Which of the following statements is correct regarding the Tyndall effect? MCQ with Answer and Explanation

Explanation:
Ionization energy (IE) is the minimum energy needed to remove an electron from an isolated gaseous atom in its ground state to form a cation. A(g) → A⁺(g) + e⁻. Adding an electron is electron affinity. IE is an indicator of reactivity. Metals have low IE, non-metals high IE.

Explanation:
Mg goes from 0 to +2 oxidation state, losing electrons – oxidized. Oxygen is reduced (0 to -2). This is a combustion/combination redox reaction.

Explanation:
Soap solution is basic, pH > 8.3, so it turns phenolphthalein pink. Lemon juice (citric acid) and vinegar (acetic acid) are acidic, pH < 7, phenolphthalein remains colorless. Hydrochloric acid is strongly acidic, colorless. Phenolphthalein indicator is colorless in acidic and neutral, pink in alkaline solutions. It is used in titrations.