Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

  • A
    Phosphorus pentoxide
  • B
    Active charcoal
  • C
    Anhydrous calcium chloride
  • D
    $Na_3PO_4$

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Isotope$(s)$ of hydrogen which emits low energy $\beta^{-}$ particle with $t_{1/2}$ value $> 12 \ years$ is/are :

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