Potassium Trivia Questions and Answers

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1: What is the atomic number of potassium?
A: 17
B: 18
C: 19
D: 20
Correct Answer: C
Explanation: Potassium has an atomic number of 19, which means it has 19 protons in its nucleus.

2: Potassium was first isolated in which year?
A: 1820
B: 1807
C: 1830
D: 1795
Correct Answer: B
Explanation: Potassium was first isolated by Humphry Davy in 1807.

3: What color does potassium emit during a flame test?
A: Red
B: Green
C: Blue
D: Lilac
Correct Answer: D
Explanation: During a flame test, potassium emits a lilac color due to its unique atomic emission spectrum.

4: Potassium is most similar chemically to which element?
A: Sodium
B: Magnesium
C: Calcium
D: Iron
Correct Answer: A
Explanation: Potassium is chemically very similar to sodium, the previous element in group 1 of the periodic table.

5: What is the main natural occurrence form of potassium in the Earth’s crust?
A: Free metal
B: Ionic salts
C: Elemental form
D: Gaseous form
Correct Answer: B
Explanation: In nature, potassium occurs only in ionic salts, not in its elemental or gaseous forms.

6: Potassium has how many isotopes that occur naturally?
A: 1
B: 2
C: 3
D: 4
Correct Answer: C
Explanation: Naturally occurring potassium is composed of three isotopes.

7: Elemental potassium is known to react vigorously with what substance?
A: Nitrogen
B: Water
C: Helium
D: Sand
Correct Answer: B
Explanation: Elemental potassium reacts vigorously with water, producing potassium hydroxide and hydrogen gas.

8: Potassium is a member of which group on the periodic table?
A: Alkaline earth metals
B: Halogens
C: Noble gases
D: Alkali metals
Correct Answer: D
Explanation: Potassium belongs to group 1, the alkali metals in the periodic table.

9: What symbol is used to represent potassium on the periodic table?
A: P
B: Po
C: K
D: Pt
Correct Answer: C
Explanation: The symbol K represents potassium, derived from the Neo-Latin word “kalium.”

10: What is potassium’s melting point in Celsius?
A: 100°C
B: 63.5°C
C: 80°C
D: 90°C
Correct Answer: B
Explanation: Potassium has a melting point of 63.5°C, making it a relatively low-melting metal.

11: What crystal structure does potassium exhibit?
A: Face-centered cubic (fcc)
B: Hexagonal close-packed (hcp)
C: Simple cubic (sc)
D: Body-centered cubic (bcc)
Correct Answer: D
Explanation: Potassium exhibits a body-centered cubic (bcc) crystal structure.

12: Which element is directly above potassium in the periodic table?
A: Sodium (Na)
B: Lithium (Li)
C: Hydrogen (H)
D: Magnesium (Mg)
Correct Answer: A
Explanation: Sodium (Na) is directly above potassium (K) in the periodic table.

13: Potassium ions are crucial for the function of which bodily system?
A: Digestive system
B: Nervous system
C: Respiratory system
D: Integumentary system
Correct Answer: B
Explanation: Potassium ions are vital for the functioning of all living cells, particularly in nerve transmission.

14: What is the common dietary recommendation for potassium intake for adults?
A: 1,000 mg
B: 2,500 mg
C: 3,400 mg
D: 4,000 mg
Correct Answer: C
Explanation: For adult males, the recommended daily intake is around 3,400 mg of potassium.

15: What gas is produced when potassium reacts with water?
A: Oxygen
B: Carbon dioxide
C: Nitrogen
D: Hydrogen
Correct Answer: D
Explanation: When potassium reacts with water, it produces hydrogen gas, which can ignite.

16: Potassium is most commonly extracted from which type of deposits?
A: Igneous rocks
B: Evaporite deposits
C: Sedimentary rocks
D: Metamorphic rocks
Correct Answer: B
Explanation: Potassium salts are typically extracted from extensive evaporite deposits in ancient lake bottoms and seabeds.

