The group of metals having positive value of P electron gain enthal...

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The group of metals having positive value of
P electron gain enthalpy is:

W
(1) \( \mathrm{Cr}, \mathrm{Fe} \)
(2) \( \mathrm{Mn}, \mathrm{Zn} \)
(3) \( \mathrm{Fe}, \mathrm{Zn} \)
(4) \( \mathrm{Cr}, \mathrm{Mn} \)
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