Calcium Trivia Questions and Answers

clear drinking glass with brown liquid

1: What is the atomic number of calcium?
A: 18
B: 19
C: 20
D: 21
Correct Answer: C
Explanation: The atomic number of calcium is 20, indicating it has 20 protons in its nucleus.

2: Who first isolated pure calcium?
A: Antoine Lavoisier
B: Joseph Black
C: Humphry Davy
D: Jöns Jakob Berzelius
Correct Answer: C
Explanation: Humphry Davy first isolated pure calcium in 1808 via electrolysis of its oxide.

3: What is the most common calcium compound found on Earth?
A: Calcium sulfate
B: Calcium fluoride
C: Calcium carbonate
D: Calcium nitrate
Correct Answer: C
Explanation: The most common calcium compound on Earth is calcium carbonate, which is found in limestone.

4: What is the symbol for calcium on the periodic table?
A: Ca
B: C
C: Cl
D: Cs
Correct Answer: A
Explanation: The symbol for calcium on the periodic table is Ca.

5: At what temperature does calcium metal melt?
A: 842°C
B: 1000°C
C: 1494°C
D: 1548°C
Correct Answer: A
Explanation: Calcium metal melts at 842°C.

6: In which crystal structure does calcium crystallize at room temperature?
A: Body-centered cubic
B: Face-centered cubic
C: Hexagonal close-packed
D: Simple cubic
Correct Answer: B
Explanation: Calcium crystallizes in the face-centered cubic arrangement at room temperature.

7: Which of the following is NOT a common source of calcium?
A: Dolomite
B: Limestone
C: Diamond
D: Gypsum
Correct Answer: C
Explanation: Diamond is an allotrope of carbon and not a common source of calcium.

8: What percentage of natural calcium is the isotope 40Ca?
A: 99.9%
B: 96.9%
C: 50.0%
D: 2.5%
Correct Answer: B
Explanation: The isotope 40Ca makes up 96.9% of all natural calcium.

9: How many electrons are there in a calcium atom?
A: 18
B: 19
C: 20
D: 21
Correct Answer: C
Explanation: A calcium atom has 20 electrons.

10: What is the electronegativity of calcium on the Pauling scale?
A: 0.98
B: 1.00
C: 1.50
D: 2.00
Correct Answer: B
Explanation: The electronegativity of calcium on the Pauling scale is 1.00.

11: Which calcium ion plays a vital role in signal transduction pathways and muscle contraction?
A: Ca+
B: Ca-
C: Ca2+
D: Ca3+
Correct Answer: C
Explanation: The calcium ion Ca2+ plays a vital role in physiological and biochemical processes such as signal transduction pathways and muscle contraction.

12: What color does calcium typically appear to be?
A: Dull gray, silver with a pale yellow tint
B: Shiny black
C: Golden brown
D: Bright red
Correct Answer: A
Explanation: Calcium appears dull gray, silver with a pale yellow tint.

13: What is the primary reason that pure calcium metal has few applications?
A: It is too expensive.
B: It is highly reactive.
C: It is too rare.
D: It is non-conductive.
Correct Answer: B
Explanation: Pure calcium metal has few applications due to its high reactivity.

14: Calcium ions are important for maintaining which physiological feature?
A: Blood sugar levels
B: Potential difference across cell membranes
C: Oxygen levels in blood
D: Body temperature
Correct Answer: B
Explanation: Calcium ions are important for maintaining the potential difference across excitable cell membranes.

15: Which historical figure suggested lime might be an oxide of a fundamental chemical element?
A: Joseph Black
B: Antoine Lavoisier
C: Humphry Davy
D: Jöns Jakob Berzelius
Correct Answer: B
Explanation: Antoine Lavoisier suggested that lime might be an oxide of a fundamental chemical element in 1789.

16: What is the primary use of metallic calcium in industry?
A: Jewellery making
B: Insulation
C: Steelmaking
D: Plastic manufacture
Correct Answer: C
Explanation: The largest use of metallic calcium is in steelmaking.

17: Which food is a rich source of calcium?
A: Beef
B: Bananas
C: Kale
D: Potatoes
Correct Answer: C
Explanation: Kale is a food rich in calcium.

18: What does the term “alkaline earth metal” refer to in the periodic table?
A: A group of metals that are very heavy
B: A group of elements with one valence electron
C: A group of metals in Group 2
D: A group of non-metals
Correct Answer: C
Explanation: “Alkaline earth metal” refers to metals in Group 2 of the periodic table.

19: What is the CAS Number for calcium?
A: 7440-70-2
B: 7704-34-9
C: 1309-37-1
D: 7446-09-5
Correct Answer: A
Explanation: The CAS Number for calcium is 7440-70-2.

20: What are the most common forms of calcium carbonate?
A: Limestone and chalk
B: Granite and basalt
C: Diamond and sapphire
D: Quartz and feldspar
Correct Answer: A
Explanation: The most common forms of calcium carbonate are limestone and chalk.

21: Which element is a close homolog to calcium?
A: Iron
B: Strontium
C: Lithium
D: Helium
Correct Answer: B
Explanation: Calcium’s physical and chemical properties are most similar to strontium.

