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