Tag: elements and compounds

Questions Related to elements and compounds

Monel metal is a metallic alloy of copper and nickel with $5$% iron. It is used in making:

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

  1. locks

  2. strong boxes

  3. almirahs

  4. motor parts

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Correct Option: A
Explanation:

Monel is a group of nickel alloys, primarily composed of nickel (up to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater.

Being stronger than pure nickle Monel metal is used in making locks.
Hence option A is correct answer.

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.