Advertisements
Advertisements
प्रश्न
Dissolve two spoons of common salt in half a cup of water. Now if you want to get the salt back, what will you do?
Advertisements
उत्तर
We can get back the salt we dissolved in water by two methods:
- Either heating the salted water in a pan on a burner.
- Alternatively, keep the salted water pan in the sun.
In both ways, the water will evaporate in the form of water vapours and the salt will have to remain back in the pan.
APPEARS IN
संबंधित प्रश्न
Cleaning of water is a process of removing ______.
What do you mean by water pollution ?
What are its causes and how can water pollution be controlled ?
Household detergents contain mainly ______ and pollute water bodies.
State the causes of ‘eutrophication’.
Around 97% of water available on earth is ______ water.
Rivers from land, add minerals to seawater. Discuss how?
Open drain system is a breeding place for which of the following?
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
Write any two activities which require less than one bucket of water.
