A vessel is filled with mercury to a height of \( 0.9 \mathrm{~m} \). Barometric height is \( 0....

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A vessel is filled with mercury to a height of \( 0.9 \mathrm{~m} \). Barometric height is \( 0.7 \mathrm{~m} \). mercury :
P
(A) the vessel can be completely emptied with the aid of a
W siphon
(B) the vessel cannot be emptied completely with the aid of a siphon
(C) the vessel can be emptied with at least \( 0.7 \mathrm{~m} \) height of mercury remaining in the vessel
(D) none of these
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