The angle of contact at the interface of water glassis 0^(@) ethylalcohol glassis 0^(@) mercury glass is 140^(@)and methyliodide glass is 30^(@)A glass capillary is put in a trough containing one of these four liquids . It is observed that the meniscus is convex.the liquid inthe trough is

The angle of contact at the interface of water glassis 0^(@) ethylalco

1.	The angle of contact at the interface of water glassis 0^(@) ethylalcohol glassis 0^(@) mercury glass is 140^(@)and methyliodide glass is 30^(@)A glass capillary is put in a trough containing one of these four liquids . It is observed that the meniscus is convex.the liquid inthe trough is
Answer» water ethylacohal MERCURY METHYLIODIDE Solution : If angleof contact `thetagt90^(@)` ,then meniscus will be CONVEX .Hence liquid of `theta=140^(@)`is mercury.