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ICSE Class 7 Answered

an empty glass bottle is fitted with a narrow tube at its mouth. the open end of the tube is kept in a beaker containing water. when the bottle is heated,bubbles of air are seen escaping into water. explain th reasopn.  
Asked by rolungmuans | 16 Sep, 2018, 06:08: PM
Expert Answer
- Eventhough the glass bottle is empty, there must be presence of ample amount of air in the bottle.
- On heating, carbon-di-oxide and other gases evolve and get transferred from the bottle to the beaker containing water through the tubes.
- That is why, when the bottle is heated, bubbles of air are seen escaping into water. 
Answered by Abhijeet Mishra | 17 Sep, 2018, 02:28: PM
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