Tag: thermodynamic principles of metallurgy

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Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Hardened steel on heating in the range of $220^{\circ} C$ to $330^{\circ}C$ and on slow cooling gives :

  1. hard steel

  2. Brittle steel

  3. hard and brittle steel

  4. hard and tough steel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hardened steel on heating in the range of $220^{\circ} C$ to $330^{\circ}C$ and on slow cooling gives Hard and tough steel.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the blue colour of the solution changes and a layer gets deposited on iron filings. The colour of the solution and that of the coating would, respectively, be -

  1. Yellow and green

  2. Brown and blue

  3. Red and greenish-blue

  4. Green and reddish-brown
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Fe+CuSO _4\rightarrow FeSO _4+Cu$
                             Green     Reddish brown
Solution becomes green and reddish brown coating of copper is formed.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

In which of the following pair of metals, both are commercially extracted from their respective ores by carbon reduction method?

  1. $Zn$, $Cu$
  2. $Fe$, $Cu$
  3. $Sn$, $Zn$
  4. $Al$, $Ag$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tin and zinc are commercially extracted from their respective ores by carbon reduction method.
The oxide ores of tin and zinc are reduced with carbon to form metals.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Permanent magnets can be made from :

  1. hard steel

  2. cobalt steel

  3. stainless steel

  4. wrought iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A permanent magnet is an object made from material that is magnetized and creates its own persistent magnetic field e.g. refrigerator magnet on its door. These are strongly attracted to magnets called as ferromagnetic and are made up of iron,nickel,cobalt and some alloys of rare earth metals.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

In the metallurgy of iron using blast furnace, the slag is :

  1. $FeSiO _3$
  2. $CaSiO _3$
  3. $CaCO _3$
  4. $CaSO _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Slag is a glass like by product left over after a desired metal has been separated from its ore.Slag is usually a mixture of metal oxides and silicon dioxide.These slags can contain metal sulfides and elemental metals.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

If steel is heated bright red hot and is then cooled slowly, the process is called:

  1. quenching

  2. annealing

  3. tempering

  4. smelting
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Annealing is heat process whereby a metal is heated to a specific temperature/color and then allowed to cool slowly. This softens the metal which means it can be cut and shaped more easily. Mild steel is heated to a red heat and allowed to cool slowly.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Electromagnets are used to concentrate _______ ores :

  1. mercury

  2. copper

  3. Iron

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

Iron ores have the electromagnetic property so they are concentrated by this method. An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Iron :

  1. is a metal i.e. magnetic in nature

  2. forms an alloy called steel

  3. is brittle(cast iron)

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

Iron is the metal of transition series which oxidizes in air to give hydrated iron oxides. Crude iron metal is produced in blast furnaces where ore is reduced by coke to pig iron which has high carbon content.