A filter paper moistioned with ammonical sodium nitroprusside solution turns violet on contact with a drop of… · ABC26IN0684

Subject: Inorganic Chemistry · Chapter: d-Block Elements · Topic: D Block – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium

A filter paper moistioned with ammonical sodium nitroprusside solution turns violet on contact with a drop of alkaline $\mathrm{Na}_{2} \mathrm{S}$ solution. The violet colour is due to the formation of

(a)$\left[\mathrm{Fe}(\mathrm{SCN})_{5}(\mathrm{NO})\right]^{-}$

(b)$\left[\mathrm{Fe}(\mathrm{SCN})_{5}(\mathrm{NO})\right]^{2-}$

(c)$\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NOS})\right]^{3-}$

(d)$\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NOS})\right]^{4-}$

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

Sulfide adds to the nitrosyl of nitroprusside: [Fe(CN)₅(NOS)]⁴⁻ (violet) (d).

Study loop for d-Block Elements

1. Practise the PYQsPrevious-year questions, with answers

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