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ICSE Mock Test – 2008
Chemistry, Class – X
Time: 1Hour 30 Minutes
Full Marks – 80

SECTION – A (Attempt all questions)

[A] 1) Choosing only words from the following list write down the appropriate words fill in blanks (1)
to (5) below:                   [5]

Cold water, iron (ii ) sulphate, nitroso- ferrous sulphate, dil.nitric acid, conc.sulphuric acid, Conc.
Hvdrochloric Acid .

To perform brown ring test, take a solution of (i).................……..& add to it freshly prepared saturated
soln.of (ii).................... …... Then add (iii)from the side of the test tube & cool it thoroughly from out side
under (iv) …………………….Keep the test tube standing for a short time. A brown ring of
(v)……………………… found at the junction of two liquids.

2) a) What kinds of particles will be found in a liquid compound which is a non electrolyte? [1]

b)If HX is a weak acid , what particles present in its dil. Soln. Apart from those of water? [1]

c) Cations are formed by ....................... of electrons and anions are formed by ............................... of
electrons. [1]

d) What ions must he present in a soln. Used for electro planting a particular metal [1]

e) Explain , how electrolysis is an example of redox reaction? [1]

[B]1) write the balanced equations for the following: [5]

    i)        Potassium hydrogen carbonate and dil. Sulphuric acid.
    ii)       Copper oxide and dil. Hydrochloric acid.
    iii)      Manganese di oxide and conc. Hydrochloric acid.
    iv)       Sulphur and conc. nitric acid.
    v)        Sodium nitrate and conc. Sulphuric acid.

2] Name the following coloured compounds/element represented by A,B,C,D &E from the list: [5]

Manganese di-oxide, Carbon, Nitrogen di-oxide, Red lead and Sulphur monochloride

a) A red liquid A formed when yellow non metal reacts with chlorine

b) A black substance B behaving both as oxidizing agent and catalyst.

c) A black deposits C when chlorine reacts with turpentine.

d)A red mixed oxide D which oxidize conc. HCL to CL2 .

e) A coloured gas E obtained from two colour less gases.
[C] 1 ) State what you see when          [5]

a) A price Of moist blue litmus paper is placed in a jar of chlorine.

b) A piece of red paper is placed ill in a jar of ammonia.

c) A burning magnesium ribbon is plunged in a jar containing carbon di-oxide.

d) Sodium is placed in water.

e) Nitric oxide reacts with oxygen.

2] give the formula of:                        [5]

a) bauxite
b) cryolite
c) haematite
d) zinc blende

[D] X} state one reason why                    [4]

1] tap water is not used to prepare a solution of silver nitrate.

2] sulpher di-oxide is called an hydride of sulphurous acid.

3] zinc is used to prevent rusting of iron.

4] the bleaching by chlorine is an oxidizing property.

Y} define the following. Electrolysis, Acid salt, Double salt.      [6]

SECTION – B (Answer any four questions)

[E] 1) For each substance listed below, explain its significance in the extraction of aluminium   [4]

i) Cryolite
ii)Sodium hydroxide
iii)Calcium fluoride
iv)powdered coke

2)a) What is an alloy?             [4]

  b) An alloy has some property which makes it useful. What is that Special property of

  1) Magnalium
  2) Brass
  3) Stainless Steel

3) How can ammonia be separated from unreacted nitrogen and hydrogen? [2]
[F]1) For what purpose are the following chemical used:      [4]
            Mustard gas, Ethylene glycol, Di-ethyl ether, Ethylene oxide.

2) Empirical formula of a compound is C2H4O and its V.D is 44.find out the molecular formula of the
compound.       [2]

3) A greenish gas A is dissolved in water to form a soln. Containing two acids B and C. After allowing this
soln. To stand in bright sunlight, only the acid remained, and a colourless gas D was seen to bubble from
soln, Write down the names for A.B,C and D . [4]

[G] 1)define :   functional group, homologous series.       [4]

2) write the equation for the following laboratory preparation:   [6]

i) ethane from sodium propionate
ii) ethane from calcium carbide
iii) ethane from iodoethane
iv) methanol from iodomethane.

[H]1) define: Ionization potential energy, Electro negativity      [4]

2) Answer the following:        [6]

a) Write the formula of sulphate of the element with atomic no. 13
b) What type of bonding will be present in the oxide of the element with atomic no 1.
c) Name the element which has highest ionization potential.
d) What is the electronic configuration of the element in the third period which gains 1 electron to change
into an anion.
e) How many electrons are present in the valiancy shell of the element with atomic no.18
f) Name the element which shows catenation property.

[I]1) If a crop of wheat remove 20 kgs of nitrogen per hectare of soil, what mass in kgs of the calcium
nitrate would be required to replace the nitrogen in a 10 hectare field? [N=14,O=16,Ca=40]          [3]

2) Find the relative molecular mass of a gas, 0.546gm of which occupies 360 ml at 87 C and 380mm Hg
pressure.1 litter of hydrogen at s.t.p weighs 0.09gm.                  [3]

3) state the laws:         Avogadro's                       [4]

[J] 1 ) What is alone pair of electrons? Draw an c electron dot diagram of a hydronium ion and label the
lone pair of electrons.                   [4]

2) Covalent compounds are usually liquid or gases. Explain                  [2]

3) Explain how electrolysis is an example redox reaction.                          [2]

4) What are the general formula of alkyne.         [2]

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