| 1 |
Temporary hardness can be removed by__________. |
- A. Quick lime
- B. Slaked lime
- C. Lime stone
- D. HCl
|
| 2 |
Chemical form of gypsum. |
- A. MgSO<sub>4</sub>. 5H<sub>2</sub>O
- B. CaSO<sub>4</sub>. 2H<sub>2</sub>O
- C. FeSO<sub>4</sub>. 5H<sub>2</sub>O
- D. CuSO<sub>4</sub>. 5H<sub>2</sub>O
|
| 3 |
How many percentage to water contains oceans? |
- A. 67%
- B. 77%
- C. 87%
- D. 97%
|
| 4 |
Boiling point of water is: |
- A. 0<sup>o</sup>C
- B. 25<sup>o</sup>C
- C. 80<sup>o</sup>C
- D. 100<sup>o</sup>C
|
| 5 |
Which of the following salt is soluble in water. |
- A. NaCl
- B. KCl
- C. Na<sub>2</sub>SO<sub>4</sub>
- D. All of them
|
| 6 |
Calcium carbonate is in water. |
- A. Insoluble
- B. Sparingly
- C. None of them
- D. Soluble
|
| 7 |
Permanent hardness can be removed by using . |
- A. Soda lime
- B. Sodium Zeolite
- C. Quick lime
- D. Lime water
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| 8 |
How many times the heat capacity of water is greater than that of rocks. |
- A. Two
- B. Three
- C. Four
- D. Six
|
| 9 |
Rapid growth of algae in water bodies in because of detergent having. |
- A. Carbonat salt
- B. Sulphonic acid
- C. Sulphat salt
- D. Phosphate salt
|
| 10 |
Water has a maximum density at 4 <sup>o</sup>C |
- A. 12 cm<sup>-3</sup>
- B. 2 g cm<sup>-3</sup>
- C. 1 g cm<sup>-3</sup>
- D. 4 gcm<sup>-3</sup>
|