The correct option is
A-2, B-3, C-1, D-4
Explanation
The physical and chemical properties of specific metals used in surface coating and electroplating. These metals are selected based on characteristics such as reactivity, corrosion resistance, and aesthetic appeal.
Statement-wise Analysis:
- A. Chromium (Matches 2): Chromium has a shiny appearance and is highly scratch-resistant. It does not corrode easily. For these reasons, it is widely used in electroplating objects like car parts, bath taps, and bicycle handlebars.
- B. Tin (Matches 3): Tin is less reactive than iron. It is used to coat iron containers (tin cans) for storing food. This coating prevents food from coming into direct contact with iron, thereby protecting it from spoilage.
- C. Zinc (Matches 1): Zinc is used to coat iron in a process known as galvanization. Zinc is more reactive than iron; it oxidizes in preference to iron, providing sacrificial protection that protects iron from rust.
- D. Gold (Matches 4): Gold is a noble metal with a distinct yellow lustre. It is used in jewelry making and plating to provide the appearance of expensive metal due to its resistance to tarnish and high aesthetic value.
Key Takeaway:
Metals are chosen for coating based on specific functional properties: Chromium for hardness and shine, Tin for low reactivity with food, Zinc for rust protection (galvanization), and Gold for decoration.