WATER MCQs 15 min Score: 0 Attempted: 0/15 Subscribe 1. . The percentage of water on our planet as compared to dry land is: (A) 76% (B) 75% (C) 77% (D) 78%Show All Answers 2. . The percentage of hydrogen to oxygen in water is: (A) 11.11 & 88.89 (B) 12 & 88 (C) 13 & 87 (D) 10 & 90Show All Answers 3. . The bond angle between H–O–H is: (A) 104.4° (B) 104.2° (C) 104.3° (D) 104.5°Show All Answers 4. . The most and readily soluble gas in water is: (A) CO (B) CO₂ (C) O₂ (D) N₂Show All Answers 5. . At 2000°C only ______ of water is dissociated: (A) 1% (B) 0.1% (C) 2% (D) 0.2%Show All Answers 6. . The density of water at 4°C is: (A) 3 g/cm³ (B) 2 g/cm³ (C) 1 g/cm³ (D) 4 g/cm³Show All Answers 7. . Bacteria, fungi and algae include: (A) Biological impurities (B) Suspended impurities (C) Dissolved impurities (D) All of theseShow All Answers 8. . The ion exchange resins are used in: (A) Salinity (B) Salivation (C) Desalination (D) SaltsShow All Answers 9. . The chemical name of water is: (A) Hydroxide (B) No one (C) Hydrogen peroxide (D) Hydrogen oxideShow All Answers 10. . The alternate name for the zeolite method is: (A) Ion exchange process (B) Deionisation process (C) Demineralisation process (D) Permutit methodShow All Answers 11. . The formula of cation exchange resin is: (A) R(OH)₂ (B) RH₃ (C) RH₂ (D) R(OH)₃Show All Answers 12. . Distilled water is an example of: (A) Soft water (B) Hard water (C) Impure water (D) Heavy waterShow All Answers 13. . Sodium zeolite absorbs ______ ion from hard water: (A) K⁺ (B) Ca²⁺ (C) Li⁺ (D) H⁺Show All Answers 14. . Water gas is a mixture of carbon monoxide and ______: (A) O₂ (B) N₂ (C) K₂O (D) CO₂Show All Answers 15. . Which one is an acidic oxide: (A) Na₂O (B) K₂O (C) MgO (D) CO₂Show All Answers