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Chromium is a lustrous, brittle, hard metal. It is silver-grey in color and can be highly polished. Chromium is unstable in oxygen, it immediately produces a thin oxide layer that is impermeable to oxygen and protects the metal below.
- Symbol of Chromium = Cr
- Atomic Number of Chromium = 24
- Atomic Mass of Chromium = 51.996 g.mol -1
- Discovered by = Vaughlin in 1797
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Key Terms: Chromium, Acid, Element, Halogen, Element, Periodic Table, Cr Component, Electronic Configuration, Atomic Structure
What is Chromium?
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The chromium component has a nuclear number 24 and is addressed in the occasional table as the Cr component. It is the main component in bunch six. chromium component is a brutal metal. It has a silver-dim appearance. And does not tarnish in air, when heated it burns and forms the green chromic oxide.
- The chromium electronic arrangement is given as Ar 3d⁵ 4s¹.
- This rationale behind the chromium electronic arrangement is clarified by the half-filled d orbital that is answerable for offering dependability.
- The Cr electronic design is trivalent and is a highly crucial supplement for the human body.
- This supplement is found in various hints of human insulin, sugar, lipid digestion, unsaturated fats, and that's just the beginning.
Chromium
Also Read:
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|---|---|---|
| Colour Transition Elements | Ammonium Acetate | Ammonium Persulfate |
| Californium | Chromate | Curium |
| Dichromate | Gadolinium | Inner Transition Elements |
Properties Of Chromium
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Properties of chromium are:
- The nuclear number of Chromium (Z): 24
- Gathering: bunch 6
- Enough said: period 4
- Square: d-block
- Component class: Transition metal
- The Chromium liquefying point is close to around 2180 K (1907 °C)
- Chromium edge of boiling over 2944 K (2671 °C, 4840 °F)
- Thickness: 7.19 g/cm3
- The hotness of combination: 21.0 kJ/mol
- The hotness of vaporization: 347 kJ/mol
Uses Of Chromium
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Uses of chromium are specified below:
- Chromium is utilized in the treated steel industry to fabricate and deliver a few amalgams. A plating of chromium gives a mirror finish to hardened steel. Vehicles and trucks have number plates comprised of hardened steel. These hardened steel parts contain chromium.
- Chromite is supposed to be the main mineral of chromium. It is found in Africa, India, Turkey, and Afghanistan.
- Rubies get the radiant red tone from chromium. Additionally, when treated with glass and an emerald green tone is delivered.
- In the cowhide business, the Cr component is utilized for tanning the calfskin items. In any case, throughout the process of things working out, this interaction has ended up being exceptionally poisonous, and accordingly, an elective cycle is being investigated.
- Chromium, when cleaned, sparkles like a mirror and mirrors the harmful layout of the metal.
- Different auto improvements contain Chromium or composites made out of chromium.
Indications Of Chromium Toxicity
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Blame openness to chromium, in any structure, prompts a few sicknesses. These sicknesses are accompanied by manifestations like nausea, regurgitation, dizziness, fever, and muscle cramps.
The power of these side effects can heighten and prompt more ongoing indications like renal disappointment, liver harm, respiratory parcel distress, and nephritis. Cellular breakdown in the lungs is a highly typical infection connected with openness to chromium.
Notwithstanding the lung, even the kidney and liver become a specific objective for chromium-assaulting particles. One ought to be extra cautious while devouring chromium-rich food things.
Chromium Infographics
Substance Properties Of Chromium
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Reaction of chromium with other substances:
- Chromium Reacts With The Halogens
Chromium responds with fluorine straightforwardly, i.e., F2 at 400°C and 200-300 climatic strain to give Chromium (VI) fluoride, CrF6.
Cr(s) + 3F2(g) → CrF6(s) yellow
Under milder conditions, chromium(V) fluoride, CrF5, is shaped.
2Cr(s) + 5F2(g) → 2CrF5(s) red
Cr responds with the incandescent lamp to give trihalide Chromium fluoride (III) in additional milder conditions.
2Cr(s) + 3F2(g) → 2CrF3(s) green
2Cr(s) + 3Cl2(g) → 2CrCl3(s) reddish−violet
- Chromium Reacts With Acids
The Cr component breaks up in a weak arrangement of hydrochloric corrosive to frame arrangements containing the Cr(II) particle together alongside H2 gas. Additionally, while responding with sulphuric corrosiveness, the particles become assault tough. Chromium metal doesn't react with nitric sarcasm or HNO3.
Cr(s) + 2HCl(aq) → Cr2 (aq) + 2Cl-(aq) + H2(g)
Things to Remember
- A plating of chromium gives a mirror finish to hardened steel.
- Chromium has hostile properties, making it reasonable for being used to create treated steel.
- Chromium was first found in the year 1797 by a French Chemist named Louis Nicolas Vauquelin.
