MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Roasting

Reduction to ...

Question

Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.
Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process, the ore is mixed with carbon and heated in a suitable furnace
Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.
Self-reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in the air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

The metal extracted by electrolysis of its fused salt is :

A

F e

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

P b

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

N a

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

D

C u

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $N a$
Na can not be obtained by electrolysis of the aqueous solution of salt as hydrogen ions have higher reduction potential than $N a^{+}$ so hydrogen ions will reduce first and we will get hydrogen gas instead of Na metal by electrolysis of the aqueous solution,
So sodium metal is extracted by electrolysis of its fused salt.

$N a C l \to N a^{+} + C l^{-}$

At cathode:
$N a^{+} + e^{-} \to N a$

Suggest Corrections

thumbs-up

0

Similar questions

Q. (a) Name two metals which are found in free state in nature.
(b) What chemical process is used for extracting a metal from its oxide ore? Name one metal which is extracted by this method.
(c) Describe the extraction of zinc metal from its sulphide ore as well as its carbonate ore. Write equations of all the reactions involved.

Q. A metal M which is one of the best conductor of heat and electricity used in making electric wires is found in the nature as sulphide ore

M_{2} S

? Which process will be suitable for extraction of this metal M from its ore,

M_{2} S

? Write a balance chemical reaction involved in the process of extraction.

Q. Lead obtained from galena ore (PbS) by air reduction or carbon reduction process contains base metal (Cu, Bi, As, Sn, Zn) as impurities. Which of the following electrolyte is used for electrolysis of Pb ?

Q. Consider the following isolation/purification processes.

(I) Heating impure metal with

I_{2}

150 - 200^{\circ} C

and passing the resulting volatile iodide on hot tungsten filament at

1400^{\circ} C

to get the pure metal.
(II) Heating the sulphide ore in the air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide to get the metal.
(III) Electrolysis of the molten electrolyte containing metal oxide and cryolite or fluorspar to obtain the metal.

The processes used for obtaining aluminium, titanium and lead are respectively :

Q. A metal 'M' which is one of the best conductor of heat and electricity is used in making electric wires is found in nature as sulphide ore

M_{2} S

?
(i) Name the metal 'M'.
(ii) Which process will be suitable for extraction of this metal M from its ore

M_{2} S

? Write the balanced chemical reactions involving in the process of extraction. With the help of a labelled diagram, explain the process of electrolytic refining of the metal.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Roasting

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard X Chemistry

Join BYJU'S Learning Program

CrossIcon