Chromium Trivia Questions and Answers

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1: What is the primary element added to steel to make it highly resistant to corrosion and discoloration?
A: Nickel
B: Molybdenum
C: Chromium
D: Titanium
Correct Answer: C
Explanation: Chromium is added to steel to create stainless steel, which resists corrosion and discoloration.

2: What phase is chromium in at standard temperature and pressure (STP)?
A: Liquid
B: Solid
C: Gas
D: Plasma
Correct Answer: B
Explanation: Chromium is a solid at standard temperature and pressure.

3: What is the standard atomic weight of chromium?
A: 51.9961±0.0006
B: 50.989±0.01
C: 52.054±0.002
D: 49.944±0.003
Correct Answer: A
Explanation: The standard atomic weight of chromium is 51.9961±0.0006.

4: Which group is chromium in on the periodic table?
A: Group 4
B: Group 24
C: Group 6
D: Group 8
Correct Answer: C
Explanation: Chromium belongs to Group 6 of the periodic table.

5: What is the melting point of chromium in °C?
A: 1400 °C
B: 1907 °C
C: 2500 °C
D: 2671 °C
Correct Answer: B
Explanation: The melting point of chromium is 1907 °C.

6: What is the primary use of chromium, accounting for 85% of its commercial applications?
A: Battery production
B: Stainless steel and chromium plating
C: Jewelry making
D: Pigments
Correct Answer: B
Explanation: Stainless steel production and chromium plating make up 85% of chromium’s commercial uses.

7: What electron configuration does chromium have in its ground state?
A: [Ar] 3d3 4s2
B: [Ar] 3d5 4s1
C: [Ar] 3d4 4s2
D: [Ar] 3d6 4s0
Correct Answer: B
Explanation: The ground-state electron configuration of chromium is [Ar] 3d5 4s1.

8: What is the density of chromium at 20° C in g/cm³?
A: 6.1 g/cm³
B: 7.192 g/cm³
C: 5.9 g/cm³
D: 8.904 g/cm³
Correct Answer: B
Explanation: Chromium has a density of 7.192 g/cm³ at 20° C.

9: What crystal structure does chromium possess?
A: Face-centered cubic (fcc)
B: Hexagonal close-packed (hcp)
C: Body-centered cubic (bcc)
D: Simple cubic (sc)
Correct Answer: C
Explanation: Chromium has a body-centered cubic (bcc) crystal structure.

10: Who discovered chromium and in what year?
A: Antoine Lavoisier in 1803
B: Louis Nicolas Vauquelin in 1797
C: Dmitri Mendeleev in 1869
D: William Crookes in 1895
Correct Answer: B
Explanation: Louis Nicolas Vauquelin discovered chromium in 1797.

11: What is the common oxidation state of chromium in its compounds?
A: +1
B: +2
C: +3
D: +6
Correct Answer: C
Explanation: The +3 state is one of the most common oxidation states of chromium in compounds.

12: What color is typical for compounds containing chromate and dichromate anions?
A: Blue
B: Green
C: Yellow to orange
D: Purple
Correct Answer: C
Explanation: Chromate is yellow and dichromate is orange, both common colors for chromium compounds.

13: What is chromium’s role in human insulin and lipid metabolism in the United States?
A: It is essential
B: It has no role
C: It is toxic
D: It is an enzyme inhibitor
Correct Answer: A
Explanation: Trivalent chromium (Cr(III)) is considered an essential nutrient for insulin and lipid metabolism in the US.

14: Which European organization concluded insufficient evidence to recognize chromium as an essential nutrient in 2014?
A: European Central Bank (ECB)
B: European Space Agency (ESA)
C: European Food Safety Authority (EFSA)
D: European Chemicals Agency (ECHA)
Correct Answer: C
Explanation: The European Food Safety Authority (EFSA) concluded there was insufficient evidence to recognize chromium as essential.

