- What happens when an iron nail is dipped in copper sulphate solution?
- Explain the oxidation in terms of gain or loss of oxygen with examples.
- Explain the terms oxidizing and reducing agents.
- Oil and fat containing food items are flushed with Nitrogen. Why?
- Why do we apply paint on iron articles?
- What do you understand by corrosion?
- Define oxidizing agent.
- Identify the component oxidized in the following reaction : H2S + Cl2 → S + 2HCl
- Which of the following is a combination and which is a displacement reaction?
(a) Cl2 + 2KI → 2KCl + I2
(b) 2K + Cl2 → 2KCl
- A solution of a substance ‘X’ is used for white washing. (a) Name the substance ‘X’ and write its formula.(b) Write the reaction of the substance ‘X’ named in (a) above with water.
- What is the difference between displacement and double displacement reactions? Write example of each reaction.
- Why should magnesium ribbon be cleaned before burning in air?
- Explain the oxidation in terms of gain or loss of oxygen with examples.
- What do you understand by corrosion?
- What is a chemical reaction?
- Define rancidity.
- What is meant by oxidation?
- What are displacement reactions?
- What is catalytic decomposition?
- What do you understand by a balanced chemical equation? Why should the chemical equation be Balanced?
(a) Sodium + Water Sodium hydroxide + Hydrogen
(b)
Barium Chloride + Aluminium Sulphate Barium Sulphate + Aluminium Chloride
(c) Hydrogen sulphide + Oxygen Water + Sulphur dioxide
- Why respiration is considered an exothermic reaction? Explain.
- What is the difference between combination and decomposition reaction? Give one example of each type.
- What type of reaction is represented by the digestion of food in our body?
- Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
- What are double displacement reactions? Give an example.