Example 7. You are given the following materials:
(i) Iron nails
(it) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quick lime
Identify the type of chemical reaction taking place
when :
(a) Barium chloride solution is mixed with copper
sulphate solution and a white precipitate is
observed.
(b) On heating copper powder in air in a china
dish, the surface of copper powder turns black.
(c) On heating green coloured ferrous sulphate
crystals, reddish brown solid is left and smell
of a gas having odour of burning sulphur is
experienced.
(d) Iron nails when left dipped in blue copper
sulphate solution become brownish in colour
and the blue colour of copper sulphate fades
away.
(e) Quick lime reacts vigorously with water
releasing a large amount of heat.
Answers
Answer:
1. Nail are most commonly used to fasten pecies of wood together, but they are also used with plastic, drywall, masonry and concrete. Nails are usually made by steel but can also be made of Stainless Steel, iron, copper, aluminum and bronze.
Answer:
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Class 10
CHEMISTRY
CHEMICAL REACTIONS AND EQUATIONS
You are given the following materials : <br> {:((i), "Iron nails",, (ii), "Copper sulphate solution"),((iii), "Barium chloride solution",, (iv), "Copper powder"),((v), "Ferrous sulphate crystals",, (vi), "Quick lime"):} <br> Identify the type of chemical reaction taking place when : <br> (a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed. <br> (b) On heating, copper powder in air in a china dish, the surface of copper powder becomes black. <br> (c) On heating green ferrous sulphate crystals, reddish brown solid is left and a gas having smell of burning sulphur is noticed. <br> (d) Iron nails when left dipped in blue copper sulphate solution becomes brownish in colour and blue colour of copper sulphate solution fades away.
Updated On: 15-7-2021
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Solution
(a) The reaction is double displacement in nature. <br>
<br> (b) It is an example of combination reaction. <br>
<br> (c) The green crystals of ferrous sulphate have the chemical formula
Upon heating, they lose molecules of water of crystallisation and it is an example of dehydration reaction. <br>
<br> Upon further heating, ferrous sulphate undergoes decomposition reaction as follows : <br>
<br> Both the gases evolved have the small of burning sulphur. <br> (d) This happens because of displacement reaction. Iron displaces copper from copper sulphate solution. Brownish coating of copper gets deposited on the iron nails. As the concentration of coppe sulphate in the solution decreases, the blue colour of the solution slowly fades. <br>