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प्रश्न
State what are – ‘stain removals’. Name three important stain removers & give their prime functions.
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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:
Hard glass boiling tube
State the functions of the following basic glass apparatus:
Round bottom flask
State the method used for collecting the following gas:
Oxygen – a gas slightly soluble in water.
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.
Select the correct name from the choices given below for the following case.
The branch of Science which deals with the different forms of energy e.g. light and sound.
Select the correct name from the choices given below for the following case.
A chemical used as a preservative for jams, pickles, etc.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A long glass apparatus closed at one end used for collecting gases.
