A $U$ tube contains water and methylated spirit separated by mercury . The mercury columns in the two arms are at the same level with $10\,cm$ of water in one arm and $12.5\,cm$ of spirit in the other as shown in figure. The relative density of the spirit is

829-280

  • A

    $0.6$

  • B

    $0.8$

  • C

    $1.0$

  • D

    $1.25$

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