A) \[N{{a}_{2}}S{{O}_{3}}.10{{H}_{2}}O\]
B) \[NaHC{{O}_{3}}\]
C) \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\]
D) \[Ca{{(OH)}_{2}}\]
Correct Answer: C
Solution :
Chemical formula of Washing Soda is\[\mathbf{N}{{\mathbf{a}}_{\mathbf{2}}}\mathbf{C}{{\mathbf{O}}_{\mathbf{3}}}\mathbf{.10}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\]. It can be used for removing permanent hardness of water. It is used in glass, soap and paper industries.
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