Chemistry · General Awareness

Chemistry of Metals and Alloys

1,762 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 chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Alkaline earth metal(s) which does (do) not
impart colour to the flame is (are):

  1. Be

  2. Mg

  3. Ca

  4. Sr
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Beryllium($Be$) and magnesium($Mg$) cannot give flame test. They have small size. They strongly binds their electrons. Thus they have high ionization enthalpies. The thermal energy of flame is not sufficient to excites their electrons.

Multiple choice aluminium patterns and properties of metals chemistry

Thermite is a mixture of iron oxide and ___________.

  1. aluminium powder

  2. zinc powder

  3. iron turnings

  4. copper turnings
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer:- (A) Aluminium Powder
Thermite is the mixture of iron oxide $Fe _2O _3$ (rust) and aluminum powder. When it is ignited the aluminum powder reacts with the $O _3$ part of the rust in a highly exothermic reaction, the resulting product is molten iron. Thermite is commonly used in welding because the molten iron has the ability to seep into cracks in metal.

Multiple choice aluminium patterns and properties of metals chemistry

Which of the following metal is protected by a layer of its own oxide?

  1. Silver

  2. Sodium

  3. Aluminium

  4. Iron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium is reactive and reacts spontaneously with water or air to form aluminium oxide $(Al _2O _3)$, forms a stable passive layer which protects aluminium from corrosion or further oxidation.

Multiple choice aluminium patterns and properties of metals chemistry

Duralumin is a alloy. It does not contains:

  1. $Al$
  2. $Cu$
  3. $Mg$
  4. $Na$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Duralumin is an alloy of aluminium that has copper and contains small amounts of magnesium, manganese, iron, and silicon: its applications requiring lightness and strength, as in aeroplane construction.So sodium is not present in Duralumin.

Hence option $D$ is correct.

Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

What does the bulb of a clinical thermometer contain?

  1. Water

  2. Mercury

  3. Iron

  4. Zinc
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A clinical thermometer is a thermometer used to measure human body temperature. Most old ones use mercury thermometer. It is accurate and sensitive, because it has a narrow place where the mercury level rises very fast.

These thermometers are used in clinics by doctors, so they are also called a doctor's thermometers or medical thermometers. Most of them show both Celsius scale and Fahrenheit temperature scales. The scale runs from 35 degree Celsius to 42 degree Celsius.

Medical thermometers are cleaned before and after each use, with alcohol.
Multiple choice chemistry the periodic table dobereiner's triads development of the modern periodic table into the history

Which of the following is an artificial element made by man?

  1. Gallium

  2. Iron

  3. Helium

  4. Americium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
In chemistry, a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially. So far, 24 synthetic elements have been created (those with atomic numbers 95–118). Americium is one of them having atomic no. 95.

Hence, the answer is option $D$.
Multiple choice nanochemistry nanotechnology applied chemistry materials chemistry

Gold nanoparticles are highly effective as:

  1. selective oxidation catalysts

  2. selective reduction catalysts

  3. non selective oxidation catalysts

  4. non selective reduction catalysts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gold nanoparticles are highly effective as selective oxidation catalysts. It is used in the oxidation of alcohols and aldehydes.

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.