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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
What is the contribution of chemistry in the following field?
National Defence
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 |
Write True or False against the following statement.
Chemistry plays an important role in the national economy:
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.
‘Alchemists are older words for Chemists’. Discuss the statement in brief.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A metallic apparatus which supports the wire gauze.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A glass apparatus that measures liquid by sucking the liquid at one end up to the marked level and later pouring it out.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A rectangular mesh with asbestos at its centre kept for initiating even distribution of heat to the bottom of the apparatus.
