Question

Cr - Cr2O3 - Cr2(SO4)3 - Cr(OH)3 - Cr2O5 - Cr(NO3)3

Answer 1

4Cr + 3O2 = 2Cr2O3 ↑°
Cr2O3 + 3 H2SO4 = Cr2(SO4)3 + 3 H2O
Cr2(SO4)3 + 6NaOH = 2Cr(OH)3 + 6 H2O
Cr(OH)3 + 3 NaOH = Na3CrO3 + 3 H2O↑°

Answer 2

The compounds you provided are related to chromium (Cr) and its various oxidation states. Here's some information about each compound:

1. Chromium (Cr): This is the elemental form of chromium, a transition metal with atomic number 24.

2. Chromium(III) oxide (Cr2O3): It is a green-colored compound commonly known as chromium(III) oxide or chromic oxide. It is used as a pigment in paints, inks, and ceramics.

3. Chromium(III) sulfate (Cr2(SO4)3): This compound consists of chromium in its +3 oxidation state bonded to sulfate ions. It is a violet-colored solid and is often used in the tanning industry and as a mordant in dyeing textiles.

4. Chromium(III) hydroxide (Cr(OH)3): This compound contains chromium in its +3 oxidation state bonded to hydroxide ions. It is a gelatinous green precipitate that can form when a solution containing chromium(III) ions is treated with a base.

5. Chromium(V) oxide (Cr2O5): Also known as chromium pentoxide, this compound contains chromium in its +5 oxidation state. It is a dark red solid and is a powerful oxidizing agent. It is used in organic synthesis and as a catalyst.

6. Chromium(III) nitrate (Cr(NO3)3): This compound contains chromium in its +3 oxidation state bonded to nitrate ions. It is a purple-colored solid and is commonly used as a mordant in textile dyeing.

These compounds represent different oxidation states of chromium and have various applications in different industries.