Question:
Write the preparation of potassium dichromate from chromite ore.
Write the preparation of potassium dichromate from chromite ore.
Show Hint
Potassium dichromate is a powerful oxidizing agent used in redox reactions and analytical chemistry.
Updated On: Mar 4, 2025
Hide Solution
Verified By Collegedunia
Solution and Explanation
Potassium dichromate \( (K_2Cr_2O_7) \) is prepared from chromite ore \( (FeCr_2O_4) \) through the following
steps: 1. Roasting with Sodium Carbonate: \[ FeCr_2O_4 + 4Na_2CO_3 + 7O_2 \rightarrow 2Na_2CrO_4 + 2Fe_2O_3 + 4CO_2 \]
2. Conversion to Dichromate: \[ 2Na_2CrO_4 + H_2SO_4 \rightarrow Na_2Cr_2O_7 + Na_2SO_4 + H_2O \]
3. Formation of Potassium Dichromate: \[ Na_2Cr_2O_7 + 2KCl \rightarrow K_2Cr_2O_7 + 2NaCl \]
Was this answer helpful?
0
0
Top Questions on Inorganic chemistry
- When a brown coloured salt (A) of Mn reacts with HCl, a gas (B) is obtained. This gas in excess reacts with NH$_3$ to form an explosive salt (C). Identify (A), (B) and (C) and write the chemical equations.
- UP Board XII - 2025
- Chemistry
- Inorganic chemistry
- What happens when—
(i) Chromite ore reacts with potassium carbonate in presence of air.
(ii) Potassium dichromate reacts with ferrous sulphate in presence of sulphuric acid.
(iii) Potassium permanganate is heated up to 513 K.- UP Board XII - 2025
- Chemistry
- Inorganic chemistry
- Describe the method of preparation of potassium permanganate. How does acidic potassium permanganate react with the following? Give ionic equations: (i) H$_2$S (ii) Fe (iii) iodide ion.
- UP Board XII - 2025
- Chemistry
- Inorganic chemistry
- Why metals show their maximum oxidation states in oxides and fluorides?
- UP Board XII - 2025
- Chemistry
- Inorganic chemistry
- Write the color of following metal ions in aqueous solution:
- UP Board XII - 2025
- Chemistry
- Inorganic chemistry
View More Questions
Questions Asked in MH Board Class XII exam
- Explain unique features of acquired immunity.
- MH Board Class XII - 2024
- Immune System
- Explain the buffer action of the sodium acetate-acetic acid buffer.
- MH Board Class XII - 2024
- Thermodynamics
Explain the construction of a spherical wavefront by using Huygens' principle.
- Give the name of the endocrine gland which is prominent at birth but gets gradually atrophied in the adult stage.
- MH Board Class XII - 2024
- Human Endocrine System
The slope of the tangent to the curve \( x = \sin\theta \) and \( y = \cos 2\theta \) at \( \theta = \frac{\pi}{6} \) is ___________.
- MH Board Class XII - 2024
- Differentiation
View More Questions