Observe the following reactions. Identify the reaction in which the hybridisation of the underlined atom is changed.

  • A
    $NH_3 + H^{+} \rightarrow NH_4^{+}$
  • B
    $PCl_3 + 3 H_2 O \rightarrow H_3 \underline{P}O_3 + 3 HCl$
  • C
    $Na\underline{N}O_3 + H_2 SO_4 \rightarrow NaHSO_4 + HNO_3$
  • D
    $XeF_6 + H_2 O \rightarrow \underline{Xe}OF_4 + 2 HF$

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