Which of the following statements is/are true? a. The rusting of iron can be prevented by making alloys. b. Stainless steel is primarily an alloy of iron, chromium, and nickel. c. An alloy is a heterogenous mixture of two or more metals.
a and b
Statement a: Alloying changes the properties of iron; for example, stainless steel (iron with chromium and nickel) does not rust. So rusting can be prevented by making alloys. True.
Statement b: Stainless steel is mainly iron with chromium (about 18%) and nickel (about 8%) plus a little carbon. True.
Statement c: An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, made by melting them together; its composition is uniform throughout. Calling it heterogeneous is False.
So only statements a and b are correct.
Hence, the answer is a and b.
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1. Beryllium
2. Cadmium
3. Chromium
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5. Mercury
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Select the correct answer using the codes given below:
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2. Other than China, Australia, Canada and Chile, these elements are not found in any country.
3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.
Which of the statements given above is/are correct?
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