Tag: metals and non metals

Questions Related to metals and non metals

Electrolysis is used for refining certain metals such as copper and zinc.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. True

  2. False

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Correct Option: A
Explanation:

Electrolysis, process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron (oxidation or reduction).

It is extensively used in metallurgical processes, such as in extraction (electrowinning) or purification (electrorefining) of metals from ores or compounds and in deposition of metals from solution (electroplating). Electrolysis of salt of copper and zinc results in the deposition of pure copper and zinc on cathode of the electrolytic cell.
option A is correct

'Softening of lead' means ___________.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. conversion of lead to $PbO$

  2. conversion of lead to $Pb _{3}O _{4}$

  3. removal of impurities(metallic) from lead

  4. washing lead with $HNO _{3}$ followed by alkali solution

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Correct Option: C
Explanation:

The removal of  metallic impurities from lead is known as 'Softening of lead'.

In the electrolytic refining of a metal M, what would you take as the anode is : 

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. impure metal M

  2. thin strip of pure metal M

  3. solution of salt of the metal M

  4. none of these

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Correct Option: A
Explanation:

The purest copper is obtained by an electrolytic process using impure copper as the anode and a thin sheet of pure copper as cathode. The electrolyte is an acidic solution of copper sulphate. By passing electricity copper is dissolved from anode and deposits at cathode.

On the basis of following features identify the correct option:
I. This metal is not obtained in free state.
II. This metal is obtained by electrolysis of their chlorides in molten state.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. $Na$

  2. $Ca$

  3. both (1) and (2)

  4. neither (1) nor (2)

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Correct Option: C
Explanation:

Both Sodium and calcium are highly reactive metal oxides are not reduced by carbon and these metals are obtained in free state by electrolytic reduction of their molten chloride salts.

In electrolytic refining, which one is the anode and which is cathode?

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. Pure metal is the anode and impure metal is cathode

  2. Impure metal is made anode and pure metal cathode

  3. Both can be done interchangeably

  4. None of the above

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Correct Option: B
Explanation:

In electrolytic refining, impure metal is made the anode and a thin strip of pure metal is made the cathode.

Why refining of metals is required?

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. They are hard

  2. They are impure

  3. They are lustrous

  4. They are malleable

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Correct Option: B
Explanation:

Refining of metals is required because the metals that have been extracted by concentration of ore are still impure.

Separation of impurities from the extracted metals is known as __________.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. distillation

  2. roasting

  3. calcination

  4. refining

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Correct Option: D
Explanation:

Separation of impurities from the extracted metals is known as refining of metals.

Impurities present at anode are deposited at the bottom and called as _______.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. anode dust

  2. anode particulate

  3. anode mud

  4. anode impurities

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Correct Option: C
Explanation:

In the electrolytic refining the process the impure sample is used as anode and pure metal is obtained at cathode. Impurities present at anode are deposited at the bottom and called as anode mud.

Refining of aluminium is done by __________.

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. electrolysis

  2. distillation

  3. sedimentation

  4. oxidation

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Correct Option: A
Explanation:

Refining of aluminium is done by electrolytic method. The aluminium obtained is 99.99% pure.

Which of the following is not a method of refining?

chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

  1. Roasting

  2. Electrolysis

  3. Distillation

  4. Oxidation

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Correct Option: A
Explanation:

Roasting is the method of converting the ore to its oxide form . It is not a method of refining.