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6. The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is

104. The height of the hill is

(a)  250 m                                              (b)   2.5 km

(c)   1.25 km                                           (d)   750 m

Answer-b

(4)

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