ICSE CHEMISTRY CLASS 10 PRACTICE PAPER-8

ICSE CHEMISTRY CLASS 10 PRACTICE PAPER-8

PERIODIC TABLE, CHEMICAL BONDING, HCl, AMMONIA, ORGANIC CHEMISTRY and ELECTRYSIS

Section I (40 Marks)

Answer all the questions

Question 1

a) Choose the correct answers from the list of words given below                                           5M

(Electropositivity, Carboxylic acid, lone pair, Electronegativity, Chemical bonds, decarboxylation)

i)        An Organic compound containing “ - COOH” GROUP.

ii)      The tendency to attract electrons to itself.

iii)    The electron pair which is present in the valence shell and does not participate in covalent bonding.

iv)    The tendency to lose electrons.

v)      Elimination of Carbon dioxide from Carboxylic acid group.

b) Select the correct answers from the words given below:                                                       5M

i)           An element ‘X’belongs to Group 2 of period 3. Then ‘X’ has

A) 3 valence electrons and 2 shells

B) 2 valence electrons and 3 shells

C) 2 valence electrons and 2 shells

D) 1 valence electron and 2 shells

ii)         Ammonium chloride consists of

A)    Covalent and ionic bonds

B)    Ionic bonds only

C)    Covalent , ionic and coordinate covalent bonds

D)    Covalent and coordinate covalent bonds

iii)       Which of the following compound is not suitable for the preparation Ammonia by heating with an alkali?

A)    Ammonium sulphate

B)    Ammonium chloride

C)    Ammonium nitrate

D)    Ammonium sulphate and Ammonium chloride

iv)       Which of the following statement is not correct regarding electrolysis process:

A)    Cations get discharged at cathode

B)    Anions get oxidized at anode

C)    Metal deposits at anode

D)    Inert electrodes do not participate in electrolytic reaction.

v)         Aqua regia is a mixture of

A)    1 volume of Conc. HCl and 3 volumes of Conc. HNO₃

B)    3 volume of Conc. HCl and 1 volumes of Conc. HNO₃

C)    1 volume of Conc. HCl and 1 volumes of Conc. HNO₃

D)    1 volume of Conc. HCl and 3 volumes of Conc. H₂SO₄

c) Name the following.                                                                                                               5M

i)        The gas which gives white dense fumes with Ammonia gas.

ii)      The element with highest electronegativity.

iii)    The electrolyte used in the electroplating with Silver metal.

iv)    The bond formed by sharing of electrons.

v)      The common name for the Hydrocarbons with general formula C_nH_2n.

d) i) 40 lit. of Hydrogen is burnt in presence of 25 lit. of Chlorine gas.                                    2M

                  H₂  + Cl₂  à  2HCl

         Find     A) The volume of Hydrogen gas unused.

                     B) The volume of HCl produced.

ii) CaCO₃  à CaO + CO₂

Given equation shows the thermal decomposition of Calcium carbonate.

A)    Calculate the mass of CaO and CO₂ released when 10g of CaCO₃ is heated.

B)    How much CaCO₃ is required to produce 2.8g of Calcium oxide.

(At. Wt. Ca-40, C-12, O-16)

e) Distinguish the following pairs of compounds using the reagent given in the brackets.      5M

i) ZnSO₄ and PbSO₄                            (NH₄OH)

ii) Dilute. HCl and dil.H₂SO₄       (AgNO₃ solution)

iii) FeCl₃ and CuSO₄                           (NaOH solution)

iv) Na₂CO₃ and Na₂SO₃               (dil. HCl and acidified KMnO₄)

v) Ethylene and Ethane                (Bromine solution)

f) Correct and rewrite the following statements.                                                                      5M

i)        Metallic character decreases with the tendency to lose electrons.

ii)      Ammonia gas is released when metal nitrides are treated with water.

iii)    Hydrochloric acid is prepared in the laboratory by passing Hydrogen chloride directly through water.

iv)    An ionic compound contains ions and molecules.

v)      Alkanes are highly reactive than Alkenes.

g) Give reason why:

i) Ionisation potential decreases down a group.

ii) Ionic compounds have high boiling point and melting point.

iii) Dilute H₂SO₄ is preferred dil. HNO₃ to dilute water before its electrolysis.

iv) Alkanes do not undergo addition reactions.

v) In the catalytic oxidation of Ammonia gas, Platinum metal continues to glow even after

     heating is discontinued.

h) State your observations when:

i) Dry Ammonia gas is burnt in the atmosphere of Oxygen.

ii)  Conc. HCl is heated with MnO_2­.

iii) During the electrolysis of Copper sulphate solution using inert electrodes.

iv) Acetylene is treated with Ammoniacal Cupric chloride solution.

v) Ammonia gas is mixed with excess Chlorine gas.

