium dichromate + Concentrated hydrochloric acid → Potassium chloride +Chromium chloride + Water + Chlorine

3. Sulphur dioxide + Oxygen → Sulphur trioxide

4.  Zinc + Water → Zinc oxide + Hydrogen

5.  Aluminium + Dilute hydrochloric acid → Aluminium chloride + Hydrogen

6. Compare:                                                                                                                                                 [5]

1. Sodium atom and sodium ion

2. Chlorine atom and chloride ion, with respect to

a) Atomic structure

b) Electrical state

c) Chemical action

d) Toxicity

7. Each question has four options out of which only one option is correct. Write the correct option.

                                                                                                                                                       [5]

     i. Choose the air pollutant which is non-acidic.

             (a) $mathrm{NO}_{2}$

       (b) $mathrm{SO}_{2}$

       (c) $mathrm{SO}_{3}$

(d) Ozone

   ii. Choose the odd one.

      (a) HCl

(b) $mathrm{H}_{2} mathrm{CO}_{3}$

(c) $mathrm{HNO}_{3}$

(d) $mathrm{H}_{2} mathrm{SO}_{4}$

iii. On adding water to sodium, the solution formed is

(a) Neutral

(b) Alkaline

(c) Acidic

(d) Amphoteric

iv. According to Boyle’s law, as the pressure increases, the volume

(a) Increases

(b) Decreases

(c) Remains the same

(d) First increases and then decreases

v. $text { In the element } mathrm{Na}_{11}^{23}, 11 text { represents }$

(a) Mass number

(b) Atomic number

(c) Number of neutrons

(d) None of the above

h) State the valency and formula of the following ions:
[5]

     i. Ammonium ion

     ii. Cupric ion

     iii. Ferric ion

     iv. Plumbous ion

     v. Nitrate ion

Section II (40 Marks)

                                       Attempt any four questions from this section

Question 2

1. Correct the following statements:

1. Hydrogen is used as a fuel for rocket propulsion.

2. All metals react with acids to give hydrogen.

3. Metals adsorb hydrogen.

4. The reaction between hydrogen and oxygen is exothermic.

5.  Conc. H2SO4 reacts with zinc to liberate hydrogen.                                                          [2]

(b) How will you incorporate the following information into an equation?

1. Presence of catalyst

2. Temperature and pressure conditions

3. Evolution of a gas

4.  Formation of precipitate

5.  Evolution of heat

6. Physical state of the reactants and products                                                                       [3]

(c) Give reason.

1. An atom is electrically neutral.

2. The mass of an atom is concentrated in the nucleus of an atom.

3. The Rutherford model of an atom could not provide stability to the nucleus.          [5]

Question 3

(a) How do fish and aquatic animals survive when a pond is covered with thick ice?         [2]

(b) Classify solutions on the basis of solubility.                                                                                [3]

(c) Name two elements whose properties were correctly predicted by Mendeleev. Mention their present-day name.                                                                                                                           [2]

(d) Explain endothermic and exothermic reactions with the help of an example.                 [3]

Question 4

(a) Choose the odd one out from the following:                                                                                [3]

1. He, Ne, H, Kr

2. Na, Rb, Fr, Ca

3. F, At, Cl, Si

4. Si, C, Al, Ge

5.  K, Zr, Hf, Ti

6.  Fe, Cu, Ge, Zn

(b) Identify the element present in the following groups and periods:                                      [3]

1. Group 1, Period 5

2. Group11, Period 4

3.  Group16, Period 2

4. Group 17, Period 3

5. Group 18, Period 4

6. Group 2, Period 3

(c)

1. Density of water varies with temperature. What are its consequences?

2. A solid is crystalline, has a high melting point and is water soluble. Describe the

nature of the solid.                                                                                                                                       [4]

Question 5

(a)

1. Define group and period.

2. How many elements are present in the first, second and third periods?

3. Name all the elements present in Groups 1 and 17.                                                           [5]

(b) What is the significance of the word ‘latent’ in latent heat? Define the two types of

latent heat.                                                                                                                                                     [5]