Which statement is not true with respect to nitrate ion test?
- A dark brown ring is formed at the junction of two solutions
- Ring is formed due to nitroferrous sulphate complex
- The brown complex is \([Fe(H_2O)_5 (NO)]SO_4\).
- Heating the nitrate salt with conc. \(H_2SO_4\), light brown fumes are evolved.
The Correct Option is B
Solution and Explanation
Brown Ring Test
\(NO_3^−+3Fe^{2+}+4H^+ →NO+3Fe^{3+} + 2H_2O\)
\([Fe(H2O)6]^{2+} NO → [Fe(H_2O)_5NO]^{2+} H_2O\)
Brown ring
So, the correct option is (B): Ring is formed due to nitroferrous sulphate complex.
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.