Section II (40 Marks)

Answer any four of the following questions

Question 2                                                                                                                      (3+3+2+2)

a)      M is an active metal. Its oxide has the formula M₂O.

i)     What would be the valency of that metal?

ii)   Write the formula of its hydroxide.

iii)    State the group number it belongs to.

b)      X, Y and Z are the elements with the atomic numbers 8,9 and 10 respectively. Then

i)        Write the electronic configuration of the element Y.

ii)      Identify the halogen among them.

iii)    Which of them has the highest ionization potential value?

c)      i) Atomic radius ___________decreases/ increases across a period.

ii) An element has atomic number 5. Then it is a __________ metal/nonmetal/metalloid.

d)     Arrange the following elements according to the description given in brackets:

i)        Na, Li, K, Cs (decreasing order of atomic radius)

ii)      O,C, B, F (increasing order of Electronegativity)

Question 3                                                                                                                      (3+3+2+2)

a)      i) Electrovalent compounds are in ____________ (polar/non polar) solvents.

ii) A molecule of __________ (Ammonia/Nitrogen) contains a triple bond.

iii) Lower I.P values of metallic atoms favours the formation of _________ (anion/cation).

b)      State the nature of the following compounds in terms of electrovalent/ covalent.

i) HCl              ii) NaCl                       iii) CaO

c)      Draw electron dot structure of :

i) Hydronium ion                    ii) Ammonia molecule

d)     i) Give reason why HCl dissolves in water but does not in CCl₄.

ii) State the covalency of Carbon.

Question 4                                                                                                                      (3+2+2+3)

a)      i) Which property of HCl gas is proven using fountain experiment?

ii) Conc. HCl is oxidized to liberate ________ (Chlorine/Hydrogen) gas by an oxidizing agent.

iii) Write balanced equation for the preparation of HCl gas in the laboratory method, with conditions required.

b)      Name the gases released when dil. HCl is treated with :

i) Na₂CO₃                          ii) FeS

c)      State your observations seen when dil. HCl is added to:

i) CuS              ii) Lead nitrate

d)   i) Write balanced equation for the reaction between dil.HCl and Na₂S₂O₃.

ii) What is the significance of Aqua regia?

iii) State the importance of special funnel arrangement in the preparation of Hydrochloric acid.

Question 5                                                                                                                      (2+2+2+4)

a)      i)Write the balanced equation for the preparation of Ammonia in laboratory method.

ii) Name the catalyst used in Haber’s process.

b)      State the observations seen when:

i) Ammonia gas is passed over heated Copper oxide.

ii) Red litmus solution enters the round bottom flask filled with Ammonia gas in fountain experiment.

c)      i) Name the acidic gas that reacts with excess Ammonia gas to produce Ammonium chloride and Nitrogen gas.

ii) Mention any one chemical test of Ammonia gas.

d)    

i)        Name the catalyst ‘X’.

ii)      State the observation seen the round bottom flask.

iii)    Identify the gas formed in the round bottom flask.

iv)    What is the required temperature for this reaction to take place?

Question 6                                                                                                                        (4+4+2)

a)      i) Oxidation takes place at ___________ (anode/cathode) during an electrolysis process.

ii) Name the electrolyte and the anode used during the electroplating of an article with Nickel.

iii) Differentiate between anode and cathode.

b)      Answer the following questions pertaining to the electrolysis of fused Lead bromide.

i)        Name the gas released at anode.

ii)      State one appropriate observation during the process.

iii)    Graphite is preferred as anode in this process.

iv)    Write balanced equation for the reaction at cathode.

c)      i) Give reason why direct current should be passed through the electrolyte during electrolysis.

ii) Name the anode taken in the electro-refining of Copper metal.

Question 7                                                                                                                  (2+2+2+2+2)

a)      Name the following organic compounds.

i)                                                                                                                    ii)

b)      i) Draw the branched structures of:

i) Propanoic acid                                 ii) 2-Butanol

c)      Write balance equations for the preparation of:

i)     Ethene by dehydration of Ethyl bromide

ii)   Ethyl ethanoate by Esterification.

d)     i) Name the gas released when Calcium carbide is treated with cold water.

ii) Which type of isomerism is shown by 1-Butene and 2-Butene.

e)      i) Name the product formed in the third step of substitution reaction of Methane with Chlorine.

ii) Mention one any one use of Ethylene.