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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn145

Mohr's salt is named ammonium iron(II) sulfate hexahydrate. How many oxygen atoms are present in one formula unit?

A12
B16
C14
D8

Answer: C

Charges:

NH X_{4} X^{+}

is

+ 1

, Fe(II) is

+ 2

,

SO X_{4} X^{2 -}

is

- 2

, so the formula is

(NH X_{4}) X_{2} Fe (SO X_{4}) X_{2} \cdot 6 H X_{2} O

(

2 + 2 = 4

positive,

2 \times 2 = 4

negative). Oxygen:

2 \times 4 = 8

from sulfate plus

6

from water

= 14

.

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