Salt Trivia
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50 free Salt trivia questions with answers — science & nature quiz, new questions added Aug 2026.
Salt is the only rock we eat, and it has been worth fighting wars over. This salt trivia quiz covers the chemistry (why it dissolves, why it lowers water's freezing point, why table salt is iodised), the history (Neolithic saltworks in Romania, Roman salt roads, Venice's salt wars, the French gabelle and Gandhi's march to Dandi), and the geography of the great salt places: Hallstatt, Wieliczka, Goderich, Khewra, the Salar de Uyuni and the Dead Sea. There is also room for the words and customs salt gave us (salary, salad, 'salt of the earth', throwing a pinch over your shoulder), the myths that turned out to be false, and the numbers behind the 300 million tonnes produced each year. Questions run from easy to expert, and every answer is verified and cited to its reference page. If you enjoy this quiz, try our other food, science and history quizzes.
30 of 50 questions with answers and explanations. Play the quiz
Q 01What is the chemical formula of common salt?
NaCl
NaCl. Its two ingredients are a soft metal that fizzes violently in water and a poison gas used as a weapon in the First World War, yet bonded together they are safe to sprinkle on dinner.
Q 02What is the mineral name for natural crystalline salt?
Halite
Halite. The name comes from hals, the Greek for salt, and its crystals grow as cubes because the atoms inside stack in a cubic grid, which is why even table-salt grains are tiny boxes.
Q 03Sea-salt evaporation ponds often glow pink, red or green when seen from the air because of what?
Tiny algae and microbes
Tiny algae and microbes. The colour tracks the saltiness: green algae rule the weaker ponds and red, salt-loving microbes the strongest, so the colour shows how far each pond has evaporated.
Q 04Solnitsata, a salt-making town often called Europe's oldest, lies in which modern country?
Bulgaria
Bulgaria. Around 4500 BC its 350 or so people boiled spring brine into salt bricks to trade and ringed the town with stone walls; that wealth may explain the treasure-filled graves found nearby at Varna.
Q 05Roughly how much salt is produced worldwide each year?
300 million tonnes
300 million tonnes. Shared out, that is more than 30 kg a year for every person alive, far more than anyone could eat.
Q 06Most of the world's salt is never eaten, so what is its single biggest use?
Feedstock for chemical production
Feedstock for chemical production. Split by electricity, brine yields chlorine and caustic soda, the starting points for PVC plastic and paper-making; de-icing roads is salt's other giant job.
Q 07The WHO's daily salt limit for adults, 5 grams, is about how much?
A teaspoon
A teaspoon. In 2021 adults worldwide averaged more than twice that, about 11 grams a day, and the chief harm the WHO blames on the excess is raised blood pressure.
Q 08Which Austrian lakeside village has a salt mine billed as the world's oldest?
Hallstatt
Hallstatt. Salt has been dug here for some 7,000 years and made the village so rich in the early Iron Age that a whole era of European prehistory, the Hallstatt culture, is named after its graves.
Q 09Which word for pay comes from the Latin for salt?
Salary
Salary. The Latin salarium clearly contains sal, salt, but nobody knows quite why: the popular story that Roman soldiers were paid in salt has no ancient evidence behind it.
Q 10Which everyday dish takes its name from the Latin for 'salted'?
Salad
Salad. The Romans dressed raw leaves with brine and called the dish herba salata, 'salted greens'; the same Latin root also gave us sauce, salsa, salami and sausage.
Q 11Which city fought Padua in the Salt War of 1304?
Venice
Venice. Padua had started building salt pans of its own on the edge of the lagoon; Venice saw a threat to its salt monopoly, won the brief war and had the monopoly confirmed.
Q 12Which English port flourished on exporting salt from Cheshire's mines?
Liverpool
Liverpool. Salt, coal and cloth went out from the Mersey and sugar and tobacco came back, an exchange that helped turn a small town into one of Britain's great ports.
Q 13Which ruler revived the gabelle, France's hated salt tax, in 1806?
Napoleon
Napoleon. The Revolution had scrapped it, but he needed money for his wars, and it then lingered into the 1940s; under the old kings, households had even been forced to buy a set amount of salt each year.
Q 21A pinch of table salt thrown into a gas flame makes it burn which colour?
