Question

20.The crystals of compound A on keeping in air get converted into white powder. Its solution in water
gives blue colour with red litmus. It is used to remove permanent hardness of water.
(a) Identify the substance. Write chemical formula for its crystalline form.
(b) From given information, identify the nature of substance.
(c) Write two more uses of that substance.​

Answer 1

(a)  Compound A is the washing soda with formula Na2CO3.10H2O

 

(b) It is basic in nature  

 

(c) Uses:

     (i) Used in manufacturing of glass, soap, paper.

     (ii) Used for washing clothes.

Answer 2

A) Na2CO3 . 10H2O

B) Its basic in nature as it turn red litmus into blue...

C) For moving permanent hardness of. Water

And,

Used for making glasses

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