1. Tardigrade
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  3. Chemistry
  4. In which of the following Δ Hf would not be zero?

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Q. In which of the following $ \Delta H_{f} $ would not be zero?

Delhi UMET/DPMTDelhi UMET/DPMT 2006

Solution:

Red phosphorus has high $\Delta H_{f}$ because it is less reactive and it is not a stable allotropic form of phosphorus. So its $H_{f}$ would not be zero.