15: What is the specific type of cubic crystal structure formed by passivated chromium oxide?
A: Carborundum
B: Spinel structure
C: Sphalerite
D: Fluorite
Correct Answer: B
Explanation: The protective oxide layer in passivated chromium forms a spinel structure.

16: What color is chromium metal when it is polished?
A: Black
B: Red
C: Yellow
D: Silvery metallic
Correct Answer: D
Explanation: Polished chromium has a silvery metallic appearance that is highly reflective.

17: Which term describes the magnetic ordering of chromium at room temperature?
A: Ferromagnetic
B: Paramagnetic
C: Antiferromagnetic
D: Diamagnetic
Correct Answer: C
Explanation: Chromium is antiferromagnetic at room temperature and below.

18: What is the CAS Number for chromium?
A: 7732-18-5
B: 7440-47-3
C: 7647-01-0
D: 7782-50-5
Correct Answer: B
Explanation: The CAS Number for chromium is 7440-47-3.

19: What happens to chromium’s magnetism above 38 °C?
A: Chromium becomes ferromagnetic
B: It remains antiferromagnetic
C: Chromium becomes paramagnetic
D: Chromium becomes non-magnetic
Correct Answer: C
Explanation: Above 38 °C, chromium becomes paramagnetic.

20: What property allows chromium to resist tarnishing?
A: High thermal expansion
B: High electron affinity
C: High density
D: High corrosion resistance
Correct Answer: D
Explanation: Chromium’s high corrosion resistance allows it to resist tarnishing.

21: Which type of radiation does polished chromium reflect almost 90% of?
A: Ultraviolet
B: Microwaves
C: Infrared light
D: X-rays
Correct Answer: C
Explanation: Polished chromium reflects nearly 90% of infrared light.

22: What is the common alloy produced from chromite ore to make stainless steel?
A: Ferromanganese
B: Ferrochromium
C: Ferronickel
D: Silicon iron
Correct Answer: B
Explanation: Ferrochromium, an iron-chromium alloy, is produced from chromite ore to make stainless steel.

23: What is the oxidation state of chromium in chromium trioxide (CrO3)?
A: +3
B: +4
C: +5
D: +6
Correct Answer: D
Explanation: Chromium in chromium trioxide (CrO3) has an oxidation state of +6.

24: What major health risk is associated with hexavalent chromium?
A: It causes diabetes
B: It is carcinogenic
C: It enhances muscle growth
D: It boosts immune systems
Correct Answer: B
Explanation: Hexavalent chromium is toxic and carcinogenic.

25: What is the most abundant isotope of chromium in nature?
A: 50Cr
B: 52Cr
C: 53Cr
D: 54Cr
Correct Answer: B
Explanation: 52Cr is the most abundant isotope of chromium, making up 83.8% of natural chromium.

26: What material is responsible for the characteristic red color in rubies?
A: Manganese
B: Iron
C: Chromium
D: Copper
Correct Answer: C
Explanation: Trace amounts of chromium cause the red color in rubies.

27: What is the boiling point of chromium in °C?
A: 2200 °C
B: 1300 °C
C: 4840 °C
D: 2671 °C
Correct Answer: D
Explanation: The boiling point of chromium is 2671 °C.

28: What is a well-known process in which chromium is used to coat other metals?
A: Galvanization
B: Electroplating
C: Anodizing
D: Vulcanization
Correct Answer: B
Explanation: Chromium is used in electroplating to coat other metals for decorative and protective purposes.

29: What is one of the primary minerals that chromium is mined from?
A: Hematite
B: Chromite
C: Bauxite
D: Malachite
Correct Answer: B
Explanation: Chromium is primarily mined from chromite ore.

30: How is chromium commonly used in the automotive and furniture industries?
A: As a catalyst
B: For making alloys
C: For reflective, decorative coating
D: As a bonding agent
Correct Answer: C
Explanation: Chromium is used for its reflective, decorative coating in automotive and furniture industries.

