Chemistry · General Awareness

Chemistry of Metals and Alloys

1,851 Questions

Review the physical and chemical properties of various metals and their common alloys. This collection covers industrial applications, metallurgical processes, and practical uses of elements like silicon and boron. Practice these questions to strengthen your chemistry fundamentals for exams.

Properties of metalsCommon alloysIndustrial metallurgyChemical applications

Chemistry of Metals and Alloys Questions

Multiple choice physics electric charges and fields conductors and insulators introduction to electrostatics electricity

Aluminium metal is :

  1. magnetic substance

  2. bad conductor of heat

  3. good conductor of electricity

  4. bad conductor of electricity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The electrical conductivity of matter is dependent upon the atomic structure of the material from which the conductor is made. In any solid material, such as copper, the atoms which make up the molecular structure are bound firmly together. At room temperature, copper will contain a considerable amount of heat energy. Since heat energy is one method of removing electrons from their orbits, copper will contain many free electrons that can move from atom to atom. When not under the influence of an external force, these electrons move in a zigzag manner within the conductor. This movement is equal in all directions so that electrons are not lost or gained by any part of the conductor. When controlled by an external force, the electrons move generally in the same direction. The effect of this movement is felt almost instantly from one end of the conductor to the other. This electron movement is called an ELECTRIC CURRENT.
Some metals are better conductors of electricity than others. Silver, copper, gold, and aluminum are materials with many free electrons and make good conductors. Silver is the best conductor, followed by copper, gold, and aluminum. Copper is used more often than silver because of cost. Aluminum is used where weight is a major consideration, such as in high-tension power lines, with long spans between supports. Gold is used where oxidation or corrosion is a consideration and a good conductivity is required.
Hence, Aluminium is a good conductor of electricity.

Multiple choice solid waste management environmental management biology

Some of the electronic wastes may contain valuable metals such as gold and copper

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The old, dilapidated mobile phone you replaced with a snazzy, up-to-date version was disposed of properly at the company’s collection centre. You think it has been discarded in an environmentally friendly way. But often that does not happen. Worse, it can contribute to the losses the country makes on account of electronic waste, or e-waste. Mobile phones have precious metals such as gold, silver and palladium; special metals such as cobalt, indium and antimony; and metals such as copper and tin. So, the correct answer is "True".

Multiple choice commercial studies waste generation and management e-waste management e-wastes waste generation

Among these metals given below, which is the most valuable recyclable component of a printed circuit board?

  1. Copper

  2. Silver

  3. Gold

  4. Manganese
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Printed Circuit boards (PCB), also known as green boards are designed specifically to support and facilitate the connection of electronic components. PCB can be recycled. PCBs can be shredded, dismantled, and processed so that valuable precious metals and other materials are separated from other low-value materials.the copper part of the board is totally recyclable as a metallic material. Recycling PCB help reduce depletion of natural resources i.e. copper.
Hence answer is 'Copper'
Multiple choice commercial studies waste generation and management e-waste management e-wastes waste generation

Electronic devices consist of materials such as _____, which are a challenge to recycle.

  1. Lead

  2. Copper

  3. Gold

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Audiovisual components, televisions, VCRs, stereo equipment, mobile phones, other handheld devices and computer components contain valuable elements and substances suitable for reclamation, including lead, copper and gold. One of the major challenges is recycling the printed circuit boards from the electronic wastes. The circuit boards contain such precious metals as gold, silver, platinum, etc., and such base metals as copper, iron, aluminium, etc. 

Multiple choice evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

The silvering on the back surface of a mirror can be done by

  1. Silver

  2. Mercury

  3. None

  4. All kind of shiny materials
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A plane mirror is made from a few mm thick glass plate.one surface of glass plate is polished to a high degree of smoothness which forms the front part of the mirror and the other(back)surface is silvered(I.e painted with silver,mercury or some other material.)

Multiple choice chemistry d and f block elements coloured complexes magnetic nature of transition metals general characteristics of first transition series

Which one of the following elements forms compounds that are all coloured?

  1. Magnesium

  2. Aluminium

  3. Iron

  4. Chromium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Most of the chromium compounds are coloured due to excitation of an electron from a lower energy d-orbital to higher energy d-orbital, the energy of excitation corresponds to the frequency of light absorbed. This frequency lies in a visible region. The colour observed corresponds to the complementary colour of light absorbed.
Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

The alloy bronze contains Copper and Tin. This is a:

  1. homogeneous mixture

  2. heterogeneous mixture

  3. solid solution of two immiscible metals

  4. both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Generally, an alloy is a mixture of two or more elements, at least one of which is a metal, and which exhibits metallic bonding characteristics. It may be either homogeneous (eg a solid solution; i.e. single phase; e.g brass) or heterogeneous ( a mixture of metallic phases e. g. Steel— the iron/carbon system) 

Multiple choice zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

The expensive metals used in catalytic converters of automobiles are.

  1. Cadmium and Rhodium

  2. Platinum, Palladium and Rhodium

  3. Lead and Cadmium

  4. Copper and Cadmium

  5. Lead and Mercury
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Catalytic converter is a device in automobiles that controls the exhaust emission. It has some expensive metals which acts as a catalyst on pollutants such as platinum, palladium and rhodium. These catalysts converts harmful nitrogen oxides into nitrogen gas and carbon monoxide into carbon dioxide. Thus, the correct answer is 'Platinum, Palladium and Rhodium'.

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

Which of the following pair of elements form alloy?

  1. $Zn$ and $Pb$
  2. $Fe$ and $C$
  3. $Hg$ and $Ag$

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Alloys are formed by metals whose atomic radii not differ by more than $15 \%$ so that the atoms of one metal can easily take up the positions in the crystal lattice of the other.
Thus all of these will be the correct answer.