CBSE (Science) Class 11CBSE
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Solution for In the Lassaigne’S Test for Nitrogen in an Organic Compound, the Prussian Blue Colour is Obtained Due to the Formation Of: - CBSE (Science) Class 11 - Chemistry

Login
Create free account


      Forgot password?

Question

In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:

(a) Na4[Fe(CN)6]

(b) Fe4[Fe(CN)6]3 

(c) Fe2[Fe(CN)6]

(d) Fe3[Fe(CN)6]4

Solution

In the Lassaigne’s test for nitrogen in an organic compound, the sodium fusion extract is boiled with iron (II) sulphate and then acidified with sulphuric acid. In the process, sodium cyanide first reacts with iron (II) sulphate and forms sodium hexacyanoferrate (II). Then, on heating with sulphuric acid, some iron (II) gets oxidised to form iron (III) hexacyanoferrate (II), which is Prussian blue in colour. The chemical equations involved in the reaction can be represented as

`6CN^(-) + Fe^(2+) -> [Fe(CN)_6]^(4-)`

Hence, the Prussian blue colour is due to the formation of Fe4[Fe(CN)6]3.

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2016 to Current)
Chapter 12: Organic Chemistry - Some Basic Principles and Techniques
Q: 37 | Page no. 364
Solution In the Lassaigne’S Test for Nitrogen in an Organic Compound, the Prussian Blue Colour is Obtained Due to the Formation Of: Concept: Qualitative Analysis of Organic Compounds - Detection of Other Elements.
S
View in app×