Advertisements
Advertisements
प्रश्न
State what are – ‘stain removals’. Name three important stain removers & give their prime functions.
Advertisements
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
What kind of experiments did Alchemists do?
Name six such products, which we use daily.
How is the knowledge of chemistry important to mankind?
Who is known as the Father of chemistry? Why?
Match the following words in column A with those in column B:
| Column A | Column B | ||
| (a) | Clothing | (i) | toothpaste, cosmetics |
| (b) | Green Revolution | (ii) | nylon, wool |
| (c) | Building Material | (iii) | agriculture |
| (d) | Commodities of daily | (iv) | mortar, cement |
Select the correct name from the choices given below for the following case.
The scientist who formulated the Periodic Table.
Select the correct name from the choices given below for the following case.
Predecessors to the modern Chemist who created the ‘Philosopher's stone’.
Select the correct name from the choices given below for the following case.
A substance which dissolves grease & oil and is preferred as a – drain cleaner.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A glass apparatus resistant to chemicals, made of pyrex, and used for heating specific liquids.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A modern apparatus with an air regulator, used for heating purposes.
