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Q.

How many molecules of water of crystallization are present in washing soda?


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a

2

b

5

c

6

d

10 

answer is D.

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Detailed Solution

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10 molecules of water of crystallization are present in washing soda.
Washing soda is a decahydrate of sodium carbonate (Na2CO3.10H2O). The water of crystallization is a fixed number of water molecules present in one formula unit of salt. In sodium carbonate decahydrate (Na2CO3.10H2O) water of crystallization is 10. It's a useful laboratory reagent and is used in cleaning.
 
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