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Quiz about The Odd One Out Chemistry Style

The Odd One Out: Chemistry Style Quiz

Chemical compounds differ in their structure, physical properties (like colour) and chemical properties (the way they react). You have to identify the chemical that doesn't have the same properties as the other three!

A multiple-choice quiz by mchem. Estimated time: 4 mins.

Author
mchem

Time
4 mins

Type
Multiple Choice

Quiz #
316,470

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
5 / 10

Plays
1046

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Which of these is the odd one out? (Think chemical composition) Hint

Dry ice

Iodine

Sulfuric acid

Water

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Question 2 of 10

2. Which of these binary (two-element) compounds consisting of hydrogen and another element is different than the rest in its chemical properties? (Clue: pH value) Hint

Hydrogen chloride

Ammonia

Hydrogen fluoride

Hydrogen sulphide

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Question 3 of 10

3. Which of these organic compounds is in a different class than the rest? Hint

Benzene

Propene

Ethene

Pentene

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Question 4 of 10

4. Which is the odd one out? (Hint: Names) Hint

Toluene

2-Phenylpropane

Cumene

Isopropylbenzene

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Question 5 of 10

5. Which of these isn't like the rest? (Note: Actually, you shouldn't taste chemicals!) Hint

Lead(II) acetate

Sucrose

Magnesium sulphate

Glycerol

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Question 6 of 10

6. You should really be careful with some chemicals! Which of these in not as dangerous as the rest? (Hint: Ka-Boom!!!) Hint

Methylamine

Glyceril trinitrate

Trinitrotoluene

Octanitrocubane

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Question 7 of 10

7. Which compound differs from the rest? (Clue: Chemistry can be really pretty!) Hint

Sulphuric acid

Beta-Carotene

Fluorescein

Chlorophyll

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Question 8 of 10

8. Find the odd one out! (Clue: Solubility) Hint

Acetic acid

Tristearin

Ethanol

Sodium chloride

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Question 9 of 10

9. Which of these doesn't react like the rest? (Clue: Oxygen is also one!) Hint

Chlorine

Potassium permanganate

Hydrogen

Nitric acid

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Question 10 of 10

10. Which differs from the rest? (Hint: s, l or g?) Hint

Dihydrogen monoxide

Dinitrogen monoxide

Carbon dioxide

Sulphur dioxide

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Quiz Answer Key and Fun Facts

1. Which of these is the odd one out? (Think chemical composition)

Answer: Iodine

All the others consist of more than one chemical element! Dry ice is the solid state of carbon dioxide (CO2).

2. Which of these binary (two-element) compounds consisting of hydrogen and another element is different than the rest in its chemical properties? (Clue: pH value)

Answer: Ammonia

The aqueous solutions of the three wrong answers are acidic (pH value below 7), whereas aqueous ammonia is basic (pH above 7).

3. Which of these organic compounds is in a different class than the rest?

Answer: Benzene

In spite of its name ending in -ene, benzene is not an alkene (a compound with a double carbon-carbon bond), but rather an aromatic compound consisting of a 6-membered aromatic ring.

4. Which is the odd one out? (Hint: Names)

Answer: Toluene

All the other answers describe the same compound - C6H5CH(CH3)2. Toluene is also known as methylbenzene or, less commonly, phenylmethane and has the chemical formula C6H5CH3.

5. Which of these isn't like the rest? (Note: Actually, you shouldn't taste chemicals!)

Answer: Magnesium sulphate

While MgSO4, also known as Epsom salt, tastes bitter, the other three choices taste sweet. But careful - lead compounds are toxic! Apparently, ancient Romans used Pb(CH3COO)2 to sweeten their wine! Definitely not healthy...

6. You should really be careful with some chemicals! Which of these in not as dangerous as the rest? (Hint: Ka-Boom!!!)

Answer: Methylamine

The wrong choices are all explosives - some more commonly known, like trinitrotoluene (TNT) and glyceryl trinitrate (Nitroglycerine), others - like octanitrocubane - recently synthesised. Methylamine, while highly flammable, is not a high explosive. It is used as an intermediate product in organic chemistry.

7. Which compound differs from the rest? (Clue: Chemistry can be really pretty!)

Answer: Sulphuric acid

Even though some films, especially cartoons, tend to depict acids as neon green, your typical acid is colourless! The wrong answers are all organic dyes. Beta-carotene gives carrots their colour, chlorophyll is the green in plant leaves. Fluorescein is a synthetic compound which, as the name suggests, is a fluorescent dye.

8. Find the odd one out! (Clue: Solubility)

Answer: Tristearin

You can try this one out in the kitchen! Tristearin (a type of saturated fat) doesn't dissolve in water. Ethanol (the alcohol found in beverages - bet you knew this one!), acetic acid (the acid in vinegar) and NaCl (table salt) are all water soluble.

9. Which of these doesn't react like the rest? (Clue: Oxygen is also one!)

Answer: Hydrogen

Hydrogen is the only reducing agent among the four - the rest are all oxidizing agents.

10. Which differs from the rest? (Hint: s, l or g?)

Answer: Dihydrogen monoxide

The symbols s, l and g are used to denote solid, liquid and gaseous state. Dihydrogen monoxide is a fancy name for plain water! Under standard pressure at room temperature water is liquid, the other three oxides are gasses.
The scientific name of water was used to create a joke website about the dangers of "DHMO" (www.dhmo.org) - really funny when you know what they're talking about! Speaking of fun, N2O is known as "laughing gas". As for dangerous, CO2 (a greenhouse gas) and SO2 (responsible for acid rain) are far more dangerous than DHMO!

Source: Author mchem

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