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 physics electric current and its effects electric fuse electrical fuse and mcb fuse

Fuse wire is made up of

  1. Alloy

  2. Mixture

  3. Metals

  4. Non metals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fuse is generally made up of  an alloy of tin and lead. It is used in series with an appliance to prevent it from damage when excessive flows through the appliance. Material to be used in fuse wire must have Low melting point, low boiling point and high electric resistance.

Multiple choice physics electric current and its effects electric fuse electrical fuse and mcb fuse

Which wire could be used as a fuse wire?

  1. Nichrome wire

  2. Zinc

  3. Copper

  4. Silver
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

The fuse element is made of zinc, copper, silver, aluminum, or alloys to provide stable and predictable characteristics. The fuse ideally would carry its rated current indefinitely, and melt quickly on a small excess.

Multiple choice physics electric current and its effects electric fuse electrical fuse and mcb fuse

Complete the following sentences :

A fuse wire is made of an alloy of .......... and ..........

  1. lead, tin

  2. nickel , lead

  3. cadmium, lead

  4. nickel, tin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A  fuse is the device to protect the electric circuits from over loading and short circuit.
Fuses are safety devices that are to be built into our electrical system. If there were no fuses and we operated too many appliances on a single circuit, the cable carrying the power for that circuit would get extremely hot, short circuit, and possibly start a fire. To prevent electrical overloads, fuses are designed to trip or blow, stopping the flow of current to the overloaded cable.
Fuse is a piece of wire of a material with a very low melting point. When a high current flows through the circuit due to overloading or short circuit, the wires gets heated and melts. As a result, the circuit is broken and current stops flowing. 
Hence, the fuse element is made of zinc, copper, silver, aluminum, or alloys to provide stable and predictable characteristics.
The fuse must always be connected to the mains and it must be of correct value. For example, a 15-ampere fuse should trip when the current through it exceeds 15 amperes. A 20-ampere fuse should blow when the current through it exceeds 20 amps.
Hence, A fuse wire is made of an alloy of lead and tin If the current in a circuit rises too high, the fuse wire melts.

Hence correct option is option A.

Multiple choice physics electric current and its effects electric fuse electrical fuse and mcb fuse

Fuse wire is made of :

  1. Platinum

  2. Copper

  3. Aluminium

  4. Alloy in tin and lead
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Electric fuse wire is a wire which allows only upto a limit of current through it , if a particular amount of value of current is exceeded then it melts down.

so for achieving the melting property the fuse wire is made up of an alloy made of tin  63 % & lead 37 % . which can melt down over low temperatures.

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Oxides of the various metals are converted into metal by heating but not in :

  1. $Ag _2O$

  2. CuO

  3. HgO

  4. all are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxides of various metal oxides are converted into metals on heating but CuO (copper oxide) does not not converted into metal on heating but by reaction with Cu2S.

CuO + Heat$ \rightarrow$ no reaction
So, answer is B.

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which will not give metal on heating ?

  1. $Ag _2CO _3$
  2. $ZnCO _3$
  3. $HgO$
  4. $CuO$
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation
A) $Ag _2CO _3(s)\rightarrow 2Ag(s) + CO _2(g) + O _2(g)$ on heating gives Ag(metal).
B) $ZnCO _3(s)\rightarrow ZnO(s) + CO _2(g)$ on heating  do not give metal it gives ZnO(zinc oxide).
C) $2HgO(heat)\rightarrow 2 Hg + O _2$ on heating gives Hg(metal).
D) CuO when heated in presence of sulfuric acid it also gives CuO again, hence CuO on heating do not give metal.
Hence option B and D are correct.
Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

In which of the following isolations is no reducing agent required?

  1. Iron from haematire

  2. Tin from tin oxide

  3. Mercury from cinnabar

  4. Zine from zinc blende
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cinnabar ore is relatively concentrated, it can be processed directly without any intermediate steps to remove waste material and without requirement of a reducing agent. 

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which of the following oxides cannot be reduced to metal by carbon?

  1. $ZnO$
  2. $Al _2O _3$
  3. $CuO$
  4. $CaO$
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

Generally carbon is more reactive than $Zn$ and $Cu$. Hence, $ZnO$ and $CuO$ can be reduced by carbon leading to the formation of corresponding metals,  but carbon is less reactive than $Ca$ and $Al$, so $CaO$ and $Al _2O _3$ can not be reduced by carbon .

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

The support base used for the noble metals in catalytic reforming is/are: 

  1. alumina

  2. silica

  3. silica-alumina

  4. all
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

In catalytic reforming process, high octane number reformate is formed which is the main component of the motor, fuel, aviation gasoline or aromatic rich feedstock. The noble metals platinum and rhenium are the catalysts used on a silica or silica-alumina support base. Fresh catalyst is chlorinated prior to use.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

The metal(s) used as a catalyst in catalytic reforming of petroleum is/are:

  1. rhenium

  2. molybdenum

  3. platinum

  4. palladium
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

In catalytic reforming process, high octane number reformate is formed which is the main component of a motor, fuel, aviation gasoline or aromatic rich feedstock. The noble metals platinum and rhenium are the catalysts used for it.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Which metal is obtained as by-products during metallurgy of Lithium ?

  1. Rubidium

  2. Caesium

  3. Both Rubidium and Caesium

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the extraction and processing of lithium, specifically from mineral sources like lepidolite or pollucite, rubidium and caesium are frequently obtained as valuable by-products due to their chemical similarities and concurrent occurrence.