Which of the following transformations is endothermic in nature?

  • A
    $H_2O_{(\ell)} \rightarrow H_2O_{(s)}$
  • B
    $H_2O_{(s)} \rightarrow H_2O_{(\ell)}$
  • C
    $H_2O_{(g)} \rightarrow H_2O_{(\ell)}$
  • D
    $H_2O_{(g)} \rightarrow H_2O_{(s)}$

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