Tag: thermodynamic principles of metallurgy

Questions Related to thermodynamic principles of metallurgy

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

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

  1. hard steel

  2. Brittle steel

  3. hard and brittle steel

  4. hard and tough steel

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Correct Option: D
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.

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 -

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

  1. Yellow and green

  2. Brown and blue

  3. Red and greenish-blue

  4. Green and reddish-brown

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Correct Option: D
Explanation:

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

In the extraction of iron, the most preferred ores are :

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

  1. Hematite and limonite.

  2. Copper pyrites and siderite.

  3. Magnetite and iron pyrites.

  4. Limonite and copper pyrites.

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Correct Option: A
Explanation:

Hematite and Limonite are the most preferred ores in the extraction of iron.

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

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

  1. $Zn$, $Cu$

  2. $Fe$, $Cu$

  3. $Sn$, $Zn$

  4. $Al$, $Ag$

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Correct Option: C
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.

Permanent magnets can be made from :

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

  1. hard steel

  2. cobalt steel

  3. stainless steel

  4. wrought iron

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Correct Option: D
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.

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

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

  1. $FeSiO _3$

  2. $CaSiO _3$

  3. $CaCO _3$

  4. $CaSO _3$

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Correct Option: B
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.

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

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

  1. quenching

  2. annealing

  3. tempering

  4. smelting

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Correct Option: B
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.

Electromagnets are used to concentrate _______ ores :

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

  1. mercury

  2. copper

  3. Iron

  4. sulphur

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Correct Option: C
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.

Iron :

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

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

  2. forms an alloy called steel

  3.  is brittle(cast iron)

  4. All of these

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Correct Option: D
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.

The metal which is present in our body in red blood corpuscles and whose deficiency in the body causes anaemia is

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

  1. zinc

  2. arsenic

  3. iron

  4. tin

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Correct Option: C
Explanation:

Iron is the metal present in our body in red blood corpuscles and its deficiency in the body causes anaemia.