1.
What
chemical process is used
for obtaining a metal from its oxide
?
2.
Complete and Balance
the reaction
Fe2O3
+ Al →
3.
What
do you see when
penta-hydrated copper sulphate
crystals are heated.
Give reaction too.
4.
(a)
Fe + CuSO4 → FeSO4 + Cu
(b) Cu + FeSO4 →
CuSO4 + Fe
Which of the above
two reactions will take place
and why ?
5.
Why is sodium kept immersed in kerosene oil ?
6.
Name
two salts that
are used in black
and white photography.
Give reactions when they
are exposed to light.
7.
You have
been provided with three
test tubes. One of
them contains distilled water and the other
two contain an acidic solution and
a basic solution respectively. If
you are given only red
litmus paper, how will you
identify the contents of each test tube
?
8.
(a)
What do you see when a magnesium
ribbon is burnt ? Is magnesium oxidized
or reduced in this reaction.
(b) Define
corrosion.
9.
(a)
All ores are minerals but all
minerals are not ores. Justify the
statement.
(b) What
is Galvanisation ?
(c) Give composition of brass and
bronze
(d) Explain
roasting with help of a reaction.
(e) What
do you mean by amalgam ?
OR
With reference to electrorefining of impure
copper, answer the following :
(a) Draw
a neat and labelled diagram requised for the purpose of
electrorefining.
(b) What
is electrolyte used ?
(c) Name
the cathode and anode used ?
(d) What
happens at cathode and Anode ?
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