Lassaigne’s extract of thiourea, SC(NH2)2 is boiled with ferrous sulphate and then acidified with HCl, the colour of the resulting solution will be

Question

Lassaigne’s extract of thiourea, SC(NH2)2 is boiled with ferrous sulphate and then acidified with HCl, the colour of the resulting solution will be (A) prussian blue (B) green (C) black (D) red

Tardigrade Admin · Accepted Answer

Compounds having both N and S will form NaCNS leading to red coloured Fe(CN)3 during Lassaigne’s test for nitrogen

Q. Lassaigne’s extract of thiourea, $SC (N H_{2})_{2}$ is boiled with ferrous sulphate and then acidified with $H Cl$ , the colour of the resulting solution will be

prussian blue

green

black

red

Compounds having both N and S will form NaCNS leading to red coloured $F e (CN)_{3}$ during Lassaigne’s test for nitrogen

Q. Lassaigne’s extract of thiourea, SC(NH2​)2​ is boiled with ferrous sulphate and then acidified with HCl, the colour of the resulting solution will be

prussian blue

green

black

red

Compounds having both N and S will form NaCNS leading to red coloured Fe(CN)3​ during Lassaigne’s test for nitrogen

Q. Lassaigne’s extract of thiourea, $SC (N H_{2})_{2}$ is boiled with ferrous sulphate and then acidified with $H Cl$ , the colour of the resulting solution will be

Compounds having both N and S will form NaCNS leading to red coloured $F e (CN)_{3}$ during Lassaigne’s test for nitrogen