17: The human body contains approximately how many grams of potassium per kilogram?
A: 0.2 g
B: 1.0 g
C: 2.0 g
D: 3.0 g
Correct Answer: B
Explanation: The human body contains approximately 1.0 g of potassium per kilogram of body weight.

18: Which mineral is the primary source of potassium for agricultural fertilizers?
A: Calcite
B: Sylvite
C: Quartz
D: Hematite
Correct Answer: B
Explanation: Sylvite (potassium chloride) is the primary source of potassium for agricultural fertilizers.

19: What term describes potassium’s role in the diet for blood pressure regulation?
A: Mineral ionization
B: Ionic balance
C: Nutrient cycling
D: Electrolyte regulation
Correct Answer: D
Explanation: Potassium plays a key role in electrolyte regulation, which impacts blood pressure control.

20: What is a common condition caused by potassium deficiency?
A: Hypertension
B: Diarrhea
C: Hypokalemia
D: Jaundice
Correct Answer: C
Explanation: Hypokalemia is a condition caused by potassium deficiency and can result in muscle weakness and cardiac issues.

21: The main industrial use for potassium is in the production of what compound?
A: Potassium sulfate
B: Potassium nitrate
C: Potassium chloride
D: Potassium cyanide
Correct Answer: C
Explanation: Potassium chloride is the main product of industrial potassium production, primarily used in fertilizers.

22: Potassium naturally forms how many types of oxides?
A: 1
B: 2
C: 3
D: 4
Correct Answer: D
Explanation: Potassium forms four well-studied oxides: potassium oxide, peroxide, superoxide, and ozonide.

23: The decay of which potassium isotope is used to date rocks?
A: 39K
B: 40K
C: 41K
D: 42K
Correct Answer: B
Explanation: The decay of 40K to 40Ar is the basis of a common method for dating rocks.

24: Potassium’s reactivity demands it to be stored in what type of environment?
A: Under water
B: In a dry inert gas atmosphere
C: Exposed to air
D: In a vacuum chamber
Correct Answer: B
Explanation: Due to its high reactivity, potassium is usually stored under anhydrous mineral oil or in a dry inert gas atmosphere to prevent oxidation.

25: What is the critical point of potassium defined by temperature (K) and pressure (MPa)?
A: 2223 K, 16 MPa
B: 2000 K, 10 MPa
C: 2500 K, 20 MPa
D: 2200 K, 18 MPa
Correct Answer: A
Explanation: The critical point of potassium is at 2223 K and 16 MPa.

26: Which compound is a strong base and is very hydrophilic?
A: Potassium nitrate (KNO3)
B: Potassium chlorate (KClO3)
C: Potassium hydroxide (KOH)
D: Potassium carbonate (K2CO3)
Correct Answer: C
Explanation: Potassium hydroxide (KOH) is a strong base and very hydrophilic, readily dissolving in water.

27: How does potassium compare in density to other metals?
A: It is denser than iron.
B: It is the least dense metal.
C: It is the second least dense metal.
D: It has medium density.
Correct Answer: C
Explanation: Potassium is the second least dense metal after lithium.

28: What was the ancient source of extracting potassium called?
A: Salt beds
B: Potash
C: Brine pools
D: Mineral ores
Correct Answer: B
Explanation: Potassium was originally extracted from potash, which involves placing plant ashes in water and then evaporating the solution.

29: Which vegetable is known for being a good dietary source of potassium?
A: Carrots
B: Tomatoes
C: Spinach
D: Potatoes
Correct Answer: D
Explanation: Potatoes are known for being a rich dietary source of potassium.

30: What is the electron configuration of a neutral potassium atom?
A: [Ar] 3s1
B: [Ne] 3s2 3p6 4s2
C: [Ar] 4s1
D: [Kr] 5s1
Correct Answer: C
Explanation: The electron configuration for a neutral potassium atom is [Ar] 4s1.

