Advertisements
Advertisements
प्रश्न
Complete the following chart by writing appropriate words in the boxes marked (a) to (e).
उत्तर
(a) Solid
(b) Gaseous
(c) Well
(d) Lake
(e) Ice
APPEARS IN
संबंधित प्रश्न
Give reason On opening a bottle of a cold drink, a fizz sound is heard.
Water has ...................... density and .................. volume at 4°C.
Match the statements in column A with that in column B.
| Column A | Column B |
| (a) deliquescent substance | (1) sodium bicarbonate |
| (b) hygroscopic substance | (2) magnesium chloride |
| (c) efflorestance substance | (3) conc. sulphuric acid |
| (d) substance causing temporary hardness | (4) washing soda |
What is the smallest particle of water ? Describe it’s structure.
State whether the given statement are true or false. If true, write the reason.
Water availability per person in India is declining.
Explain why:
Table salts become sticky on exposure to humid air during the rainy season.
Compare the effect of soaps and detergents on hard water.
Answer in your own words.
Why is there a shortage of water even though it occupies about 71% of the earth’s surface?
Give the importance of dissolved air – in water.
Select the correct answer of the following statement:
A drying agent placed in desiccator.
Explain the following observation:
Washing-soda become coated with a white powder when left exposed to the atmosphere.
State the importance of water for all general uses.
Differentiate between the following:
Natural water and treated water
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 |
True or false? Correct the wrong statement.
We get rainwater throughout the year.
What is needed to construct a rain water harvesting pit?
Nitrogen is used for the treatment of drinking water.
What is the source of water in each of the following?
Wells
The jumbled word is given here. Write the correct form of each word.
CHARREGE
From where do the following usually get water? In which form is water present in them?
Clouds
