Write the preparation of potassium dichromate from chromite ore.
Show Hint
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: \[ Na_2Cr_2O_7 + 2KCl \rightarrow K_2Cr_2O_7 + 2NaCl \]
Top Questions on Inorganic chemistry
An aqueous solution of Co(ClO4)2·6H2O is light pink in colour. Addition of conc. HCl results in an intense blue coloured solution due to the formation of a new species. The new species among the following is:
[Given: Atomic number of Co = 27]
- GATE CY - 2025
- Chemistry
- Inorganic chemistry
- The phosphazene compound that acts as a superbase is
- GATE CY - 2025
- Chemistry
- Inorganic chemistry
Nature of compounds TeO₂ and TeH₂ is___________ and ______________respectively.
- JEE Main - 2025
- Chemistry
- Inorganic chemistry
- Lanthanoid ions with \(4f^7\) configuration are: (A) Eu\(^{2+}\) (B) Gd\(^{3+}\) (C) Eu\(^{3+}\) (D) Tb\(^{3+}\) (E) Sm\(^{2+}\) Choose the correct answer from the options given below:
- JEE Main - 2025
- Chemistry
- Inorganic chemistry
- Identify the inorganic sulphides that are yellow in colour: (A) \( ({NH}_4)_2{S} \)
(B) \( {PbS} \)
(C) \( {CuS} \)
(D) \( {As}_2{S}_3 \)
(E) \( {As}_2{S}_5 \)
Choose the correct answer from the options given below:- JEE Main - 2025
- Chemistry
- Inorganic chemistry
Questions Asked in MH Board Class XII exam
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
- Evaluate: \[ I = \int \frac{5e^x}{(e^x + 1)(e^{2x} + 9)} \, dx. \]
- MH Board Class XII - 2024
- Integration
- A box with a square base is to have an open top. The surface area of the box is 147 cm\(^2\). What should its dimensions be in order that the volume is largest?
- MH Board Class XII - 2024
- Optimization
- If \( x = f(t) \) and \( y = g(t) \) are differentiable functions of \( t \), so that \( y \) is a function of \( x \) and \( \frac{dx}{dt} \neq 0 \), then prove that: \[ \frac{dy}{dx} = \frac{\frac{dy}{dt}}{\frac{dx}{dt}}. \] Hence find \( \frac{dy}{dx} \), if \( x = at^2 \), \( y = 2at \).
- MH Board Class XII - 2024
- Differentiation
Solve the following L.P.P. by graphical method:
Maximize:
\[ z = 10x + 25y. \] Subject to: \[ 0 \leq x \leq 3, \quad 0 \leq y \leq 3, \quad x + y \leq 5. \]- MH Board Class XII - 2024
- Linear Programming