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ICSE Class 10 Chemistry Solved Question Paper 2006

Short Answer Type

31.
Calculate the percentage of sodium in sodium aluminium fluoride (Na₃AlF₆) correct to the nearest whole number. (F=19;Na=23; Al=27).

Molecular weight of Na₂AlF₆ = 3 x 23 +27+19 x 6
= 69+27+114
= 210

Weight of sodium = 3 x 23 =69
% of sodium = $69 over 210 x space 100 space equals 32.8 space$

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32.

560mkl of carbon monoxide is mixed with 500ml of oxygen and ignited. The chemical equation for the reaction is as follows:

2CO₂ +O₂ ---> 2CO₂

Calculate the volume of oxygen used and carbon dioxide formed in the above reaction.

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33.

Select from the list given below (A to F), the one substance in each case which matches the descriptions given in parts (ii) &(iii). Copy and complete the given grid with your answer as shown for part(i)

(i)	(ii)	(iii)
A

(A) Ammonia

(B) Copper oxide

(D) Hydrogen chloride

(E) Hydrogen sulphide

(F) Lead bromide

(i) Although this compound is not a metal hydroxide. Its aqueous solution is alkaline in nature.

(ii) A solution of this compound is used as the electrolyte when copper is purified

(iii) When this compound is electrolysed in the molten state, lead is obtained at the cathode.

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34.

State what is observed when:

Copper sulphate solution is electrolyzed using a platinum anode.

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35.

study the diagram given below and answer the questions that follows:

i)

(1) Give the name of the electrode A and B.

(2) Which electrode is the oxidising electrode?

iii) write the equation of the reactions which take place at the cathode and anode when acidified water is electrolyzed.

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36.

Give reason for the following:

A solution of silver nitrate is a good electrolyte but it is not used for electroplating an article with silver

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37.

Q1. (a) select from the list given below (A toF) the one substance in each case which matches the descriptions given in part (vi). Copy and complete the given grid with your answers as shown for part (i).

(i)	(vi)
A

A. Ammonia
B. Copper oxide
C. Copper sulphate
D. hydrogen Chloride
E. Hydrogen sulphide'
F. Lead bromide'

i) although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature.

iv) This compound can be reduced to copper when heated with coke.

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