The length of the mercury column will be more than 76 cm. The pressure depends on the height of the highest point of the mercury from the ground and not on the length of the liquid column.Let:l= Length of the mercury columnθ= Angle at which the tube is inclined with the vertical Given:​h=76 cmlcosθ=h or, l=cosθh​∴l>h​ Or I>76 cm