A. Sodium chloride
A.
B. Magnesium sulfate
B.
C. Calcium carbonate
C.
D. Potassium nitrate
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Epsom salt is chemically known as magnesium sulfate (MgSO₄·7H₂O), commonly used in medicine and agriculture.