Question

Heat of formation, \( \Delta H_f \), of an explosive compound like NC\( _3 \) is:

• A. positive
• B. negative
• C. zero
• D. positive or negative

Hint:

Heat of formation for most explosive compounds is positive because they are less stable in their elemental form.

Answer 1

The Correct Option is A

Step 1: Understand heat of formation.
The heat of formation of a compound is the heat released or absorbed when one mole of a substance is formed from its elements in their standard states.
Step 2: Conclusion.
For explosive compounds like NC\(_3\), the heat of formation is positive, indicating energy absorption.
Final Answer: \[ \boxed{A} \]