The chemical formula of washing soda is

NaCl

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{NaNO}_{3}

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{Na}_{2} {CO}_{3}

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{NaHCO}_{3}

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Solution

The correct option is C ${Na}_{2} {CO}_{3}$
The chemical formula of washing soda or sodium carbonate is ${Na}_{2} {CO}_{3}$ . It is added to hard water to remove its hardness and also used in purification of water.

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