class 10

Aarush, Aarav, and Kavya are working on a school project about the role of electrons in chemistry. They are trying to explain this concept through the example of a battery. What conclusion do they reach?

• Electrons form covalent bonds in the battery.

• Electrons transfer energy in the battery.

• Electrons create molecules in the battery.

• Electrons balance oxidation states in the battery.

Kiara, Arnav, and Aisha are working on a school project about car engines. They learned that in the process of combustion, the fuel gains electrons. What is this process called in redox reactions?

• Reduction

• Oxidation

• Increasing oxidation state

• Decreasing oxidation state

Asher, Myra, and Akhil are working on a science project about the chemical reactions. They are discussing the oxidation state of oxygen in water. What do you think is the oxidation state of oxygen in water?

• Positive two

• Negative two

• Zero

• Depends on the compound

Dia, Aashi, and Shreya are working in a lab, studying the properties of water. They are trying to determine the oxidation state of hydrogen in water. What would that be?

• Positive one

• Negative one

• Zero

• Depends on the compound

During a science fair, Aarav and Avani were demonstrating a chemistry experiment where they reacted silver diamine with an aldehyde. In this reaction, Tara, who was observing, asked which species was oxidized. What should be their answer?

• Silver

• Diamine

• Aldehyde

• Hydroxide