Question

The molecular formula of epsom salt is

• A. $MgS{O}_4.6H_{2}O$
• B. $FeS{O}_4.7H_{2}O$
• C. $MgS{O}_4.7H_{2}O$
• D. None of these

Answer 1

The correct option is C

$MgS{O}_4.7H_{2}O$

Explanation for the correct answer:

(c) $MgS{O}_4.7H_{2}O$

Explanation for the wrong answer:

(a)$MgS{O}_4.6H_{2}O$: Magnesium sulfate hexahydrate is not the correct formula of epsom salt

(b)$FeS{O}_4.7H_{2}O$: Iron(II) sulphate also called ferrous sulfate is known as green vitriol and is not the correct formula of epsom salt.

Epsom salt is a hydrous magnesium sulfate, also known as magnesium sulphate heptahydrate.

Its chemical formula is: $MgS{O}_4.7H_{2}O$
(Here heptahydrate denotes seven water molecules in the salt.)