The chemical formula of washing soda is:

${N a}_{2} {C O}_{3} . H_{2} 0$

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${N a}_{2} {C O}_{3}$

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$N a O H$

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${N a H C O}_{3}$

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Solution

The correct option is B
${N a}_{2} {C O}_{3}$

${N a}_{2} {C O}_{3}$ is also called washing soda. It is a carbonate salt of sodium. ${N a}_{2} {C O}_{3} . H_{2} 0$ represents sodium carbonate monohydrate. NaOH and $N a H C O_{3}$ are sodium hydroxide and sodium bicarbonate respectively.

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