Chemistry
To prevent the escape of a gas from a gas jar, you will cover its mouth with a:
- watch glass
- crucible
- beaker
- round bottom flask
Common Lab Apparatus
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Answer
watch glass
Reason — A watch glass is made up of glass. It is used to cover beakers or glass jars, as it prevents gas from escaping and also used like evaporating dish for very small amount of liquid.
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Related Questions
The apparatus used to measure an accurate volume of a liquid is:
- beaker
- conical flask
- measuring cylinder
- test tube
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- gas jar
- delivery tube
- glass rod
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(a) Experiment and …………… are the two important basics of chemistry.
(b) A porcelain dish is used ……………
(c) …………… is used to hold the test tube while it is hot or being heated.
(d) …………… is used for grinding and crushing solid substances into a powder.
(e) Glass apparatus is made of …………… or …………… glass.
Write true or false against the following statements and correct the false ones.
(a) A glass funnel is used to pour off liquids. ……………
(b) A test tube is used to test liquid chemicals. ……………
(c) A mortar and pestle is used for evaporation. ……………
(d) A glass rod is used to stir solutions. ……………
(e) A round-bottom flask is used to store chemicals. ……………