Which of the following 3d-metal ion will give the lowest enthalpy of hydration ( .Δ text hyd H ) when dissolved in water?

Question

Which of the following 3d-metal ion will give the lowest enthalpy of hydration ( .Δ text hyd H ) when dissolved in water? (A) Cr 2+ (B) Mn 2+ (C) Fe 2+ (D) Co 2+

Tardigrade Admin · Accepted Answer

Ion Δ H text Hyd . ° ( kJ / mole ) Cr2+ -1925 Mn2+ -1862 Fe2+ -1998 Co2+ -2079

Q. Which of the following 3d-metal ion will give the lowest enthalpy of hydration ( $Δ_{hyd} H)$ when dissolved in water?

$C r^{2 +}$

$M n^{2 +}$

$F e^{2 +}$

$C o^{2 +}$

Ion $Δ H_{Hyd .}^{\circ} (k J / m o l e)$

$C r^{2 +}$ -1925

$M n^{2 +}$ -1862

$F e^{2 +}$ -1998

$C o^{2 +}$ -2079

Ion	$Δ H_{Hyd .}^{\circ} (k J / m o l e)$
$C r^{2 +}$	-1925
$M n^{2 +}$	-1862
$F e^{2 +}$	-1998
$C o^{2 +}$	-2079

Q. Which of the following 3d-metal ion will give the lowest enthalpy of hydration ( Δhyd ​H) when dissolved in water?

Cr2+

Mn2+

Fe2+

Co2+