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1.

A. $N a_{2} C O_{3 .} 10 H_{2} O$
B. $N a_{2} C O_{3 .} 10 H_{2} O$
C. $N a_{2} C O_{3 .} 10 H_{2} O$
D. $N a_{2} C O_{3 .} 10 H_{2} O$

Answer: Option A

Explanation:

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