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Reaction of Metals with Acid

An open U-tub...

Question

An open U-tube contains mercury. What should be column length of water to be poured into one of the limb so that difference of liquid level in the limbs is 2.0 cm? (r_Hg = 13.6 g/cc)

A

2.36 cm

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B

2.16 cm

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C

2.26 cm

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D

2.46 cm

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Solution

The correct option is B 2.16 cm

$X - \frac{X}{13.6} = 2.0$

$\frac{12.6 X}{13.6} = 2.0$
$X = \frac{68 \times 2}{63} = \frac{136}{63} c m$

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