Tag: metals, alloys and crystals

Questions Related to metals, alloys and crystals

Which of the following is not an alloy containing tin metal?

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Solder for soldering electrical contacts

  2. Pewter for hardness

  3. Bronze for statues

  4. Brass for articles like bangles and utensils

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Correct Option: D
Explanation:

 Brass for articles like bangles and utensils.

Brass is an alloy of copper and zinc having molecular formula ${Cu} _{3}{Zn} _{2}$

Which of the following is a steel that is resistant to acids?

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. Nickel alloy steel

  2. Molybdenum steel

  3. Stainless steel

  4. Cobalt alloy steel

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Correct Option: B
Explanation:

Molybdenum can be obtained from the minerals molybdenite, wulfenite and powellite. It is also obtained as a byproduct during tungsten and copper mining and processing. It has one of the highest melting points of all pure elements; however it is not resistant to acids.Hence, molybdenum steel is also not resistant to acids.

Hence option B is correct answer.

In metallurgy of iron, limestone provides flux for removing impurities as slag.

chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

  1. True

  2. False

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Correct Option: A
Explanation:

The above statement is true.
In agglomeration and separation of melted or smelted copper it is necessary to introduce iron oxide or limestone as flux to remove the impurities.