| 1 |
Which element do not causes toxicity in water? |
- A. Lead
- B. Arsenic
- C. Sodium
- D. Mercury
|
| 2 |
A disease is caused by excess of bile pigments in the blood is. |
- A. Typhoid
- B. Jaundice
- C. Cholera
- D. Dysentery
|
| 3 |
Which is not a heavy metal. |
- A. Cadmium
- B. Lead
- C. Zinc
- D. Murcury
|
| 4 |
Water become hard because of: |
- A. Ca+2
- B. Mg+2
- C. SO-24
- D. all of these
|
| 5 |
Mg<sup>2+</sup> and Ca<sup>2+</sup> ions react with soap to form calcium and magnesium salts of fatty acids called. |
- A. Gelatin
- B. Scum
- C. Paste
- D. None of them
|
| 6 |
Swimming pools are cleaned by a process: |
- A. Hydrogenation
- B. Bromination
- C. Chlorination
- D. Nitration
|
| 7 |
Temporary hardness is due to the presence of bicarbonates of. |
- A. Calcium
- B. Magnsium
- C. Both of them
- D. None of them
|
| 8 |
One H<sub>2</sub>O molecule can form hydrogen bonding with how many other H<sub>2</sub>O molecules? |
- A. One
- B. Two
- C. Three
- D. Four
|
| 9 |
Temporary hardness is because of. |
- A. Ca(HCO<sub>3</sub>)<sub>2</sub>
- B. CaCO<sub>3</sub>
- C. MgCO<sub>3</sub>
- D. MgSO<sub>4</sub>
|
| 10 |
The heat capacity of water is greater than rocks. |
- A. 4 times
- B. 5 times
- C. 6 times
- D. 7 times
|