Yellow
Yellow. The colour comes from the sodium in the salt, and it is the very same light, at one sharp wavelength, that gives sodium street lamps their orange-yellow glow.
Q 22Salt keeps winter roads clear by lowering which property of water?
Freezing point
Freezing point. The trick has a floor, though: even the strongest brine turns solid at around −20 °C, so in deeper cold road crews switch to other salts such as calcium chloride.
Q 23Iodine is added to table salt mainly to prevent which condition?
Goitre
Goitre. A thyroid starved of iodine swells into a lump in the neck; the deeper cost is to the brain, because iodine deficiency is the world's leading preventable cause of intellectual disability.
Q 14Which leader walked some 240 miles to the sea in 1930 to make salt in defiance of British law?
Mahatma Gandhi
Mahatma Gandhi. He set out with a few dozen followers and hundreds more joined on the way; after he picked up a handful of salt at Dandi, some 60,000 Indians were jailed that year for following his lead.
Q 15In medieval West Africa, salt carried across the Sahara to Timbuktu was most often exchanged for what?
Gold
Gold. South of the desert salt was scarce and gold plentiful, so traders swapped one for the other; in parts of West Africa salt is said to have been worth its weight in gold.
Q 16The 1877 Salt War over salt lakes near Guadalupe Peak was fought around which Texas border city?
El Paso
El Paso. Locals had always gathered the salt freely, so when a judge claimed the lakes for his family they rose in revolt, and a besieged company of Texas Rangers ended up surrendering to them.
Q 17Which general supposedly sowed Carthage with salt in 146 BC, a story now regarded as apocryphal?
Scipio Aemilianus
Scipio Aemilianus. He did raze Carthage in 146 BC and sell the survivors into slavery, but no ancient writer mentions salt; the tale was attached to Carthage many centuries later.
Q 18Which desert people have traditionally run the Azalai salt caravans across the Sahara?
The Tuareg
The Tuareg. Their camel trains hauled slabs of salt from the mines of Taoudenni south to Timbuktu, though most of the salt now makes the journey by truck.
Q 19In which African land were slabs of rock salt used as coins?
Abyssinia
Abyssinia. The blocks, called amole, were cut from the salt plains of the Danakil Depression and passed as money across the Ethiopian highlands; their use is recorded as late as 1911.
Q 20Which fish, salted and dried, is the basis of Portugal's national dish, bacalhau?
Cod
Cod. The fish comes from far-off northern waters such as Newfoundland's Grand Banks, and salting was what let it survive the voyage; Portugal is said to have over a thousand recipes for it.
Q 24Kosher salt takes its name from the Jewish practice of using coarse salt to do what to meat?
Draw out the blood
Draw out the blood. Jewish law forbids eating blood, so meat is salted and left to drain; the salt itself is no more kosher than any other, its big flakes are simply the right size for the job.
Q 25Low-sodium table salts swap part of the sodium for which other element?
Potassium
Potassium. Its chloride tastes salty too, so blends of the two pass for ordinary salt, and WHO guidance suggests households replace regular table salt with them.
Q 26In France and Germany, fluoride is added to table salt to protect what?
Teeth
Teeth. Fluoride hardens tooth enamel against decay; countries that do not fluoridate their tap water, France and Germany among them, sell fluoridated table salt as the alternative.
Q 27Which sea salt is skimmed from the surface of evaporating brine in salt pans?
Fleur de sel
Fleur de sel. The 'flower of salt' is a fragile crust of crystals that floats on the brine and has to be raked off gently by hand; the ordinary sea salt is what sinks to the bottom.
Q 28Which organs keep the salt level of your blood in balance by filtering out the excess?
Kidneys
Kidneys. They filter about half a cup of blood every minute; eat more salt than they can clear and the body holds on to extra water to dilute it, which is what pushes blood pressure up.
Q 29Where does most of the sodium Americans eat come from?
Packaged and restaurant food
Packaged and restaurant food. It supplies over 70% of the sodium Americans eat, and sandwiches, pizza and soup rank among the biggest contributors, not just obviously salty snacks.
Q 30Which country was the world's largest salt producer in 2018?
China
China. It has long practice: centuries ago drillers in Sichuan bored wells up to half a mile deep to reach brine, then burned the natural gas that came up with it to boil the brine into salt.