Which of the following elements is NOT a p-block element? MCQ with Answer and Explanation

Explanation:
Hydrochloric acid (HCl) dissociates completely in water, making it a strong acid. Acetic acid (CH₃COOH), carbonic acid (H₂CO₃), and citric acid are weak acids—they partially ionize. Other strong acids: H₂SO₄ (first dissociation), HNO₃, HBr, HI, HClO₄. Strong acids have very large Ka values. pH of 0.1 M HCl is about 1.

Explanation:
Mass is an extensive property, meaning it depends on the quantity of matter. Density, boiling point, and refractive index are intensive properties that remain constant regardless of the amount of substance. Intensive properties are useful for identifying substances. For example, pure water boils at 100°C at 1 atm irrespective of whether you have 10 mL or 10 L. Exam trick: Extensive properties like mass, volume, and length add up when you combine samples; intensive properties do not.

Explanation:
Inert electrodes do not participate in the chemical reaction; they merely provide a surface for electron transfer. Platinum and graphite are common inert electrodes. Copper, zinc, and silver are active electrodes and can dissolve or deposit during electrolysis, thereby participating in the chemical change.