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JEE Main levelSingle correct optionDifficulty 2 of 3bn194

How many oxygen atoms are present in one formula unit of copper(II) sulfate pentahydrate?

A $9$
B $10$
C $4$
D $5$

Answer: A

The formula is

CuSO X_{4} \cdot 5 H X_{2} O

: 4 O in sulfate plus 5 O in water gives

4 + 5 = 9

.

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