Question

Mark the correct reason why tungsten is used for making filament of electric lamps.
A. Tungsten oxidizes easily
B. It has a low boiling point
C. It has a high melting point
D. None

Answer 1

Hint: In order to solve this problem you need to know that Tungsten is widely used in heavy metal alloys such as high-speed steel from which cutting tools are made. It is also used for the production of wear-resistant coatings in so-called 'superalloys.' This ensures that tungsten is not easily lost. Knowing these properties of tungsten will solve your dilemma and give you the right answer.

complete answer
We need to know that Tungsten It is a rare metal occurring naturally on Earth, almost exclusively mixed with other elements in chemical compounds, rather than alone. Its important minerals include wolframite and scheelite.
Tungsten is used in an electrical bulb because it has a high melting point and does not oxidize. Thus, the filament of tungsten does not melt even though a large amount of heat is generated due to the passage of the current through the filament (through the heating effect of the current).
So, the correct option from the above information is C that tungsten has a high melting point.

Note: When you get to solve such problems you need to recall the properties of some of the metal which plays a pivotal role in various applications in the industries. Some of the properties of tungsten are: Tungsten is a grayish-white lustrous metal that is solid at room temperature. Tungsten has the highest melting point and the lowest vapor pressure of all metals and the highest tensile strength at temperatures above 1650$^\circ$C. It has excellent corrosion resistance and is only marginally influenced by most mineral acids. Knowing these things will help you further.