The molecular formula of Glauber's salt is:

M g S O_{4} \cdot 7 H_{2} O

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C u S O_{4} \cdot 5 H_{2} O

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F e S O_{4} \cdot 7 H_{2} O

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N a S O_{4} \cdot 10 H_{2} O

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Solution

The correct option is D $N a S O_{4} \cdot 10 H_{2} O$
Glauber's salt, common name for sodium sulphate decahydrate, $N a_{2} S O_{4} .10 H_{2} O$ . It occurs as white or colourless monoclinic crystals. Upon exposure to fairly dry air, it effloresces, forming powdery anhydrous sodium sulphate.
Hence option D is correct.

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C u {S O}_{4} \cdot 5 H_{2} O

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