JEE Main · 2026 · 24 Jan 2026 · Shift 2 · d and f Block Elements

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"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

(A)green✓ Correct
(B)purple
(C)yellow
(D)orange

Answer: (A)

Solution

The lightest element of group 7 (the manganese triad) is manganese. Its oxoanion with the metal in the

+ 6

state is the manganate ion,

M n O_{4}^{2 -}

. The potassium salt of this ion,

K_{2} M n O_{4}

, is green; the

+ 7

permanganate

K M n O_{4}

is purple. The colour of the potassium salt of X is green.

JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Single correct option

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