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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn210

Iron(II) sulfate heptahydrate has how many oxygen atoms in one formula unit?

A $7$
B $12$
C $10$
D $11$

Answer: D

The formula is

FeSO X_{4} \cdot 7 H X_{2} O

. O atoms: 4 in sulfate plus 7 in water

= 11

.

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