$A$ radioactive element resembling iodine in properties is

  • A
    Astatine
  • B
    Lead
  • C
    Radium
  • D
    Thorium

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$X_2$ is used in the refining of $Ti$ metal by the van Arkel method. $Y_2$ does not liberate $O_2$ from water and does not form $HY$ and $HOY$ with water. $X_2$ and $Y_2$ are respectively:

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