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A \( 10.0 \mathrm{~cm} \) gas column is trapped by a column of \( \mathrm{Hg} 4 \mathrm{~cm} \) long in capillary tube of uniform bore. The tube is held horizontally in a room at \( 1 \mathrm{~atm} \). Length of the air column when the tube is held vertically with the open end up is
(a) \( 3.50 \mathrm{~cm} \)
(b) \( 9,50 \mathrm{~cm} \)
(c) \( 6.20 \mathrm{~cm} \)
(d) \( 4.80 \mathrm{~cm} \)
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