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JEE Main levelSingle correct optionDifficulty 2 of 3bn126

Which is the formula of magnesium sulfate heptahydrate?

A $MgSO X_{4} \cdot 7 H X_{2} O$
B $MgSO X_{3} \cdot 7 H X_{2} O$
C $Mg (SO X_{4}) X_{2} \cdot 7 H X_{2} O$
D $MgSO X_{4} \cdot 5 H X_{2} O$

Answer: A

Mg X^{2 +}

and

SO X_{4} X^{2 -}

combine 1:1 to give

MgSO X_{4}

; hepta- means seven water molecules.

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