Question

Given the following information :
`A^(-)(g) rarr A^(2+) (g) + 3e^(-) DeltaH_(1) = 1400 KJ//"mole"`
`A (g) rarr A^(2+) (g) + 2e^(-) DeltaH_(2) = 700 KJ//"mole"`
`DeltaH_(eg) [A^(+)(g)] = -350 KJ//"mole"`
`IE_(1) + IE_(2)` for `A (g) = 950 KJ//"mole"`
The value of `IE_(1)` of `A^(-)` in KJ/mol is :
A. 450
B. `+350`
C. `+600`
D. `+ 250`

Answer 1

Correct Answer - B
`{:(A^(-)(g)rarrA(g)+e,,DeltaH_(eg)=-350 "kJ/mole"),(A^(+)(g)+e^(-)rarrA,,):}`
`{:(A^(-)rarrA+e^(-)),(ArarrA^(+)+e^(-)),(A^(+)rarrA^(+2)+e^(-)):}}1400 "kJ/mole"....("i")`
`{:(ArarrA^(+)+e^(-)),(A^(+)rarrA^(+2)+e^(-)):}}IE_(1)+IE_(2) "of" A = 950 "kJ/mole" ....("ii")`
Comparing (i) and (ii)
`A^(-)rarrA+e^(-)rArr 450 "kJ/mole"`