Lassaigne's test for nitrogen is negative for which compound?

Which of the following substances gives a red color when its $Lassaigne's$ extract is treated with alkali and ferric chloride?

What can be inferred if a blood-red color is obtained in the Lassaigne's test?

Lassaigne's test is used for the detection of which of the following?

How is the silver halide obtained from an organic compound distinguished?

Given below are two statements :
Statement $I$ : Nitrogen,sulphur,halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.
Statement $II$ : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.
In the light of the above statements,choose the correct answer from the options given below :