What is Chromic oxide?

Cr2O3 is an inorganic compound through chemical name Chromic oxide. It is also called Dichromium trioxide, or Chromium (3+) oxide, or Chromium (III) oxide. It naturally occurs in a mineral eskolaite, which is mostly discovered in chromium-rich skarns, tremolite, chlorite veins, and also meta quartzites. Chromium (III) oxide shows up as a fine irradiate to dark green, hexagonal crystal. That is amphoteric and insoluble in water.

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Properties the Chromic oxide – Cr2O3

Cr2O3Chromic oxide
Molecular weight of Cr2O3151.9904 g/mol
Density of Chromic oxide5.22 g/cm3
Boiling allude of Chromic oxide4,000 °C
Melting allude of Chromic oxide2,435 °C

Chromic oxide structure – Cr2O3


The precise mass and the monoisotopic fixed of Chromium (3+) oxide is 151.866 g/mol. The number of hydrogen shortcut acceptors equates to to three and also the variety of hydrogen bond donors equals to zero. This compound is canonicalized and has 5 covalently external inspection unit.

Cr2O3 offers (Chromic oxide)

Chromic oxide is used in electric semiconductors.Used in the colouring glass.Used in cultivating senescence.Used in dyeing polymers.Used in the production of chromium metal.Used together a catalyst to prepare butadiene.Used in stainless stole polishing.Used together an anaesthetic.Used to include colours in drugs.Used in welding metals.

Production the Chromic oxide

In the year 1838, the Parisians Pannetier and Binet ready the transparent hydrated kind of Chromium (III) oxide. The is acquired from the mineral chromite. The counter of chromite come chromia is together follows:

Na2Cr2O7 + S → Na2SO4 + Cr2O3

The oxide can also be make by decomposing chromium salts or through exothermically decomposing ammonium dichromate.

(NH4)2Cr2O7 → Cr2O3 + N2 + 4 H2O

Chemical reactions:

Dichromium trioxide as soon as heated with finely divided aluminium or carbon reduces come chromium metal. The reaction is as follows:

Cr2O3 + 2Al → 2Cr + Al2O3

Heating Chromium (III) oxide through carbon and chlorine provides CrCl3 and also carbon monoxide (CO):

Cr2O3 + 3Cl2 + 3C → 2CrCl3 + 3CO

Oxidation the chromium (III) oxide outcomes in chromates:

2Cr2O3 + 4MO + 3O2 → 4MCrO4

Frequently asked Questions

Is chromic oxide acidic or basic?

Chromic oxide (or chromium(III) oxide) is an amphoteric compound. It has the capacity to dissolve in acids, liberating sign language chromium ions in the process. This hydrated Cr ions have the right to react v bases to form complex salts.
This link is an extremely useful in the procedure of stropping knife edges. That is additionally used for sprucing up the surface of optical devices and also for the dyeing that polymers.

What is the total charge on the Cr2O3 molecule?

The two chromium cations hold a charge of +3 each, amounting come a full of +6. Every oxygen ion stop a fee of -2, totalling to -6. The ionic compound is, therefore, neutral.

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Learn much more about the Structure, physical and chemical properties of Cr2O3 indigenous the experts at BYJU’S.