Redox Reactions quiz

More questions about Redox Reactions

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which gemstone can burn in a blowtorch flame?

   Answer: Diamond

   Why: A flawless diamond burns away completely into carbon dioxide gas, leaving ash behind only from its impurities.

2. 2 Medium

   What fills the oxygen-absorber packets found in food bags?

   Answer: Iron powder

   Why: Moisture switches the iron on, and as it rusts it can pull the oxygen in a sealed pack below 0.01%.

3. 3 Hard

   What is oxygen's oxidation number in OF₂?

   Answer: +2

   Why: Fluorine is even more electronegative than oxygen, so in OF₂ it pulls the shared electrons away and leaves oxygen positive.

4. 4 Easy

   Which role does oxygen play in a fire?

   Answer: Oxidizer

   Why: Oxygen does not burn, but extra oxygen makes ordinary materials catch fire more easily and burn faster and hotter.

5. 5 Medium

   What is the reactant that gets oxidized called?

   Answer: Reducing agent

   Why: A reducing agent is named for what it does to its partner: by giving away its own electrons, it reduces the other reactant.

6. 6 Hard

   Which element was first found in a +9 oxidation state?

   Answer: Iridium

   Why: Until 2014 the ceiling was +8, held by elements such as osmium in osmium tetroxide.