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
Match List I with List II:
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
- Given below are two statements:
Statement I: Like nitrogen that can form ammonia, arsenic can form arsine.
Statement II: Antimony cannot form antimony pentoxide.
In the light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
- Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?
- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
Match List I with List II:
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
Which of the following statements are true?
A. Unlike Ga that has a very high melting point, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and C are not the same.
C. $Ar, K^{+}, Cl^{–}, Ca^{2+} and S^{2–}$ are all isoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si $>$ Al $>$ Mg $>$ Na.
E. The atomic radius of Cs is greater than that of Li and Rb.
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
Questions Asked in Maharashtra Class XII exam
- Write short notes: British East India Company:
- Maharashtra Class XII - 2025
- European Imperialism
- State the formula for magnetic induction produced by a current in a circular arc of a wire. Hence find the magnetic induction at the centre of a current carrying circular loop.
- Maharashtra Class XII - 2025
- Magnetic Field due to a Current Element
- Prepare an ‘Appeal’ on the topic ‘Women’s Security and Safety’ with the help of the following points: (100/150 words)
— Respect women’s rights
— Safety measures and support systems
— Collective responsibility
— Government initiatives
- Maharashtra Class XII - 2025
- Writing Skills
- Answer the following questions: % Question (i) Write the negation of the statement: \( \exists n \in \mathbb{N} \) such that \( n + 8 > 11 \).
- Maharashtra Class XII - 2025
- Quantifiers and Negation
- Derive the relation between half life and rate constant for a first order reaction.
- Maharashtra Class XII - 2025
- Chemical Kinetics