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Chapter 7: Problem 40

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct. Lassaigne's solution gives violet colouration with sodium nitroprusside. This indicates presence of (a) nitrogen (b) fluorine (c) chlorine (d) sulphur

Short Answer

Expert verified
Answer: (d) sulphur

Step by step solution

01

Understanding the Lassaigne's Test

Lassaigne's Test is a simple qualitative test performed to detect the presence of nitrogen, halogens, and sulfur in an organic compound. In this test, the organic compound is heated with sodium metal, and the resulting solution is called Lassaigne's solution, which is then reacted with various reagents to check for the presence of the mentioned elements.
02

Understanding the reaction with sodium nitroprusside

Sodium nitroprusside reacts with some specific elements to give different coloration. This property can be used to detect the elements present in the test solution. When Lassaigne's solution reacts with sodium nitroprusside and shows a violet colour, it indicates the presence of sulfur. It is important to note that nitrogen, fluorine, and chlorine do not exhibit this colour change with sodium nitroprusside.
03

Identify the correct option

Given the above information, we can now identify the correct option among the given choices. As we have found that sulfur is the element that gives the violet coloration with sodium nitroprusside in Lassaigne's Test, the correct answer is: (d) sulphur

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