Cr3+is more stable in aqueous solution due to higher hydration energy which is due to smaller size and higher charge.

Why are Cr3 is more stable than Mn2+?

ANS: (i) It is because Cr2+ loses electron to become Cr3+ which is more stable due to half filled t2g orbitals, whereas Mn3+ will gain electron to become Mn2+ which is more stable due to half filled Page 2 2 d-orbitals.

Which is more stable Cr3+ or Cr6+?

As Cr3+ is more stable than Cr6+ in acid solution, the reductive reaction proceeds mainly as (Cr6+ leads to Cr3+). ... Thus, the mechanisms and reactions between strong acids and chromium are very complicated.