What is needed to construct a rain water harvesting pit?

One Line Answer

Boulders, gravels, and Coarse sand are needed to construct a rain water harvesting pit.

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Chapter 2: Water - Try to Answer [Page 76]

Chapter 2 Water
Try to Answer | Q IV. 5. | Page 76

Name the gas produced when steam is passed over hot coke.

Give one word for the following statement:

The harmful substances dissolved in water .

What do you mean by water pollution ?

Give balanced chemical equations to show the reaction between Coke and steam.

Identify A, B, C and D; first one is done for you.

Explain why:

Water is an excellent liquid to use in cooling systems.

What do you understand by soft water?

Answer in your own words.

Why is there a shortage of water even though it occupies about 71% of the earth’s surface?

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

Total earth’s surface covered by water is