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কাপড় কাচা সোডার সঠিক সংকেত কি ?

N a_{2} C O_{3 .} 10 H_{2} O

N a H C O_{3 .} 10 H_{2} O

N a_{2} C O_{3 .} 5 H_{2} O

N a_{2} C O_{3}

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