1.
A
non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
2.
A
solution of potassium chloride when
mixed with silver
nitrate solution, an insoluble white
substance is formed. Write the chemical
reaction involved and also
mention the type of the chemical reaction ?
3.
A
substance X, which is an oxide of a metal
is used intensively in the cement industry. This element is present in bones also.
On treatment with water
it forms a solution which turns
red litmus blue. Identify X and also write
the chemical reactions involved.
4.
What is Plaster
of Paris ? How it is obtained from Gypsum. Write
chemical reaction. Give its one
use.
5.
A
metal A, which is used
in thermite process, when heated with
oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with
HCl and NaOH.
6.
Why
do we store silver chloride in dark coloured bottles ?
7.
A
magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light.
(a)
Write the chemical
formulae of X
(b)
Write a balanced chemical equation, when X is dissolved in water.
8.
Salt
A commonly used in bakery products on heating gets converted into
another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed
through lime water, turns it milky. Identify A,B and C.
Write balanced chemical equations
for each step.
9.
Fill
in the missing data in the following
table
10.
(i) Given below are the steps for extraction of
copper from its ore. Write the
reaction involved.
(a)
Roasting
of copper (1) sulphide
(b)
Reduction
of copper (1) oxide with copper (1) sulphide.
(c)
Electrolytic
refining
(ii)
Draw a neat and
well labelled diagram for
electrolytic refining of copper
OR
(a)
Explain the formation of Magnesium Chloride by the
transfer of electrons.
(b)
Explain three
properties of ionic compounds.
