JEE Main 2022 · 28 Jun · Shift 1 · Chemistry Q80

ChemistrySingle correct+4 / -1Question 80 of 90

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is

\mathrm{NaFe[Fe(CN)_6]}

\mathrm{Na[Cr(NH_3)_2(NCS)_4]}

\mathrm{Na_2[Fe(CN)_5(NO)]}

\mathrm{Na_4[Fe(CN)_5(NOS)]}

Answer and worked solution

Official answer: D

Test. $\mathrm{S^{2-}+[Fe(CN)_5NO]^{2-}\rightarrow[Fe(CN)_5NOS]^{4-}}$ , the purple $\mathrm{Na_4[Fe(CN)_5NOS]}$ .

(D)

JEE Main 2022 · 28 Jun · Shift 1, Chemistry question 80