Question

Which of the following group of metals have positive value of electron gain enthalpy :-
(a)Cr, Fe
(b)Mn, Zn
(c)Fe, Zn
(d)Cr, Mn


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Answer 1

Answer:

feel zn because these are metald

Answer 2

QUESTION:-

Which of the following group of metals have positive value of electron gain enthalpy:-

• (a)Cr, Fe
• (b)Mn, Zn
• (c)Fe, Zn
• (d)Cr, Mn

ANSWER:-

• (b)Mn, Zn is the correct option.

EXPLANATION:-

• Electron gain enthalpy is occasionally also pertained to as Electron affinity although there is a minute distinction between them. Electron gain enthalpy is interpreted as the quantity of energy discharged when an electron is added to an isolated gaseous atom. During electron addition, energy can either be released or absorbed.

• Mn3+ ion has a relatively high tendency to gain an electron and create the much more stable Mn2+ ion. Hence, Mn has a positive value of electron gain enthalpy.

• When Zn gains another electron, it attains a stable electronic configuration. Regardless, in Zn, the 4s-subshell of the valence shell is already filled with two-electron. Hence, the electron-gain enthalpy value of Zn is positive.

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