When a liquid is taken in a capillary tube, flat meniscus is observed. Choose the correct option.
A
Angle of contact is 90∘
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B
Cohesive forces between liquid molecules is greater than the adhesive forces between liquid molecules and glass
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C
Cohesive forces between liquid molecules is less than the adhesive forces between liquid molecules and glass.
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D
None of these
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Solution
The correct option is A Angle of contact is 90∘
We know,
When Fadhesive=Fcohesive
Flat meniscus is observed.
Also,
Angle of contact, θ=90∘
So, option (a) are correct.