A) \[{{H}_{P}}-{{H}_{R}}\]
B) \[{{H}_{R}}-{{H}_{P}}\]
C) \[{{E}_{P}}-{{E}_{R}}\]
D) None of these
Correct Answer: C
Solution :
\[\Delta {{E}_{v}}={{E}_{P}}-{{E}_{R}}\].
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