JEE Main · 2023 · 30 Jan 2023 · Shift 1 · Practical and Analytical Chemistry

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In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

(A) $Fe^{3 +}$ ✓ Correct
(B) $Zn^{2 +}$
(C) $Co^{2 +}$
(D) $Ni^{2 +}$

Answer: (A)

Solution

The fourth analytical group is precipitated as sulphides from an ammoniacal medium and holds the cations zinc, cobalt, nickel and manganese. Iron(III), by contrast, is thrown down as its hydroxide with aluminium and chromium in the third group, on adding ammonium chloride and ammonia. Being precipitated as a hydroxide and not as a fourth-group sulphide, the cation that does not belong to group four is iron(III).

JEE Main · 2023 · 30 Jan 2023 · Shift 1 · Single correct option

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