Advertisements
Advertisements
Question
A jumbled word is given here. Write the correct form of the word.
CHARREGE
Advertisements
Solution
RECHARGE
APPEARS IN
RELATED QUESTIONS
Why is water very precious for all living being ?
Give balanced chemical equation for the reaction of water with Sodium oxide.
Name the gas produced when steam is passed over hot coke.
.................... is the purest form of natural water.
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 |
Give one word for the following statement:
The harmful substances dissolved in water .
The ultimate source of all water on the earth is
What causes the violence associated with torrential rain?
Give reason for the following:
The percentage of oxygen, in air dissolved in water, is higher than the percentage of oxygen in ordinary air.
Select the correct word from the words in option to complete the sentence:
If pressure on the surface of water increases its boiling point ____ and freezing point ____.
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 |
Pour water from the ice tray into a kettle. Ask an elder at your home to heat the kettle and observe the mouth of the kettle when the water starts boiling.
What do you see?
Name the process which is responsible for the formation of droplets on the surface of a glass of cold drink. _______
________ of water is in oceans and seas.
Match Column I with Column II
| Column I | Column II | ||
| (a) | Ground water | (i) | Solid form of water |
| (b) | Bawri | (ii) | Wastage of water |
| (c) | Snow | (iii) | Water management |
| (d) | Drip irrigation | (iv) | Small water |
| (e) | Leaking taps | (v) | Water table |
What is saltwater?
Write any two activities which require more than a bucket of water.
