Red short iron cracks when bent due to the presence of A. Sulphur B. Carbon C. Phosphorus D. Silicon

The correct answer is A. Sulphur.

Red short iron is a type of iron that is brittle and prone to cracking when bent. It is caused by the presence of sulphur in the iron. Sulphur forms iron sulphide inclusions,

which are brittle and weak. When the iron is bent, these inclusions can cause the iron to crack.

Carbon, phosphorus, and silicon are also elements that can be found in iron. However, they do not cause

red short iron. Carbon is an essential element in steel, and it does not cause brittleness. Phosphorus can cause brittleness, but it is not the main cause of red short iron. Silicon can also cause brittleness, but it is not as common as sulphur.

Sulphur is the main cause of red short iron. It is important to remove sulphur from iron to prevent red short iron from forming. This can be done by adding a desulfurizing agent to the iron during the smelting process.