Ionization energy decreases down a group because: MCQ with Answer and Explanation

Explanation:
Manganese dioxide (MnO₂) catalyzes H₂O₂ decomposition: 2H₂O₂ → 2H₂O + O₂. Finely divided MnO₂ is added. Other catalysts include catalase enzyme.

Explanation:
Soap is made by saponification of triglycerides (fats/oils) which are esters of glycerol and long-chain fatty acids (e.g., stearic, palmitic, oleic). The sodium salt gives hard soap, potassium gives soft soap. The long hydrocarbon chain (hydrophobic) and carboxylate head (hydrophilic) provide cleaning action via micelle formation. Synthetic detergents are usually sodium salts of sulfonic acids or sulfate esters.

Explanation:
Vitamins are classified into fat-soluble (A, D, E, K) and water-soluble (B-complex and C) groups. Vitamin C (ascorbic acid) is water-soluble, meaning it dissolves in water and is not stored in the body to a significant extent, requiring regular dietary intake. Vitamins A, D, and K are fat-soluble.