Question

Which of the following is a ferrous alloy?
A. Solder
B. Brass
C. Magnalium
D. Steel

Answer 1

Any metal made by the combination of two or more metallic elements is known as an alloy. The alloys that contain iron in greater proportions are known as ferrous alloys.

Complete step by step answer:
Solder alloy is made up of tin and lead metals. Solder alloy is fusible and has a melting point of ${90^ \circ }{\text{C}}$ to ${450^ \circ }{\text{C}}$. Solder alloy does not consist of iron. Thus, solder alloy is not a ferrous alloy.
Brass alloy is made up of copper and zinc metals. The proportions of the copper and zinc are varied to alter the mechanical and electrical properties. Brass alloy does not contain iron. Thus, brass alloy is not a ferrous alloy.
Magnalium alloy is made up of magnesium and aluminium metals. Magnalium alloy contains $5\%$ magnesium and $95\%$ aluminium. Magnalium alloy does not contain iron. Thus, magnalium alloy is not a ferrous alloy.
Steel alloy is made up of iron, carbon, manganese and small amounts of silicon, phosphorus, sulphur and oxygen. It contains $2\%$ of carbon, $1\%$ of manganese. The steel alloy mostly contains iron. Steel contains approximately more than $95\%$ of iron. Thus, steel alloy is a ferrous alloy.

So, the correct answer is “Option D”.

Note:
Steel is widely used in everyday life for the construction of roads, railways, buildings, etc. the maintenance of steel is easier. Steel is resistant to moulds and mildews. Steel also resists natural disasters like earthquakes, hurricanes, etc. Steel is harder and stronger than pure iron. The most important advantage of steel over iron is that steel does not rust as iron does.