The correct option is (d) NaHCO₃. Sodium bicarbonate is a mild, non-corrosive base commonly used in baking soda. It is safe, weakly alkaline, and does not harm or corrode, unlike strong bases such as sodium hydroxide or calcium hydroxide.
Class 10 Science Sample Paper for half yearly Exam 2025-26
Half Yearly Exam Sample Paper 2025-26
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The correct answer is (d) NaHCO₃ (sodium bicarbonate). Sodium bicarbonate (NaHCO₃), also called baking soda, is a mild and non-corrosive base. Unlike strong bases such as sodium hydroxide or calcium hydroxide, it does not cause harm to the skin. It is commonly used in baking, medicine (antacids), and cleaning, showing its safe and versatile basic nature.