Which polyatomic ionic compound is a white, crystalline powder used in fire extinguishers and to neutralise acids and bases?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Sodium Bicarbonate.
The polyatomic ionic compound you're referring to is sodium bicarbonate (NaHCO₃), commonly known as baking soda. It is a white, crystalline powder that has various uses, including in fire extinguishers, where it helps to smother flames by releasing carbon dioxide when heated. Sodium bicarbonate is also used to neutralize acids and bases, making it effective for various chemical reactions. It is widely used in households, industries, and laboratories for its versatile properties.