Q. COMPLETE THE FOLLOWING ILLUSTRATIONS
1. Property due to gas is used in balloons.
2. Property due to which hydrogen gas is used in oxyacetylene flame
3. Property due to which blue flame and pop sound.

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Solution

1. Property due to gas is used in balloons : It is less dense as compared to air i.e lighter than air.
2. Property due to which hydrogen gas is used in oxyacetylene flame : It produces hotter flame on reaction with acetylene
3. Property due to which blue flame and pop sound: Lot of energy is produced on burning hydrogen gas which break the air barrier and ultimately resul in the production of sound.

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