31: The English name “potassium” derives from which term?
A: Kali
B: Natrium
C: Potash
D: Alkaline
Correct Answer: C
Explanation: The English name for potassium comes from the word “potash.”

32: Potassium’s role in the human body involves maintaining which type of balance?
A: Nitrogen balance
B: Power balance
C: Electrolyte balance
D: Thermal balance
Correct Answer: C
Explanation: Potassium helps maintain electrical balance in the human body’s cells, especially for nerve transmission.

33: Potassium is often combined with which element to make a common industrial alloy?
A: Sodium
B: Magnesium
C: Calcium
D: Aluminum
Correct Answer: A
Explanation: Potassium can be combined with sodium to form the NaK alloy, used in some heat-transfer applications.

34: What is the standard atomic weight of potassium?
A: 39.098 g/mol
B: 40.098 g/mol
C: 41.098 g/mol
D: 38.098 g/mol
Correct Answer: A
Explanation: The standard atomic weight of potassium is 39.098 g/mol.

35: What is the primary method of commercial potassium extraction?
A: Electrolysis
B: Magnetic separation
C: Fractional precipitation
D: Distillation
Correct Answer: C
Explanation: Fractional precipitation, based on solubility differences, is the main method of separating potassium salts commercially.

36: Fresh fruits and vegetables are good dietary sources of potassium. Which of the following has the highest potassium content?
A: Bananas
B: Oranges
C: Apples
D: Blueberries
Correct Answer: A
Explanation: Among these options, bananas are particularly known for their high potassium content.

37: In what form does potassium best conduct electricity?
A: Solid form
B: Liquid form
C: Gaseous form
D: Plasma form
Correct Answer: B
Explanation: Potassium conducts electricity well when it is in liquid form, often as part of an alloy with sodium.

38: During electrolysis, what compound of potassium was used by Humphry Davy to isolate the element?
A: Potassium nitrate (KNO3)
B: Potassium bromide (KBr)
C: Potassium hydroxide (KOH)
D: Potassium sulfate (K2SO4)
Correct Answer: C
Explanation: Humphry Davy isolated potassium by electrolyzing molten potassium hydroxide (KOH).

39: Potassium plays a crucial role in what type of cellular function in humans?
A: Protein synthesis
B: Nerve transmission
C: Immune response
D: DNA replication
Correct Answer: B
Explanation: Potassium ions are essential for nerve transmission across cell membranes.

40: What is the valence electron configuration of potassium?
A: 4s1
B: 3s1
C: 2p6
D: 3p6 4s1
Correct Answer: A
Explanation: Potassium has a single valence electron in the 4s orbital.

41: What is the oxidation state of potassium in most of its compounds?
A: +2
B: 0
C: -1
D: +1
Correct Answer: D
Explanation: Potassium most commonly exhibits an oxidation state of +1 in its compounds.

42: Which property of potassium makes it highly reactive with water?
A: Low melting point
B: Alkali metal nature
C: Paramagnetism
D: High density
Correct Answer: B
Explanation: Being an alkali metal, potassium is highly reactive with water due to its tendency to lose its single valence electron.

43: Potassium ions help regulate what important function in the human heart?
A: Heart twisting
B: Heart rhythm
C: Heart rigidity
D: Heart temperature
Correct Answer: B
Explanation: Potassium ions are essential for maintaining the proper rhythm of the heart.

44: Potassium-argon dating is used primarily for dating what type of materials?
A: Organic samples
B: Igneous rocks
C: Ice cores
D: Soil samples
Correct Answer: B
Explanation: Potassium-argon dating is commonly used to date igneous rocks.

45: What kind of crystal structure does potassium form?
A: Face-centered cubic
B: Hexagonal
C: Body-centered cubic
D: Orthorhombic
Correct Answer: C
Explanation: Potassium forms a body-centered cubic crystal structure.

