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ICSE-X-Chemistry

Previous Year Paper year:2016

with Solutions - page 2

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  • #1-c [5]
    Write balanced chemical equations for each of the following :
  • #1-c-i
    Action of warm water on AIN.
    Ans : $$\ce{AlN(s) + 3H2O(l) -> Al(OH)3(aq) + NH3(g)}$$
  • #1-c-ii
    Action of hot and concentrated Nitric acid on copper.
    Ans : $$\ce{Cu(s) + 4HNO3(aq) -> Cu(NO3)2(aq) + 2NO2(g) +H2O(l)}$$
  • #1-c-iii
    Action of Hydrochloric acid on sodium bicarbonate.
    Ans : $$\ce{NaHCO3(s) + HCl(l) -> NaCl(aq) + H2O(l) + CO2(g)}$$
  • #1-c-iv
    Action of dilute Sulphuric acid on Sodium Sulphite.
    Ans : $$\ce{Na2SO3(s) + H2SO4(l) -> Na2SO4(aq) + H2O(l) + SO2(g)}$$
  • #1-c-v
    Preparation of ethanol from Ethyl Chloride.
    Ans : $$\ce{CH3CH2Cl + KOH(aq) -> CH3CH2OH + KCl(aq)}$$
  • #1-d [5]
    State your observations when :
  • #1-d-i
    Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture
    is heated.
    Ans : When dil. HCl is added to lead nitrate solution and heated, it forms a
    white precipitate of lead chloride.
    $$\ce{Pb(NO3)2 + 2HCl -> PbCl2 + 2HNO3}$$
  • #1-d-ii
    Barium chloride solution is mixed with Sodium Sulphate Solution.
    Ans : A white precipitate of barium sulphate forms when barium chloride is
    mixed with sodium sulphate.
    $$\ce{BaCl2(aq) + Na2SO4(s) -> 2NaCl(aq) + BaSO4(s)}$$
  • #1-d-iii
    Concentrated Sulphuric acid is added to Sugar Crystals.
    Ans : When sugar reacts with conc. ``\ce{H2SO4}``, it gives a black spongy mass of
    carbon which is called sugar charcoal.
    $$\ce{C12H22O11(s) ->[conc. H2SO4] 12 C(s) + 11H2O}$$
  • #1-d-iv
    Dilute Hydrochloric acid is added to Copper carbonate.
    Ans : When dilute hydrochloric acid is added to copper carbonate, it
    decomposes to give copper chloride.
    $$\ce{CuCO3 + 2HCl -> CuCl2 + H2O + CO2 (^) }$$
  • #1-d-v
    Dilute Hydrochloric acid is added to Sodium thiosulphate.
    Ans : Dil. HCl reacts with thiosulphates to produce sulphur dioxide and
    yellow sulphur is precipitated.
    $$\ce{Na2S2O3 + 2HCl -> 2NaCl + H2O + SO2 + S (v)}$$
  • #1-e [5]
    Identify the term / substance in each of the following :
  • #1-e-i
    The tendency of an atom to attract electrons to itself when combined in a
    compound.
    Ans : The tendency of an atom to attract electrons to itself when combined
    in a compound: Electronegativity
  • #1-e-ii
    The method used to separate ore from gangue by preferential wetting.
    Ans : The method used to separate ore from gangue by preferential wetting:
    Froth flotation process
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