Tag: extraction of metals from ore

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

What will happen during roasting?

  1. The sulphide ores are converted into oxides

  2. The oxide ores are converted into sulphides

  3. The sulphide ores are converted into carbonates

  4. The oxide ores are converted into carbonates.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During roasting, the sulphide ores are converted into oxides by heating strongly in excess of air.
$ZnS + 3O _2 \rightarrow 2ZnO + 2SO _2$

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

Which if the following is a common reducing agent for extracting metals from ore?

  1. $CO$

  2. Carbon

  3. Hydrogen

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

Reduction is the process of removal of oxygen for extraction of metals from their oxide ores. The common reducing agents used for reduction of metal oxides are: Carbon monoxide,  Carbon, Hydrogen.

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

During electrolysis, electrons are being added directly to the metal ions at the ___________.

  1. anode

  2. cathode
  3. both $A$ and $B$

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During electrolysis, electrons are being added directly to the metal ions at the cathode (the negative electrode). The downside (particularly in the aluminum case) is the cost of the electricity. An advantage is that it can produce very pure metals.

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

Which of the following technique uses high temperature to convert ore into raw metals?

  1. Pyrometallurgy

  2. Hydrometallurgy

  3. Both a and b

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

After the ore is mined, the metals must be extracted, usually by chemical or electrolytic reduction. Pyrometallurgy uses high temperatures  to convert ore into raw metals, while hydrometallurgy employs aqueous treatment for the same purpose.

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

Metals more reactive than carbon are usually extracted by_________.

  1. Pyrolysis

  2. Electrolysis

  3. Fractional distillation

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

Metals more reactive than carbon are usually extracted by electrolysis. Electrolysis is the process of breaking down a compound using electrical energy and is needed to extract  the most reactive metals. 

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

What is the most common type of electrometallurgical processes to obtain pure metal?

  1. Electro-refining

  2. Electrowinning

  3. Both a and b

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

The most common types of electrometallurgical processes are electrowinning and electro-refining. Electrowinning is an electrolysis process used to recover metals in aqueous solution, usually as the result of an ore having undergone one or more hydrometallurgical processes. Electro-refining is used to dissolve an impure metallic anode and produce a high purity cathode. 

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

Which of the following is a physical mean for concentration of ore?

  1. Using sodium hydroxide

  2. Using electrolysis

  3. Froth flotation method

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

In many cases, it is possible to separate the metal compound from unwanted rocky material by physical means. A common example of this involves froth flotation. In this method, the unwanted object binds with air and comes on the surface as bubbles.

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore
State the given statement is true or false.
Statement: Mercuric oxide is reduced by thermal decomposition.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds. A metal carbonate decomposes into a metal oxide and carbon dioxide gas.

$2HgO(s) \overset{\Delta}\longrightarrow 2Hg(l) + O _2(g)$

Hence, the given statement is $true$.