Seema Saini Solutions for Chapter: Purification of Organic Compounds (Qualitative and Quantitative), Exercise 2: DPP

Positive Beilstein test for halogen shows that:

For the detection of phosphorus, the organic compound after fusion with ${\mathrm{Na}}_2{\mathrm{O}}_2$ is extracted with water, boiled with ${\mathrm{HNO}}_3$ and then ammonium molybdate is added to it. A yellow precipitate is obtained, which is due to the formation of:

Sometimes, the colour observed in Lassaigne's test for nitrogen is green. It is because:

Which of the following compound will give white precipitate on heating with ${\mathrm{HNO}}_3$ followed by addition of silver nitrate?

Lassaigne's extract of thiourea, $\mathrm{S}=\mathrm{C}({\mathrm{NH}}_2{)}_2$ is boiled with ferrous sulphate and then acidified with $\mathrm{HCl}$, the colour of the resulting solution will be:

Lassaigne's test nitrogen is negative for which compound?

Which of the organic compound will give red colour in Lassaigne's test?

Detection of the chlorine is possible without preparing sodium extract in: