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Q.

The formula of washing soda is-

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a

Na2CO3

b

Na2CO3.H2O

c

Na2CO3.7H2O

d

Na2CO3.10H₂0

answer is D.

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Detailed Solution

  • Sodium carbonate decahydrate (Na2CO3.10H2O) is also referred to as washing soda. 
  • This is the most common hydrate of sodium carbonate containing 10 molecules of crystallizing water. 
  • The soda ash dissolves in water and crystallizes to form the washing soda. 
  • Washing soda can be achieved by heating the sodium bicarbonate.
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