- The chromium electronic setup gives the four stable isotopes.
- Stones of ruby and emerald contain hints of chromium.
Also Read:
Previous Year Questions
- The Oxidation Number Of Chromium In Potassium Dichromate Is.... [NEET- 1995]
- The Primary And Secondary Valencies Of Chromium In The Complex Ion Is…. [KEAM]
- What Is The Oxidation Number Of Chromium In Chromy….
Sample Questions
Ques. What is the chromium component utilized for? (3 Marks)
Ans: Chromium and other composites are utilized in tempered steel. For instance, on vehicles and bikes, chromium plating makes a smooth, silver completion that is exceptionally erosion safe. The metal is generally utilized as an impetus also. Chromium compounds are valued for their splendid shades of green, purple, red, and orange as colors.
Ques. What family does Chromium have a place with? (2 Marks)
Ans: On the given Periodic Table of Elements, Chromium is a progress metal in Group 6. In its unadulterated structure, Chromium is a shimmering, brilliant, hard metal with a vast completion appropriate for electroplating.
Ques. Is Chromium harmful to people? (2 Marks)
Ans: The wellbeing hazards related to chromium openness depend on its condition of oxidation. The hexavalent structure is harmful. Ulcerations, dermatitis, and hypersensitive skin responses can include unfavorable impacts of the hexavalent construction on the skin.
Ques. What illnesses can be brought about by Chromium? (3 Marks)
Ans: Utilizing inward breath and dermal way, Chromium is very harmful and causes a cellular breakdown in the lungs, nasal irritation, nasal ulcer, and touchiness responses like contact dermatitis and asthma. Chromium affects various parts of the insusceptible framework, which might add to immune stimulation or immunosuppression.
Ques. What standard mixtures are Chromium viewed as ready? (1 Marks)
Ans: Sodium chromate, potassium chromate, potassium dichromate, ammonium dichromate, and chromium trioxide are hexavalent Chromium intensifiers that are generally created.
Ques. Mention few properties of chromium. (5 Marks)
Ans. Properties if chromium are:-
- Enough said: period 4
- Square: d-block
- Component class: Transition metal
- The Chromium liquefying point is close to around 2180 K (1907 °C)
- Chromium edge of boiling over 2944 K (2671 °C, 4840 °F)
- Thickness: 7.19 g/cm3
Ques. What is chromium. (3 Marks)
Ans. Chromium is a lustrous, brittle, hard metal.It is silver-grey in color and can be highly polished. It is the main component in bunch six. Chromium component is a brutal metal. It has a silver-dim appearance. And does not tarnish in air, when heated it borns and forms the green chromic oxide.
The chromium electronic arrangement is given as Ar 3d⁵ 4s¹. This rationale behind the chromium electronic arrangement is clarified by the half-filled d orbital that is answerable for offering dependability.
Ques. What are the uses of chromium? Mention five use of chromium. (5 Marks)
Ans. Chromium is used at several places. Few of its uses are as follows:-
- Chromium is utilized in the treated steel industry to fabricate and deliver a few amalgams. A plating of chromium gives a mirror finish to hardened steel. Vehicles and trucks have number plates comprised of hardened steel. These hardened steel parts contain chromium.
- Chromite is supposed to be the main mineral of chromium. It is found in Africa, India, Turkey, and Afghanistan.
- Rubies get the radiant red tone from chromium. Additionally, when treated with glass and an emerald green tone is delivered.
- In the cowhide business, the Cr component is utilized for tanning the calfskin items. In any case, throughout the process of things working out, this interaction has ended up being exceptionally poisonous, and accordingly, an elective cycle is being investigated.
- Chromium, when cleaned, sparkles like a mirror and mirrors the harmful layout of the metal.
Ques. State reaction of chromium with halogens. (4 Marks)
Ans. Chromium responds with fluorine straightforwardly, i.e., F2 at 400°C and 200-300 climatic strain to give Chromium (VI) fluoride, CrF6.
Cr(s) + 3F2(g) → CrF6(s) yellow
Under milder conditions, chromium(V) fluoride, CrF5, is shaped.
2Cr(s) + 5F2(g) → 2CrF5(s) red
Cr responds with the incandescent lamp to give trihalide Chromium fluoride (III) in additional milder conditions.
2Cr(s) + 3F2(g) → 2CrF3(s) green
2Cr(s) + 3Cl2(g) → 2CrCl3(s) reddish−violet
Ques. What happens when chromium reacts with acid? (3 Marks)
Ans. The Cr component breaks up in a weak arrangement of hydrochloric corrosive to frame arrangements containing the Cr(II) particle together alongside H2 gas. Additionally, while responding with sulphuric corrosiveness, the particles become assault tough. Chromium metal doesn't react with nitric sarcasm or HNO3.
Cr(s) + 2HCl(aq) → Cr2+(aq) + 2Cl-(aq) + H2(g)
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