Tag: principles and processes of isolation of elements
Questions Related to principles and processes of isolation of elements
Silver can be separated from lead by:
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Distillation
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Amalgamation
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Filtration
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Cupellation
Cupellation is a process where ores are treated under high temperatures and controlled operations to separate noble metals like gold and silver from base metals like lead, copper, zinc, and others present in the ore or alloyed metal.
Refining of silver is done by___________.
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liquidation
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poling
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cupellation
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van Arkel method
Cupellation is a process where ores are treated under high temperatures and controlled operations to separate noble metals like gold and silver, from base metals like led, copper, zinc, and others present in the ore or alloyed metal.
Refining of silver is done by________.
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liquidation
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Poling
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cupellation
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van Aekel method
Cupellation is a process where ores are treated under high temperatures and controlled operations to separate noble metals like gold and silver, from base metals like led, copper, zinc, and others present in the ore or alloyed metal.
Cupellation process is used in the metallurgy of:
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Copper
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Silver
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Aluminium
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Iron
Cupellation is a process where ores are treated under high temperatures and controlled operations to separate noble metals like gold and silver, from base metals like led, copper, zinc, and others present in the ore or alloyed metal.
When alloy of silver and lead is rich in silver:
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Cupellation process is used
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Parke's method is used
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Pattinson's method is used
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Any of the above methods can be used
When alloy of silver and lead is rich in silver, cupellation process is used.
The silver metal can be obtained in when alloy of silver and lead is rich in lead is:
i) Parke's process
ii) Pattinson's process
Softening of lead means:
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Melting pure lead at high temperature
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Removal of impurities, except silver, present in commercial lead
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Formation of lead alloy
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Formation of 100% pure lead
We know the melting point of pure lead is very high. Softening of lead means removal of metallic impurities, except silver, present in the commercial lead.
Tin is not refined by:
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Liquidation
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Zone refining
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Poling
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None of the above
When alloy of silver and lead is rich in silver :
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CupelIation process is used
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Parke's method is used
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Bett's method is used
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All of the above method
Refining of tin can be done by :
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cupellation
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liquation
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poling
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electrorefining
Extraction of metal from the ore cassiterite involves
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carbon reduction of an oxide ore
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self- reduction of an sulphide ore
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removal of iron impurity
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both A and C
Tin is obtained by reducing the ore cassiterite with coal in a reverberatory furnace; limestone is added to produce a slag with impurities, which can be removed.
$SnO _2 + 2C \longrightarrow Sn + 2 CO$.
Crude tin so obtained is contaminated with iron, lead, and other metals. It is, therefore, remelted on an inclined furnace. The process is called liquation. The easily fusible tin metals away and the less fusible impurities are left behind. Molten tin is finally stirred with green poles of wood in contact with air. In this process, any remaining metal impurities are oxidized forming a scum, which rises to the surface and is removed. This process is called polling.