Previous Year Paper year:2019 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2019

with Solutions - page 5

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#2-c-ii
The ion of which element will migrate towards the cathode during electrolysis?
Ans : A [Positive ions migrate towards cathode, hence A will form A+ and migrate towards cathode]

#2-c-iii
Which non-metallic element has the valency of 2?
Ans : E

#2-c-iv
Which is an inert gas?
Ans : F

#3

#3-a
Name the particles present in:

#3-a-i
Strong electrolyte
Ans : Only ions

#3-a-ii
Non-electrolyte
Ans : molecules

#3-a-iii
Weak electrolyte
Ans : Ions as well as molecules

#3-b
Distinguish between the following pairs of compounds using the reagent given in the bracket.
[3]

#3-b-i
Manganese dioxide and copper (II) oxide, (using concentrated HCl)

Ans :

#3-b-ii
Ferrous sulphate solution-and ferric sulphate solution, (using sodium hydroxide solution)

Ans :

#3-b-iii
Dilute hydrochloric acid and dilute sulphuric acid, (using lead nitrate solution)

Ans :

#3-c
Choose the method of preparation of the following salts, from the methods given in the list:
[4]

[List: A. Neutralization

B. Precipitation

C. Direct combination

D. Substitution]

#3-c-i
Lead chloride
Ans : Lead chloride → Precipitation(B)

#3-c-ii
Iron (II) sulphate
Ans : Iron (II) sulphate → Substitution (D)