22: What is the primary reaction of calcium with water?
A: It forms calcium nitrate.
B: It produces calcium hydroxide and hydrogen gas.
C: It forms calcium phosphate.
D: It decomposes to carbon dioxide.
Correct Answer: B
Explanation: Calcium reacts with water to produce calcium hydroxide and hydrogen gas.

23: What is the boiling point of calcium?
A: 1115 K
B: 1200 K
C: 1494 K
D: 1757 K
Correct Answer: D
Explanation: The boiling point of calcium is 1757 K.

24: Calcium’s role in neurotransmitter release occurs in:
A: Muscles
B: Kidneys
C: Neurons
D: Bones
Correct Answer: C
Explanation: Calcium ions play a vital role in neurotransmitter release from neurons.

25: What historical use of lime dates back to around 7000 BC?
A: Building material
B: Currency
C: Medicine
D: Cooking
Correct Answer: A
Explanation: Lime was used as a building material as far back as around 7000 BC.

26: What does the calcium ion Ca2+ regulate in muscles?
A: Energy production
B: Contraction
C: Oxygen supply
D: Waste removal
Correct Answer: B
Explanation: Calcium ion Ca2+ regulates the contraction of muscles.

27: Which state is calcium most commonly found in at standard temperature and pressure (STP)?
A: Gas
B: Liquid
C: Plasma
D: Solid
Correct Answer: D
Explanation: At standard temperature and pressure, calcium is found in a solid phase.

28: How many stable isotopes does natural calcium have?
A: 3
B: 4
C: 5
D: 6
Correct Answer: C
Explanation: Natural calcium has five stable isotopes: 40Ca, 42Ca, 43Ca, 44Ca, and 46Ca.

29: Which isotopic form of calcium has the longest half-life?
A: 41Ca
B: 43Ca
C: 45Ca
D: 48Ca
Correct Answer: D
Explanation: 48Ca has a half-life of about 4.3 × 1019 years, thus effectively stable.

30: How does calcium primarily react with oxygen?
A: Forms calcium sulfide
B: Forms calcium hydroxide
C: Forms calcium oxide
D: Forms calcium chloride
Correct Answer: C
Explanation: Calcium primarily reacts with oxygen to form calcium oxide.

31: Which category does calcium belong to in the periodic table?
A: Halogens
B: Noble gases
C: Alkaline earth metals
D: Transition metals
Correct Answer: C
Explanation: Calcium belongs to the alkaline earth metals in Group 2 of the periodic table.

32: In what type of reactions does calcium typically lose its valence electrons?
A: Oxidation
B: Neutralization
C: Precipitation
D: Reductions
Correct Answer: A
Explanation: Calcium typically loses its valence electrons in oxidation reactions to form a Ca2+ cation.

33: Natural water hardness is often characterized by what element?
A: Magnesium
B: Sodium
C: Calcium
D: Potassium
Correct Answer: C
Explanation: Natural water hardness is often characterized by the concentration of calcium ions.

34: What device uses calcium as an alloy to reduce self-discharging?
A: Solar panels
B: Wind turbines
C: Automotive batteries
D: LED lights
Correct Answer: C
Explanation: Calcium is used as an alloy in maintenance-free automotive batteries to reduce self-discharging.

35: How is calcium produced in the United States and Canada?
A: By reducing lime with aluminum at high temperatures
B: By heating calcium carbonate
C: By using hydroelectric power
D: By natural decomposition
Correct Answer: A
Explanation: In the United States and Canada, calcium is produced by reducing lime with aluminum at high temperatures.

36: Which mineral is primarily responsible for the calcium cycle’s link between tectonics, climate, and the carbon cycle?
A: Pyrite
B: Calcite
C: Feldspar
D: Diamond
Correct Answer: B
Explanation: Calcite, a form of calcium carbonate, plays a significant role in the calcium cycle’s link between tectonics, climate, and the carbon cycle.

37: What is the density of calcium metal at 20°C?
A: 0.9 g/cm³
B: 1.0 g/cm³
C: 1.526 g/cm³
D: 2.0 g/cm³
Correct Answer: C
Explanation: The density of calcium metal at 20°C is 1.526 g/cm³.

38: Which method is used to distinguish between calcium isotopes in geological applications?
A: Colorimetric analysis
B: Mass spectroscopy
C: X-ray diffraction
D: Ultraviolet spectroscopy
Correct Answer: B
Explanation: Mass spectroscopy is used to distinguish between calcium isotopes in geological applications.

39: What industry uses calcium compounds as bleaching agents?
A: Textile
B: Paper
C: Plastic
D: Automotive
Correct Answer: B
Explanation: The paper industry uses calcium compounds as bleaching agents.

40: What is the role of calcium ions in blood clotting?
A: To transport oxygen
B: To break down glucose
C: To aid in collagen formation
D: To facilitate the coagulation process
Correct Answer: D
Explanation: Calcium ions play a crucial role in facilitating the coagulation process in blood clotting.

