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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn089

Ammonium iron(II) sulfate hexahydrate has one $Fe X^{2 +}$ , ammonium ions and sulfate ions in the smallest whole-number ratio that is neutral. How many hydrogen atoms are in one formula unit?

A8
B12
C20
D24

Answer: C

One

Fe X^{2 +}

(

+ 2

) with two

SO X_{4} X^{2 -}

(

- 4

) needs two

NH X_{4} X^{+}

:

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

. Hydrogen:

2 \times 4 = 8

from ammonium plus

6 \times 2 = 12

from water

= 20

.

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