A solution of $FeCl _3$ when treated with $K _{ t }\left[ Fe ( CN )_6\right]$ gives a prussiun blue precipitate due to the formation of
Show Hint
The formation of Prussian blue is a qualitative test for the presence of ferric ions (Fe3+) in solution
- $Fe \left[ Fe ( CN )_6\right]$
- $K \left[ Fe _2( CN )_6\right]$
- $Fe _4\left[ Fe ( CN )_6\right]_3$
- $Fe _3\left[ Fe ( CN )_6\right]_2$
The Correct Option is C
Solution and Explanation
The Prussian blue precipitate is formed when ferric ions (\( \text{Fe}^{3+} \)) react with hexacyanoferrate (\( [\text{Fe(CN)}_6]^{4-} \)) ions. The product of this reaction is \( \text{Fe}_4[\text{Fe(CN)}_6]_3 \), which is an insoluble complex that imparts the characteristic deep blue color.
Step 1: Ferric chloride (\( \text{FeCl}_3 \)) dissociates to produce \( \text{Fe}^{3+} \) ions in solution.
Step 2: Potassium hexacyanoferrate (\( \text{K}_4[\text{Fe(CN)}_6] \)) dissociates to produce \( [\text{Fe(CN)}_6]^{4-} \) ions in solution.
Step 3: \( \text{Fe}^{3+} \) ions combine with \( [\text{Fe(CN)}_6]^{4-} \) to form the insoluble complex \( \text{Fe}_4[\text{Fe(CN)}_6]_3 \), known as Prussian blue.
\( 4\text{Fe}^{3+} + 3[\text{Fe(CN)}_6]^{4-} \rightarrow \text{Fe}_4[\text{Fe(CN)}_6]_3 \downarrow \) (Prussian blue precipitate)
Top Questions on Colligative Properties
- Which of the following aqueous solutions will exhibit the highest boiling point?
- NEET (UG) - 2025
- Chemistry
- Colligative Properties
- HA $ (aq) \rightleftharpoons H^+ (aq) + A^- (aq) $ The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20 °C. The dissociation constant for the acid is Given: $ K_f(H_2O) = 1.8 \, \text{K kg mol}^{-1} $, molality ≡ molarity
- JEE Main - 2025
- Chemistry
- Colligative Properties
- The percentage dissociation of a salt (MX$_3$) solution at a given temperature (van't Hoff factor $i = 2$) is .................. % (Nearest integer)
- JEE Main - 2025
- Chemistry
- Colligative Properties
Given below are two statements:
Statement (I): Molal depression constant $ k_f $ is given by $ \frac{M_1 R T_f}{\Delta S_{\text{fus}}} $, where symbols have their usual meaning.
Statement (II): $ k_f $ for benzene is less than the $ k_f $ for water.
In light of the above statements, choose the most appropriate answer from the options given below:- JEE Main - 2025
- Chemistry
- Colligative Properties
- Find the osmotic pressure of $\dfrac{M{10}$ urea solution at $27^\circ\mathrm{C}$ \ (Given: $R=0.0821$ L\,atm\,K$^{-1}$\,mol$^{-1}$).}
- UP Board XII - 2025
- Chemistry
- Colligative Properties
Questions Asked in JEE Main exam
- The number of real solution(s) of the equation \( x^2 + 3x + 2 = \min \left( |x - 3|, |x + 2| \right) \) is:
- JEE Main - 2025
- Coordinate Geometry
- A 400 g solid cube having an edge of length \(10\) cm floats in water. How much volume of the cube is outside the water? (Given: density of water = \(1000 { kg/m}^3\))
Let $ P_n = \alpha^n + \beta^n $, $ n \in \mathbb{N} $. If $ P_{10} = 123,\ P_9 = 76,\ P_8 = 47 $ and $ P_1 = 1 $, then the quadratic equation having roots $ \alpha $ and $ \frac{1}{\beta} $ is:
- JEE Main - 2025
- Relations and functions
- Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is:
- JEE Main - 2025
- Solutions
In the given circuit the sliding contact is pulled outwards such that the electric current in the circuit changes at the rate of 8 A/s. At an instant when R is 12 Ω, the value of the current in the circuit will be A.- JEE Main - 2025
- Electrical Circuits
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.