31: What is the atomic number of chromium?
A: 29
B: 24
C: 12
D: 7
Correct Answer: B
Explanation: Chromium has an atomic number of 24.

32: What industrial process reduces chromite ore to ferrochromium using aluminum or silicon?
A: Aluminothermic reaction
B: Hydrothermal reaction
C: Solvay process
D: Cyanidation
Correct Answer: A
Explanation: Ferrochromium is produced from chromite ore via an aluminothermic reaction.

33: What is the environmental concern related to chromium used in leather tanning?
A: It depletes ozone
B: It is highly carcinogenic
C: It causes water pollution
D: It increases soil acidity
Correct Answer: B
Explanation: Chromium in leather tanning processes, especially hexavalent chromium, is carcinogenic.

34: Chromium is used in high-temperature applications. What property does it give to materials?
A: High reflectivity
B: High ductility
C: High hardness
D: High elasticity
Correct Answer: C
Explanation: Chromium’s high hardness makes it suitable for high-temperature applications.

35: What synthetic gemstone relies on chromium to function in lasers?
A: Synthetic diamond
B: Synthetic sapphire
C: Synthetic ruby
D: Synthetic emerald
Correct Answer: C
Explanation: Synthetic rubies, which contain chromium, were used in the first laser.

36: Which chromium compound is a strong oxidizing agent and commonly used in laboratory cleaning mixtures?
A: Chromium(III) chloride
B: Chromium trioxide
C: Chromium(VI) oxide
D: Sodium chromate
Correct Answer: C
Explanation: Chromium(VI) oxide is a strong oxidizing agent used in laboratory cleaning solutions.

37: What percentage of Earth’s crust does chromium approximately make up?
A: 5%
B: 21%
C: 50%
D: 0.1%
Correct Answer: D
Explanation: Chromium makes up approximately 0.1% of Earth’s crust.

38: Chromium in its +6 oxidation state is known for forming oxyanions. What are these anions called?
A: Chlorates and perchlorates
B: Sulfates and bisulfates
C: Chromates and dichromates
D: Nitrates and nitrites
Correct Answer: C
Explanation: Chromates and dichromates are oxyanions formed by chromium in its +6 oxidation state.

39: The strength and durability of which kind of steel is significantly enhanced by adding chromium?
A: Carbon steel
B: High-speed tool steel
C: Stainless steel
D: Alloy steel
Correct Answer: C
Explanation: The addition of chromium creates stainless steel, which is highly resistant to corrosion.

40: What term describes chromium’s ability to reflect almost 70% of the visible spectrum?
A: Reflectance
B: Absorbance
C: Transmittance
D: Conductance
Correct Answer: A
Explanation: Chromium has high reflectance, reflecting almost 70% of the visible spectrum.

41: In which type of environment does chromium exhibit antiferromagnetic properties?
A: Under high pressure
B: Below 400 K
C: In aqueous solutions
D: At room temperature and below
Correct Answer: D
Explanation: Chromium exhibits antiferromagnetic properties at room temperature and below.

42: Which country is the leading producer of chromite ores?
A: Canada
B: Brazil
C: South Africa
D: Australia
Correct Answer: C
Explanation: South Africa is the leading producer of chromite ores.

43: What is the approximate speed of sound in thin rods of chromium at 20°C?
A: 3500 m/s
B: 4500 m/s
C: 5940 m/s
D: 7000 m/s
Correct Answer: C
Explanation: The speed of sound in thin rods of chromium at 20°C is about 5940 m/s.

44: Chromium forms a protective oxide layer in the presence of what element?
A: Nitrogen
B: Hydrogen
C: Oxygen
D: Sulfur
Correct Answer: C
Explanation: Chromium forms a protective oxide layer when exposed to oxygen.

45: What material accounts for the second highest usage of chromium after stainless steel?
A: Pigments
B: Wood treatment
C: Electroplating
D: Catalysts
Correct Answer: C
Explanation: Chromium electroplating accounts for the second highest usage after stainless steel.