41: Which compound is used in cement and electrical insulators?
A: Calcium chloride
B: Calcium nitrate
C: Calcium carbonate
D: Calcium sulfate
Correct Answer: C
Explanation: Calcium compounds such as calcium carbonate are used in cement and electrical insulators.

42: What role do calcium ions play in bone formation?
A: As a structural framework
B: As cofactors in metabolic pathways
C: As second messengers
D: In signal transduction
Correct Answer: A
Explanation: Calcium ions play a vital role in bone formation as a structural framework.

43: What natural occurrence form does calcium primarily derive from?
A: Metamorphic
B: Igneous
C: Sedimentary
D: Primordial
Correct Answer: D
Explanation: Calcium primarily occurs in its primordial form.

44: What is calcium iodide used for in the food industry?
A: As a flavor enhancer
B: As an antioxidant
C: As a bleaching agent
D: As a preservative
Correct Answer: C
Explanation: Calcium iodide is used as a bleaching agent in the food industry.

45: Which of the following is a secondary messenger role played by calcium ions in cells?
A: DNA replication
B: Bone formation
C: Signal transduction
D: Muscle relaxation
Correct Answer: C
Explanation: Calcium ions play a secondary messenger role in signal transduction pathways within cells.

46: Calcium ions contribute to maintaining which key physiological process?
A: Blood glucose levels
B: Blood clotting
C: Oxygen transport
D: Waste elimination
Correct Answer: B
Explanation: Calcium ions contribute significantly to blood clotting.

47: What is the chemical formula of calcium carbonate?
A: CaO
B: CaCO3
C: CaCl2
D: Ca(OH)2
Correct Answer: B
Explanation: The chemical formula of calcium carbonate is CaCO3.

48: Which isotope of calcium is used in studying metabolic bone disease?
A: 40Ca
B: 42Ca
C: 44Ca
D: 48Ca
Correct Answer: C
Explanation: The isotope 44Ca is used in studying metabolic bone diseases like osteoporosis.

49: Which body part derives significant structural support from calcium ions?
A: Skin
B: Eyes
C: Bones
D: Lungs
Correct Answer: C
Explanation: Bones derive significant structural support from calcium ions.

50: Which mythical region is famous for its calcium-rich travertine terraces?
A: Atlantis
B: Pamukkale
C: Shangri-La
D: El Dorado
Correct Answer: B
Explanation: Pamukkale in Turkey is famous for its calcium-rich travertine terraces.

51: What is the primary consequence of calcium deficiency?
A: Hyperactivity
B: Osteoporosis
C: Muscle hypertrophy
D: Respiratory issues
Correct Answer: B
Explanation: The primary consequence of calcium deficiency is osteoporosis.

52: Which calcium compound is commonly used in toothpaste as a polishing agent?
A: Calcium chloride
B: Calcium carbonate
C: Tricalcium phosphate
D: Calcium sulfite
Correct Answer: C
Explanation: Tricalcium phosphate is commonly used in toothpaste as a polishing agent.

53: What is the most common isotope of calcium with a natural abundance of 96.941%?
A: 42Ca
B: 43Ca
C: 40Ca
D: 44Ca
Correct Answer: C
Explanation: The isotope 40Ca has a natural abundance of 96.941%.

54: How does calcium assist in the fertilization process?
A: As a nutrient source
B: By providing energy
C: By acting as a secondary messenger
D: By aiding in genetic replication
Correct Answer: C
Explanation: Calcium ions act as a secondary messenger in the fertilization process.

55: Which alkaline earth metal is biologically very similar to calcium?
A: Magnesium
B: Strontium
C: Barium
D: Radium
Correct Answer: A
Explanation: Biologically, magnesium is very similar to calcium.

56: What does exposure to air do to calcium metal?
A: Makes it shiny
B: Forms a dark oxide-nitride layer
C: Turns it red
D: Makes it brittle
Correct Answer: B
Explanation: Calcium metal forms a dark oxide-nitride layer when exposed to air.

57: Which sea is home to aragonite beds, a source of calcium carbonate?
A: Mediterranean Sea
B: Red Sea
C: Caspian Sea
D: Baltic Sea
Correct Answer: B
Explanation: Aragonite beds, a source of calcium carbonate, are found in the Red Sea basins.

58: What type of materials predominantly contain calcium phosphate?
A: Plaster
B: Ceramics
C: Limestone
D: Bones
Correct Answer: D
Explanation: Bones predominantly contain calcium phosphate in the form of hydroxyapatite.

59: Which global organization lists calcium as an essential medicine?
A: Red Cross
B: UNICEF
C: World Health Organization
D: Doctors Without Borders
Correct Answer: C
Explanation: The World Health Organization lists calcium as an essential medicine.

60: What is the Pauling electronegativity value of calcium?
A: 0.98
B: 1.2
C: 1.00
D: 1.5
Correct Answer: C
Explanation: The Pauling electronegativity value of calcium is 1.00.

Disclaimer: Please consult a physician before making any changes to your health regimen.

What is the best quiz for you business?

Quizzes are super effective for lead generation and selling products. Find the best quiz for your business by answering a few questions.

Take the quiz