Which of the following statement is incorrectly matched?

Question

Accepted Answer

Option 1 is correctly identified as the incorrect match. Here's why:

1. **A metal used in joining electric wires - Magnesium**: This statement is incorrectly matched. Magnesium is not typically used for joining electric wires. Instead, metals like tin and lead are commonly used in soldering, which is the process of joining electrical wires. Solder is an alloy, often composed of tin and lead, that melts at a low temperature and is used to create a conductive bond between wires. Magnesium, on the other hand, is not suitable for this purpose due to its high reactivity and flammability.

2. **A metal whose oxide is soluble in both acids and bases - Zinc**: This statement is correctly matched. Zinc oxide is amphoteric, meaning it can react with both acids and bases. When zinc oxide reacts with an acid, it forms a zinc salt and water. Similarly, when it reacts with a base, it forms a zincate compound. This dual solubility characteristic is a defining property of amphoteric oxides.

3. **A metal unreactive towards oxygen and dilute acids - Gold**: This statement is correctly matched. Gold is known for its lack of reactivity, which is why it does not tarnish or corrode easily. It does not react with oxygen under normal conditions and is also resistant to attack by most acids, including dilute acids. This inertness is one of the reasons gold is highly valued for use in jewelry and electronics.

4. **A metal extracted by using electrolytic reduction - Aluminium**: This statement is correctly matched. Aluminium is extracted from its ore, bauxite, through the process of electrolytic reduction. This involves dissolving alumina (aluminium oxide) in molten cryolite and then using electrolysis to separate the aluminium metal. This method is known as the Hall-Héroult process and is the primary method of aluminium production.

In summary, Option 1 is the incorrect match because magnesium is not used for joining electric wires, whereas the other options correctly describe the properties and uses of zinc, gold, and aluminium.