46: Potassium-deficient soils can be revitalized by adding what substance?
A: Rock salt
B: Synthetic polymers
C: Agricultural fertilizers
D: Sand
Correct Answer: C
Explanation: Agricultural fertilizers containing potassium can remedy potassium-deficient soils.

47: What is the boiling point of potassium in Celsius?
A: 757.643°C
B: 600.000°C
C: 500.000°C
D: 800.000°C
Correct Answer: A
Explanation: Potassium has a boiling point of 757.643°C.

48: Who suggested that potassium and sodium were distinct elements in 1702?
A: Antoine Lavoisier
B: Justus Liebig
C: Georg Ernst Stahl
D: Henri Louis Duhamel du Monceau
Correct Answer: C
Explanation: Georg Ernst Stahl first suggested that potassium and sodium were distinct elements.

49: What is the color of potassium metal when freshly cut?
A: Gold
B: Silvery white
C: Blue
D: Black
Correct Answer: B
Explanation: Freshly cut potassium metal appears silvery white.

50: What type of potassium oxide forms orangish solids and has absorbing properties?
A: Potassium oxide
B: Potassium peroxide
C: Potassium superoxide
D: Potassium ozonide
Correct Answer: C
Explanation: Potassium superoxide (KO2) forms orangish solids and is used in breathing apparatuses due to its oxygen-generating properties.

51: Which food group is typically the richest source of potassium?
A: Dairy products
B: Fresh fruits and vegetables
C: Processed snacks
D: Meat and poultry
Correct Answer: B
Explanation: Fresh fruits and vegetables are the richest sources of dietary potassium.

52: Potassium’s chemical behavior is closely related to which periodic property?
A: Atomic radius
B: Ionization energy
C: Electron affinity
D: Van der Waals radius
Correct Answer: B
Explanation: Potassium’s chemical behavior is closely related to its low ionization energy.

53: In which biological process is potassium prominently involved?
A: Photosynthesis
B: Nerve transmission
C: Blood clotting
D: Detoxification
Correct Answer: B
Explanation: Potassium ions are critical in the biological process of nerve transmission.

54: What is the most common oxidation state of potassium in its compounds?
A: -1
B: +1
C: +2
D: 0
Correct Answer: B
Explanation: The most common oxidation state of potassium in its compounds is +1.

55: Potassium has historically been used to produce what type of soap?
A: Soft soap
B: Hard soap
C: Liquid soap
D: Glycerin soap
Correct Answer: A
Explanation: Potassium has been used to produce soft soaps, which are more water-soluble.

56: Which type of reaction releases sufficient heat to ignite hydrogen when potassium reacts?
A: Endothermic reaction
B: Exothermic reaction
C: Neutral reaction
D: Catalytic reaction
Correct Answer: B
Explanation: The reaction of potassium with water is exothermic, releasing enough heat to ignite the hydrogen produced.

57: What does the Na⁺/K⁺-ATPase pump accomplish in cells?
A: Creates energy
B: Transports oxygen
C: Balances electrolytes
D: Produces enzymes
Correct Answer: C
Explanation: The Na⁺/K⁺-ATPase pump maintains electrolyte balance and creates an electrochemical gradient in cells.

58: Potassium chloride is primarily used in which agricultural application?
A: Fertilizer
B: Pesticide
C: Insecticide
D: Herbicide
Correct Answer: A
Explanation: Potassium chloride is widely used as a fertilizer in agriculture.

59: What compound results from potassium reacting with carbon dioxide?
A: Potassium sulfate
B: Potassium permanganate
C: Potassium nitrate
D: Potassium carbonate
Correct Answer: D
Explanation: When potassium reacts with carbon dioxide, it forms potassium carbonate (K2CO3).

60: Which of the following is a primary symptom of potassium deficiency?
A: Jaundice
B: Muscular weakness
C: Cough
D: Blurred vision
Correct Answer: B
Explanation: Muscular weakness is a primary symptom of potassium deficiency (hypokalemia).

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

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