46: Which technique can enhance the passivation of chromium?
A: Heat treatment
B: Electrolysis
C: Short contact with oxidizing acids
D: Cold working
Correct Answer: C
Explanation: Short contact with oxidizing acids like nitric acid can enhance chromium passivation.

47: What is one of the main health risks of chromium trioxide used in industrial processes?
A: It causes liver malfunction
B: It is a potential carcinogen
C: It leads to bone density loss
D: It disrupts neural activity
Correct Answer: B
Explanation: Chromium trioxide is a known carcinogen.

48: Which of the following compounds is used in high-performance audio and standard audio cassettes due to its magnetic properties?
A: Chromium(III) oxide
B: Chromium(III) sulfate
C: Chromium(IV) oxide
D: Potassium dichromate
Correct Answer: C
Explanation: Chromium(IV) oxide has excellent magnetic properties for use in audio tapes.

49: By what process is ferrochromium commonly produced from chromite ore?
A: Anodizing
B: Smelting
C: Electrolysis
D: Distillation
Correct Answer: B
Explanation: Smelting is the common process to produce ferrochromium from chromite ore.

50: Which type of chromium compound is used to improve the adherence of organic pigments to surfaces?
A: Chromium chloride
B: Chromium sulfate
C: Chromium nitrate
D: Chrome alum
Correct Answer: D
Explanation: Chrome alum (potassium chromium sulfate) is used as a mordant in dyeing fabrics.

51: How does the reflectance property of chromium vary in infrared and visible light?
A: Decreases significantly
B: Remains constant
C: Increases for infrared light
D: Decreases for visible light
Correct Answer: C
Explanation: Chromium’s reflectance increases up to 90% in infrared light.

52: At what temperature does chromium undergo paramagnetic ordering?
A: Above 38 °C
B: Below 100 °C
C: Above 60 °C
D: At 0 °C
Correct Answer: A
Explanation: Above 38 °C, chromium’s magnetic ordering becomes paramagnetic.

53: Chromium is mined as which ore?
A: Bauxite
B: Chromite
C: Hematite
D: Magnetite
Correct Answer: B
Explanation: Chromium is mined from chromite ore.

54: Name one health condition that hexavalent chromium (Cr(VI)) is specifically known to cause.
A: Diabetes
B: Stomach tumors
C: Dementia
D: Hypertension
Correct Answer: B
Explanation: Hexavalent chromium (Cr(VI)) has been linked to causing stomach tumors.

55: What chemical reaction process is used to produce sodium chromate from chromite ore?
A: Oxidative roasting
B: Hydrolysis
C: Neutralization
D: Fermentation
Correct Answer: A
Explanation: Oxidative roasting is used to produce sodium chromate from chromite ore.

56: Which color does rubies get from elemental chromium present in them?
A: Blue
B: Red
C: Green
D: Yellow
Correct Answer: B
Explanation: The red color in rubies is due to trace amounts of chromium.

57: How does chromium benefit metal alloys when added?
A: Increases elasticity
B: Enhances brittleness
C: Increases hardness and corrosion resistance
D: Increases malleability
Correct Answer: C
Explanation: Chromium enhances both hardness and corrosion resistance in metal alloys.

58: In commercial applications, by what percentage is chromite used in the United States primarily for stainless steel and chrome plating?
A: 65%
B: 85%
C: 50%
D: 40%
Correct Answer: B
Explanation: 85% of chromite is used for stainless steel and chrome plating in commercial applications.

59: How many stable isotopes does naturally occurring chromium have?
A: Two
B: Three
C: Four
D: Five
Correct Answer: C
Explanation: Naturally occurring chromium has four stable isotopes: 50Cr, 52Cr, 53Cr, and 54Cr.

60: What is the natural occurrence classification of chromium?
A: Synthetic
B: Radiogenic
C: Primordial
D: Man-made
Correct Answer: C
Explanation: Chromium is classified as primordial, meaning it has been present in its current form since the formation of the Earth.

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