For the following reasons,
Nichrome wire is generally used as a heating element in heating appliances: (i) Its melting point is high. (ii) Its resistivity is high. (iii) It does get oxidized easily. Choose the correct option:

Question

For the following reasons, 
Nichrome wire is generally used as a heating element in heating appliances: (i) Its melting point is high. (ii) Its resistivity is high. (iii) It does get oxidized easily. Choose the correct option:

Accepted Answer

Option 1 is the correct answer because it accurately identifies the reasons why nichrome wire is generally used as a heating element in heating appliances. Let's examine each statement:

1. **High Melting Point (i):** Nichrome has a high melting point, which is crucial for heating elements. This property ensures that the wire can withstand high temperatures without melting, making it suitable for prolonged use in heating appliances.

2. **High Resistivity (ii):** Nichrome's high resistivity is another key factor. High resistivity means that the wire will generate more heat when an electric current passes through it, which is the primary function of a heating element. This property allows nichrome to efficiently convert electrical energy into heat.

3. **Does Not Get Oxidized Easily (iii):** This statement is incorrect. Nichrome is actually known for its resistance to oxidation and corrosion at high temperatures, which is why it is favored for heating elements. However, the statement in the question suggests that it gets oxidized easily, which is not true.

Now, let's explain why the other options are incorrect:

- **Option 2 (Only (i) and (iii) are correct):** This option is incorrect because statement (iii) is false. Nichrome does not get oxidized easily; it is resistant to oxidation, which is why it is used in heating elements.

- **Option 3 (Only (ii) and (iii) are correct):** This option is incorrect because, as mentioned, statement (iii) is false. Additionally, statement (i) is correct, so excluding it makes this option incorrect.

- **Option 4 (All (i), (ii), and (iii) are incorrect):** This option is incorrect because both statements (i) and (ii) are true. Nichrome's high melting point and high resistivity are valid reasons for its use in heating elements.

In conclusion, Option 1 is the correct answer because it correctly identifies the true statements (i) and (ii) regarding the properties of nichrome that make it suitable for use as a heating element.