Subject

Chemistry

Class

ICSE Class 10

Pre Boards

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Sample Papers

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ICSE Class 10 Chemistry Solved Question Paper 2007

Long Answer Type

31.
The following is an extract from metals in the services of man alexander and street/pelican 1976:

Alumina (aluminium oxide) has a very high melting point of over 2000⁰C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance.

(I) Which solution is used to react with bauxite as a first step in obtaining a pure aluminium oxide?

(II) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.

(III) Name the element which serves both as the anode and the cathode in the extraction of aluminium

(IV) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis

(V) Give the equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.

i) Sodium hydroxide solution

ii) 2Al(OH)₃+heat ---> Al₂O₃ +3H₂O

iii) Carbon serves both as the anode and the cathode in the extraction of aluminium.

iv) Al³⁺ +3e^------> Al

v) Al----> Al³⁺ +3e^-

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32.

Q2 (a) some properties of sulphuric acid are listed below. Choose the property A,B, C and D which is responsible for the reaction (i) to (v) some properties may be repeated:

A) Acid

B) Dehydrating agent

C) Non-volatile acid

D) Oxidizing agent

(i) C₁₂H₂₂O₁₁ +2H₂SO₄ ---> 12C +11H₂O +nH₂SO₄

(ii) S+2H₂SO₄ ----> 3SO₂ +2H₂O

(iii) NaCl +H₂SO₄ ---> NaHSO₄ +HCl.

(iv) CuO +H₂SO₄ ---> CuSO₄ +H₂O

(v) Na₂CO₃ +H₂SO₄ ----> Na₂SO₄ +H₂O +CO₂

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33.

Give the IUPAC names of the following compounds numbered (i) to (v). The IUPAC names of the compounds on the left are to guide you into giving the correct IUPAC names of the compounds on the right.

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34.

Copy and complete the following table which relates to three homologous series of hydrocarbon:

General Formula	C_nH_2n	C_nH_2n-2	C_nH_2n+2
IUPAC name of the homologous series
Characteristic bond tyres
IUPAC name of first member of the series
Types of reaction with chlorine