JEE Main 2022 · 25 Jun · Shift 2 · Chemistry Q74

← JEE Main 2022 · 25 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 74 of 90

During halogen test, sodium fusion extract is boiled with concentrated $\mathrm{HNO_3}$ to

remove unreacted sodium

decompose cyanide or sulphide of sodium

extract halogen from organic compound

maintain the pH of extract.

Answer and worked solution

Official answer: B

Interference. $\mathrm{NaCN}$ and $\mathrm{Na_2S}$ would precipitate with $\mathrm{AgNO_3}$ ; boiling with concentrated $\mathrm{HNO_3}$ drives them off as HCN and $\mathrm{H_2S}$ before the halide test.

(B)

Topics:Qualitative and quantitative analysis of organic compounds

← Previous question Next question →

JEE Main 2022 · 25 Jun · Shift 2, Chemistry question 74