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प्रश्न
State what are – ‘stain removals’. Name three important stain removers & give their prime functions.
उत्तर
Stain removals: It is the process of removing a mark or a stain left by one substance on a specific surface fabric. Most stains are removed by dissolving with a solvent.
Examples of stain removers:
| Substance |
Stain |
| Lemon juice | contains citric acid and is used for removing stains from fabrics. |
| Hydrogen peroxide | a mild bleaching agent also effective in removing stains. |
| Glycerine | it softens stains on wool |
संबंधित प्रश्न
Who is known as the Father of chemistry? Why?
Choose the correct alternative from the choices given below for the following statement:
Which one of the following is a pesticide?
State the functions of the following basic glass apparatus:
Glass test tube
State the function of
The clamp mounted on the rod of a retort stand
State the function of The tap at the base of a burette.
State the method used for collecting the following gas:
Sulphur dioxide – a gas highly soluble in water and heavier than air
‘Alchemists are older words for Chemists’. Discuss the statement in brief.
Match the apparatus A to J shown below with their correct names 1 to 10 given below:
1. Delivery Tube
2. Pipette
3. Wire gauze
4. Bee-hive shelf
5. Thistle funnel
6. Flat bottom flask
7. Test tube stand
8. Burette
9. Retort
10. Conical flask
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A long glass tube with a broad inlet at the top, which allows entry of the reactants into the round bottom flask, during laboratory preparations of gases.
Give reasons for the following
Alchemy was considered a pseudoscience.
