Previous Year Paper year:2018 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2018

with Solutions - page 2

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#1-c [5]
Write a balanced chemical equation for each of the following:

#1-c-i
Action of concentrated sulphuric acid on carbon.
Ans : Action of concentrated sulphuric acid on carbon.
$$\ce{C + H2SO4 -> CO2 (^) + 2SO2(^) + 2H2O }$$

#1-c-ii
Reaction of sodium hydroxide solution with iron (III) chloride solution.
Ans : Reaction of sodium hydroxide solution with iron (III) chloride solution.
$$\ce{FeCl3 +3NaOH -> Fe(OH3) (v) + 3NaCl }$$

#1-c-iii
Action of heat on aluminium hydroxide.
Ans : Action of heat on aluminium hydroxide.
$$ \ce{ 2Al (OH)3 -> Al2O3 + 3H2O }$$

#1-c-iv
Reaction of zinc with potassium hydroxide solution.
Ans : Reaction of zinc with potassium hydroxide solution.
$$\ce{Zn + 2KOH -> K2ZnO2 + H2 (^)}$$

#1-c-v
Action of dilute hydrochloric acid on magnesium sulphite.
Ans : Action of dilute hydrochloric acid on magnesium sulphite.
$$\ce{MgSO3 + 2 (dil.) HCl -> MgCl2 + H2O + SO2 }$$

#1-d [5]

#1-d-i
Give the IUPAC name for each of the following:

Ans :
1. Methanal
2. Propan-1-al
3. But-2-ene

#1-d-ii
Write the structural formula of the isomers butane.
Ans : Structural formulae of the isomers of butane:
;

#1-e [5]
State one relevant observation for each of the following:

#1-e-i
Lead nitrate solution is treated with sodium hydroxide solution drop wise
till it is in excess.
Ans : Lead nitrate solution is treated with sodium hydroxide solution drop-wise
till it is in excess and then a white precipitate of lead hydroxide is
formed.
$$\ce{Pb(OH)2 + \underset{ \text{(excessive)}}{2NaOH } -> \underset{ \text{(sodium plumbite)}}{Na2PbO2} + 2H2O}$$

#1-e-ii
At the anode, when molten lead bromide is electrolyzed using graphite
electrodes.
Ans : At the anode, when molten lead bromide is electrolysed using graphite
electrodes, dark reddish brown fumes of bromine are evolved.
$$\ce{PbBr2(l) -> Pb (s) + \underset{\text{Reddish Brown gas}}{2Br (g)} }$$

#1-e-iii
Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
Ans : Lead nitrate solution is mixed with dilute hydrochloric acid and heated to
give a white precipitate of lead (I) chloride.
$$\ce{PbBr2(l) -> Pb (s) + \underset{\text{Reddish Brown gas}}{2Br (g)} }$$

$$\ce{ 2 2Pb(NO3)2 + 2 HCl -> PbCl2 (v) + 2 HNO3}$$

#1-e-iv
Anhydrous calcium chloride is exposed to air for some time.
Ans : Anhydrous calcium chloride is exposed to air for some time, and then it
will absorb moisture as it is a deliquescent substance and dissolves in it.

#1-e-v
Barium chloride solution is slowly added to sodium sulphate solution.

Ans : Barium chloride solution is slowly added to sodium sulphate solution, and
it gives a white-coloured precipitate of barium sulphate.
$$\ce{BaCl2 + Na2SO4 -> BaSO4 (v) + 2 NaCl}$$