Verified Solution • 2025–26 Session moderate

QJEEM20Che598: JEE Main 2020 Chemistry - Class 11 JEEM20Che598 Solution: Ferrous sulphate heptahydrate is used to fortify foods with…

Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00; O = 16.00

Step-by-Step Verified Solution

FeSO4.7H2O (M = 277.85)

PPM =
Mass of Iron
Mass of wheat
 ×\times 106

⇒\Rightarrow 10 =
Mass of Iron
100 ×\times 103
 ×\times 106

⇒\Rightarrow Mass of Iron = 1 gm

Molecular mass of FeSO4.7H2O is 277.85

55.85 gm iron is present in 277.85 gm of salt

1 gm iron is present in = 277.8555.85{{277.85} \over {55.85}} = 4.97 gm of salt.

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