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Alloy

An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, made to improve useful properties.

In one line: Alloy means useful mix.

Understand it

Alloys are prepared because pure metals are often too soft, too reactive, or not strong enough for practical use. Mixing elements changes hardness, strength, corrosion resistance, and sometimes melting point. Common examples are brass, bronze, and stainless steel.

Example

Brass is a mixture of copper and zinc.

Rule to remember

Rule: an alloy is a mixture, not a compound, and it is formed to obtain better properties than the pure metal.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

Pure copper is soft, but brass made from copper and zinc is harder and more suitable for fittings and decorative items.

Method you can reuse

1Identify the base metal and added element.
2Decide whether the answer asks for meaning, example, or use.
3State the improved property.
4Remember that an alloy is a mixture.

Visual tip

A simple comparison table showing pure metal versus alloy properties is enough for quick revision.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

Why are alloys like brass and stainless steel made instead of using only pure metals?

Think first, then show answer

Alloys are made to improve properties such as hardness, strength, and resistance to corrosion, so they are more useful than many pure metals.

Common wrong answer

A common wrong answer is to call an alloy a compound, but alloys do not have a fixed chemical formula like compounds.

Don't mix this up

Students often think an alloy is a compound, but it is usually a mixture with variable composition.

Exam tip

In exams, mention that alloys are mixtures made to improve properties.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Exam questions may ask for the meaning of an alloy, examples of alloys, or why an alloy is preferred over a pure metal.

1
Enough for 1 mark
An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, made to improve useful properties.
2
Add for 2 marks
Example: Brass is a mixture of copper and zinc.
3
Add for 3 marks
Alloys are prepared because pure metals are often too soft, too reactive, or not strong enough for practical use.

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