CBSE Class 10 Science 2020 · Paper 31/4/2 · Question 25
Define an alloy. How is an alloy prepared ? List two advantages of making alloys. Write the composition of stainless steel. Why is steel preferred over iron ? List two reasons.
Answer
An alloy is a homogeneous mixture of metals, or a metal and a non-metal; steel is preferred because it is harder than iron.
An alloy is a homogeneous mixture of two or more metals, or of a metal and a non-metal. It is prepared by melting the primary metal, dissolving the other elements in it in definite proportions and cooling to room temperature. Advantages: alloys are harder and stronger than the pure metal and resist corrosion better (other correct advantages, such as a lower melting point, also earn credit). Stainless steel is iron with chromium and nickel. Steel is preferred over iron because it is hard (pure iron is soft) and stainless steel does not rust (iron rusts easily).
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