Sarthaks Test
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The angle of contact at the interface of water-glass is 0°, Ethylalcohol-glass is 0°, Mercury-glass is 140° and Methyliodideglass 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 in the trough is 

(a) water 

(b) ethylalcohol 

(c) mercury 

(d) methyliodide.

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The liquid in the trough is (c) mercury 

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