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Chemistry for Geniuses Trivia Quiz

If you think you are good at chemistry then try this quiz.

A multiple-choice quiz by Sohaib. Estimated time: 5 mins.

Author
Sohaib

Time
5 mins

Type
Multiple Choice

Quiz #
177,246

Updated
Jun 04 24

# Qns
10

Difficulty
Difficult

Avg Score
5 / 10

Plays
2985

One at a Time - Single Page - Timed Game

Question 1 of 10

1. The purity of an ester can be checked from which of its properties before being used as a food flavouring? Hint

solubility in water

colour

boiling point

density

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Question 2 of 10

2. Three of these substances have a macromolecular structure. Which is the odd one out? Hint

sodium chloride

graphite

diamond

silicon dioxide

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Question 3 of 10

3. One of these atoms has the same electronic configuration as the strontium ion. Which one? Hint

krypton

rubidium

calcium

helium

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Question 4 of 10

4. If an 8g sample of oxygen has the same number of atoms as 16g of element X, which of these is the relative atomic mass of X? Hint

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Question 5 of 10

5. In the right conditions, hydrochloric acid can react with each of the listed substances. Which reaction gives a colourless solution only? Hint

potassium hydroxide

iron(II) hydroxide

calcium carbonate

silver nitrate

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Question 6 of 10

6. After acidification with dilute nitric acid, a colourless solution of which substance reacts with aqueous silver nitrate to give a white precipitate? Hint

calcium iodide

silver chloride

copper (II) chloride

lead (II) iodide

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Question 7 of 10

7. Which of these gases is used to speed up the ripening of fruit? Hint

ethylene

carbon dioxide

oxygen

hydrogen

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Question 8 of 10

8. Which metal is the most malleable? Hint

aluminium

zinc

gold

carbon

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Question 9 of 10

9. Using which of these is the best way to distinguish between ethane and ethene? Hint

litmus solution

a lighted splint

aqueous bromine

limewater

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Question 10 of 10

10. The manufacture of plastics is causing a reduction in which of these natural resources? Hint

fossil fuels

water

air

metal ores

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Quiz Answer Key and Fun Facts

1. The purity of an ester can be checked from which of its properties before being used as a food flavouring?

Answer: boiling point

A pure compound has a fixed boiling point at a fixed pressure. An impure ester would have a range of boiling points.

2. Three of these substances have a macromolecular structure. Which is the odd one out?

Answer: sodium chloride

Sodium chloride has a giant ionic structure consisting of a lattice of positive and negative ions. These are held in position by strong electrostatic forces of attraction.

3. One of these atoms has the same electronic configuration as the strontium ion. Which one?

Answer: krypton

Both Sr(2+) (strontium) and Kr (krypton) have the same number of electrons (36) and therefore should have the same electronic configuration.

4. If an 8g sample of oxygen has the same number of atoms as 16g of element X, which of these is the relative atomic mass of X?

Answer: 32

The calculation is as follows:

The number of moles of oxygen is 8/32 simplified to 0.25
The number of atoms in the oxygen sample is 2(0.25) equal to 0.5

Since the number of moles of oxygen atoms is the same as the number of moles of X atoms:

The number of moles of X atoms => 0.5 = 16/relative atomic mass, so the
relative atomic mass = 16/0.5 = 32

5. In the right conditions, hydrochloric acid can react with each of the listed substances. Which reaction gives a colourless solution only?

Answer: potassium hydroxide

Potassium hydroxide is neutralized by the acid to form a colourlesspotassium chloride solution.

6. After acidification with dilute nitric acid, a colourless solution of which substance reacts with aqueous silver nitrate to give a white precipitate?

Answer: silver chloride

As it is a colourless solution, it does not contain transition metal ions. The white precipitate is likely to be silver chloride.

7. Which of these gases is used to speed up the ripening of fruit?

Answer: ethylene

The gas is created naturally by fruits as they ripen and producers can hurry up the process by artificial means. Placing unripe fruit in a paper bag at home will have the same effect.

8. Which metal is the most malleable?

Answer: gold

Gold can be hammered out very thinly to cover a large area due to its malleability.

9. Using which of these is the best way to distinguish between ethane and ethene?

Answer: aqueous bromine

Ethene is an unsaturated hydrocarbon that will undergo an addition reaction with bromine to form a colourless solution.

10. The manufacture of plastics is causing a reduction in which of these natural resources?

Answer: fossil fuels

The raw materials used to manufacture plastics are derived from petroleum, a fossil fuel.

Source: Author Sohaib

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