Verified Solution • 2025–26 Session
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QJEEM21Ch9089: JEE Main 2021 Chemistry - Class 12 JEEM21Ch9089 Solution: Given below are two statements. One is labelled as Assertion A…
Given below are two statements. One is labelled as Assertion A nd the other is labelled as Reason R.
Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point.
Reason R : The viscosity of glass decreases on melting.
Choose the most appropriate answer from the options given below.
Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point.
Reason R : The viscosity of glass decreases on melting.
Choose the most appropriate answer from the options given below.
Multiple Choice Options
- A A is true but R is false
- B Both A and R are true but R is NOT the correct explanation of A.
- C A is false but R is true.
- D Both A and R are true and R is the correct explanation of A.
Step-by-Step Verified Solution
On heating the glass, it melts and takes up rounded shape at the edges, which has minimum surface area. This is due to the property of surface tension of liquids and not due to decrease in viscosity.
Viscosity generally decreases as the temperature increases.
Hence, both A and R are true but R is not the correct explanation of A.