JEE Main 202624 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 24 January
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- d and f Block Elements
JEE Main 2026 · 24 January · Evening Shift · Chemistry · d and f Block Elements
" X " is an oxoanion of the lightest element of group 7 (in the...
" X " is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in " X ". The color of the potassium salt of X is
Options
- Apurple
- Borange
- Cyellow
- Dgreen
Correct answer
D. green
Step-by-step solution
The lightest element of group 7 (considering transition metals) is manganese (Mn).
An oxoanion with Mn in +6 oxidation state is manganate, MnO₄²⁻.
In manganate, Mn exhibits +6 oxidation state (where oxygen is -2, so Mn + 4(-2) = -2, giving Mn = +6).
The potassium salt K₂MnO₄ (potassium manganate) is green in color.
This is distinct from permanganate KMnO₄ (where Mn is +7) which is purple.
The characteristic green color of manganate solutions and salts makes this the answer.
An oxoanion with Mn in +6 oxidation state is manganate, MnO₄²⁻.
In manganate, Mn exhibits +6 oxidation state (where oxygen is -2, so Mn + 4(-2) = -2, giving Mn = +6).
The potassium salt K₂MnO₄ (potassium manganate) is green in color.
This is distinct from permanganate KMnO₄ (where Mn is +7) which is purple.
The characteristic green color of manganate solutions and salts makes this the answer.