Siphon will fail to work if
the densities of the liquid in the two vessels are equal
the level of the liquid in the two vessels are at the same height
both its limbs are of unequal length
the temperature of the liquids in the two vessels are the same
Option B
A tube used to convey liquid upwards from a reservoir and then down to a lower level of its own accord. Once the liquid has been forced into the tube, typically by suction or immersion, flow continues unaided.
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