| 1 |
The process of removing temporary hardness of water. |
- A. Clark's method
- B. Washing soda method
- C. Sodium zeolite
- D. Filteration method
|
| 2 |
The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water. |
- A. Nitrogen
- B. Hydrogen
- C. Oxygen
- D. Carbon
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| 3 |
Which ion cause water hardness? |
- A. Al<sup>2</sup>
- B. Mg<sup>2</sup>
- C. Fe<sup>2</sup>
- D. Na<sup>2</sup>
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| 4 |
Calcium carbonate is in water. |
- A. Insoluble
- B. Sparingly
- C. None of them
- D. Soluble
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| 5 |
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>
|
| 6 |
Water become hard because of: |
- A. Ca+2
- B. Mg+2
- C. SO-24
- D. all of these
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| 7 |
Water molecule show structure. |
- A. Tetrahedral
- B. Trigonal
- C. Pentagonal
- D. All of them
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| 8 |
Which one of the following properties of water is responsible for rising of water in plants? |
- A. Specific heat capacity
- B. Viscosity
- C. Excellent solvent action
- D. Capillary action
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| 9 |
Density of water at 4°C is: |
- A. 0.976 gem-3
- B. 1 gem-3
- C. 0.956 gem-3
- D. 1.1 gem-3
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| 10 |
Sodium zeolite is naturally occurring reason of . |
- A. NaAl (SiO<sub>3</sub>)<sub>2</sub>
- B. Na<sub>2</sub>CO<sub>3</sub>
- C. CaCO<sub>3</sub>
- D. Na<sub>2</sub>SIO<sub>3</sub>
|