NCERT Class XI Chemistry The p-Block Elements Solutions
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Question : 30
Total: 38
A certain salt X, gives the following results :
(i) Its aqueous solution is alkaline to litmus.
(ii) It swells up to a glassy material Y on strong heating.
(iii) When conc.H 2 S O 4
Write equations for all the above reactions and identify X, Y and Z.
(i) Its aqueous solution is alkaline to litmus.
(ii) It swells up to a glassy material Y on strong heating.
(iii) When conc.
Write equations for all the above reactions and identify X, Y and Z.
Solution:
The data suggests that the salt ‘X’ is Borax ( N a 2 B 4 O 7.10 H 2 O )
(i) The aqueous solution of borax is basic in nature due to hydrolysis and turns red litmus blue.
+ 7 H 2 O
+
(ii) Borax swells in size upon strong heating and loses molecules of water of crystallisation to form solid (Y).
N a 2 B 4 O 7 . 10 H 2 O
N a 2 B 4 O 7
(iii) Upon reacting with conc.H 2 S O 4 H 3 B O 3
When crystallised from the solution, it is in the form of white crystals (Z).
N a 2 B 4 O 7 + H 2 S O 4 + 5 H 2 O
(i) The aqueous solution of borax is basic in nature due to hydrolysis and turns red litmus blue.
(ii) Borax swells in size upon strong heating and loses molecules of water of crystallisation to form solid (Y).
(iii) Upon reacting with conc.
When crystallised from the solution, it is in the form of white crystals (Z).
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