Correct option is B
The correct answer is: (b) Mg(OH)₂
Explanation:
 ·   Magnesium Hydroxide is an   inorganic compound with the chemical formula   Mg(OH)₂.  
 · It consists of   one magnesium ion (Mg²⁺) and   two hydroxide ions (OH⁻) to balance the charges.  
 · Commonly known as   milk of magnesia, used as an   antacid and laxative.  
Information Booster:
 · Mg²⁺ ion has a charge of +2; each OH⁻ has −1 charge.  
 · Therefore,   two hydroxide ions are needed to balance one magnesium ion.  
 · Slightly soluble in water, forms a suspension called   milk of magnesia.  
 · Neutralizes stomach acid by reacting with HCl.  
 · Appears as a white solid.  
 · Used in fireproofing and wastewater treatment.  
