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प्रश्न
Why is it said that seawater is useful even though it is not potable?
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उत्तर
- Water from oceans can be used for making hydroelectricity, a form of renewable energy.
- It can be used as a low-cost mode of transport.
- They can be used for activities like scuba diving and other water sports, which help boost a country's tourism and economic growth.
- Nuclear power plants require coolants like water to bring down the temperature of the reactors. For this purpose, several gallons of water are required and this demand is fulfilled by the water from oceans.
- They support a variety of flora and fauna that have both ecological and economic value.
संबंधित प्रश्न
Name the two gases from which water is formed. What is the chemical composition of these two gases in water ?
Give reason of Alcohol is mixed with water and is used in car radiator.
Give one word for the following statement :
The change of states of water from one form to another .
Explain how the peculiar variation of density of water with temperature can protect marine-life.
What are its causes and how can water pollution be controlled ?
Answer the following question.
Suggest three ways to conserve water.
Compare the effect of soaps and detergents on hard water.
Give a balanced equation for the following conversion:
Potassium oxide to a strong alkali.
State the importance of water for all general uses.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
