Performing and observing the following
reactions and classifying them into:
A.
Combination reaction
B.
Decomposition reaction
C.
Displacement reaction
D.
Double displacement reaction
(i)
Action of water on quicklime
(ii)
Action of heat on ferrous sulphate crystals
(iii)
Iron nails kept in copper
sulphate solution
(iv)
Reaction between sodium sulphate and barium chloride solutions

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Solution

Dear student,

A) Quick lime is calcium oxide (CaO). When water is added to a small quantity of quick lime in a beaker, it forms a suspension of slaked lime (Ca(OH)₂). The beaker becomes hot as the reaction is exothermic. It is a combination reaction.
$C a O + H_{2} O \to C a (O H)_{2}$

B) Take ferrous sulphate crystals in a dry boiling tube and hold the tube with a tube holder. On heating, the colour of crystals changes from green to white and then brown and a gas with the smell of burning sulphur is evolved. It is a decomposition reaction.
$2 F e S O_{4} . 7 H_{2} O \to_{- 14 H_{2} O}^{∆} 2 F e S O_{4} \overset{∆}{\to} F e_{2} O_{3} + S O_{2} (g) + S O_{3} (g) G r e e n w h i t e b r o w n$

C)Iron being more reactive than copper will displace copper from copper sulphate solution. A brown layer of copper will be deposited on iron nail and blue colour of the solution will fade away. It is a displacement reaction.
$F e + C u S O_{4} \to F e S O_{4} + C u$

D) On mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is formed. It is a double displacement reaction.
$B a C l_{2} + N a_{2} S O_{4} \to B a S O_{4} + 2 N a C l B a r i u m s o d i u m b a r i u m s o d i u m c h l o r i d e s u l p h a t e s u l p h a t e c h l o r i d e$

Regards

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Q. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

Question 10

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)

Question 10

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

(a) (i) only
(b) (ii) only
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(d) (ii) and (iv)

Q. The reaction between iron and copper sulphate solution represents which type of reaction ?
(1) decomposition
(2) combination
(3) single displacement
(4) double decomposition

Q. You are given the following materials:
(i) Iron nails
(ii) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quicklime

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 colour 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.
Write chemical equations for each one of the above reactions.

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