Question
Question 7 Which of the following statements is/are chemical changes? - LRusting of a nail II. Freezing of water III. Decomposition of water into hydrogen and oxygen gas land land III alone lalone Points 3
Answer
4.4
(313 Votes)
Caleb
Master · Tutor for 5 years
Answer
'I and III'
Explanation
## Step 1To solve this problem, we first need to understand the difference between a chemical change and a physical change. A chemical change involves a substance transforming into one or more different substances, usually characterized by a change in chemical properties. On the other hand, a physical change alters a substance's physical properties without changing its chemical identity.## Step 2Now, let's analyze each of the given statements:1. Rusting of a nail: This is a chemical change. Rusting is a process where iron reacts with oxygen and water to form iron oxide (rust), which is a new substance different from the original iron and oxygen.2. Freezing of water: This is a physical change. Freezing water turns it from liquid to solid state, but the chemical composition of water (H2O) remains unchanged.3. Decomposition of water into hydrogen and oxygen gas: This is a chemical change. Decomposition of water involves breaking down water (H2O) into hydrogen (H2) and oxygen (O2) gases, which are substances different from water.## Step 3Given these explanations, the correct answer should include the scenarios that are chemical changes.#