JEE Main 2022 · 26 Jun · Shift 1 · Chemistry Q80

← JEE Main 2022 · 26 Jun · Shift 1

ChemistrySingle correct+4 / -1Question 80 of 90

Which statement is not true with respect to nitrate ion test ?

A dark brown ring is formed at the junction of two solutions.

Ring is formed due to nitroferrous sulphate complex.

The brown complex is

\mathrm{[Fe(H_2O)_5(NO)]SO_4}

Heating the nitrate salt with conc.

\mathrm{H_2SO_4}

, light brown fumes are evolved.

Answer and worked solution

Official answer: B

Brown ring test. A brown ring of $\mathrm{[Fe(H_2O)_5(NO)]SO_4}$ , nitrosoferrous sulphate, forms at the junction. Statement (B) calls it a "nitroferrous" sulphate complex, the wrong name; NTA's key marks it as the untrue statement.

(B)

Topics:Anion analysis

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JEE Main 2022 · 26 Jun · Shift 1, Chemistry question 80