Class 10 Science: Chemical Reactions and Equations

Which of the following statements about the given reaction are correct? 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as a reducing agent. (iv) Water is acting as an oxidising agent.

In a double displacement reaction, which of the following is typically observed?

The process of respiration is a type of ____ reaction.

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed and sulphuric acid is produced. The reaction is an example of a:

Why is it important to balance chemical equations?

Which of the following is an example of a decomposition reaction?

The addition of oxygen to a substance is called ____, while the removal of oxygen is called ____.

Distinguish between an endothermic and an exothermic reaction.

Rusting of iron is a common example of ____.

A student added dilute HCl to a test tube containing zinc granules. Which of the following observations is incorrect?