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प्रश्न
List any five precautions taken care of while performing an experiment in a chemistry laboratory.
उत्तर
Five precautions to be taken in the laboratory are:
- Do not touch or taste any unknown substance.
- Use only a small quantity of chemicals to carry out an experiment.
- Do not work alone in the laboratory.
- Do not throw hot concentrated acids into the sink directly.
- Always wear an apron in the laboratory to protect your clothes.
- While heating keeps the mouth of the test tube away from your eyes and face.
- The apparatus to be used in an experiment should be arranged neatly before beginning an experiment.
- Do not throw broken glass apparatus or used filter paper in the sink. Throw them in a dustbin.
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संबंधित प्रश्न
Mention one use of the following equipment
Wire gauze
From what material is the following made up of?
Measuring cylinder
From what material is the following made up of?
Mortar and pestle
From what material is the following made up of?
Wire gauze
Answer the following question in brief:
Why is chemistry known as an experimental science?
Fill in the blank:
_______ are used for grinding and crushing solid substances into a powder.
Match the words in Column A with their respective functions in Column B.
| Column A | Column B |
| (a) Iron stand | (i) To boil chemicals |
| (b) Test tube | (ii) To keep solution |
| (c) Funnel | (iii) To stir the solution |
| (d) Beaker | (iv) To support apparatus |
| (e) Glass rod | (v) To transfer the liquids |
Choose the correct alternative from the options given for the following statement.
The evaporating dish is made of
Write true or false against the following statement and correct it if false.
A test tube is used to test liquid chemicals.
Write true or false against the following statement and correct it if false.
A mortar and pestle are used for evaporation.
