1. Tardigrade
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  3. Chemistry
  4. Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation (Δf H) of compounds

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Q. Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation $\left(\Delta_f H\right)$ of compounds

Thermodynamics

Solution:

Correct answer is (c) May be negative or positive