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CBSE Class 10 Answered

Write the chemical equation of the reaction in which the following changes have taken place with an example of each: (i) Change in colour (ii) Change in temperature (iii) Formation of precipitate
Asked by pachchigarkeyur | 08 Mar, 2022, 12:05: PM
Expert Answer

(i)Change of colour 
 
Example:
 
When few pices of Fe are added to the blue copper sulphate solution, the colour of the solution fades
and turns into light green due to the formation of ferrous sulphate.
 Fe subscript open parentheses straight s close parentheses end subscript space space plus space CuSO subscript 4 subscript open parentheses aq close parentheses end subscript end subscript space rightwards arrow with space space space on top space space FeSO subscript 4 subscript open parentheses aq close parentheses end subscript end subscript space space space plus space space Cu subscript open parentheses straight s close parentheses end subscript

(ii) Change in Temperature-
 
The action of dilute sulphuric acid on zinc.
Zn space plus space straight H subscript 2 SO subscript 4 space rightwards arrow ZnSO subscript 4 space plus space straight H subscript 2
Heat is evolved in this reaction.
 
(3)Formation of Precipitate-

 Example:

When silver nitrate is added to sodium chloride, white insoluble precipitate of silver chloride is formed.

AgNO subscript 3 subscript open parentheses aq close parentheses end subscript space plus space space NaCl subscript aq space space space space rightwards arrow with space space space space on top space space space AgCl subscript open parentheses ppt close parentheses end subscript space downwards arrow space plus space NaNO subscript 3 subscript open parentheses aq close parentheses end subscript end subscript
 
When ferrous sulphate solution is added to the sodium hydroxide, a dirty green precipitate ferrous hydroxide is formed.
 
FeSO subscript 4 subscript open parentheses aq close parentheses end subscript end subscript space space plus space space 2 NaOH subscript open parentheses aq close parentheses end subscript space space rightwards arrow with space space on top space space space Fe open parentheses OH close parentheses subscript 2 space downwards arrow space space plus space Na subscript 2 SO subscript 4 subscript open parentheses aq close parentheses end subscript


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