1.
Name one metal
which react with
very dilute HNO3 to evolve
Hydrogen gas.
2.
What is the brown coloured gas evolved when lead
nitrate crystals are heated in a dry test tube ?
3.
Name the acid present in
(1)
ant sting (2)
tamarind.
4.
Write balanced equations for the reaction of :
(a)
Iron with steam
(b)
Calcium with water.
5.
On
mixing solutions of lead nitrate and potassium iodide in a test tube.
(a)
Write the chemical equation involved in the balanced form.
(b)
What is the colour of the precipitate ? Name
the precipitate.
6.
How pure copper is obtained from impure copper by electrolytic refining ?
7.
Write the
balanced equation involved, when
(a)
Chlorine is passed over dry
slaked lime.
(b) Sodium bicarbonate reacts with
dilute hydrochloric acid
(c) Sodium bicarbonate is heated.
8.
(a)
What is universal indicator?
(b) Write the
chemical equation involved in
the preparation of sodium hydroxide. Name the process.
9.
(a) Write
one equation each for
decomposition reaction when energy is supplied in the form of :
(i) heat (ii) light
(b)
Account for the following.
(i)
Paint is applied on iron articles.
(ii)
Oil and fat containing food items
are flushed with nitrogen.
(iii)
When an iron
nail kept in
copper sulphate solution, blue
colour of the solution fades and
iron nail becomes brownish.
OR
(a)
What do you mean
by
(i)
precipitation reaction (ii)
exothermic reaction (iii)
oxidation reaction
Write
balanced chemical equation.
(b)
When a water insoluble substance
‘X’ is added to dilute hydrochloric
acid a colourless, odourless gas is
evolved. When the gas passed through lime water, it turns milky. Write the chemical formula of X and the
chemical equations involved.
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