Advertisements
Advertisements
Question
Write scientific reason.
Anodes need to be replaced from time to time during the electrolysis of alumina.
Solution
In the electrolysis of alumina, graphite rod is used as anode.
- During the electrolytic reduction of alumina, aluminium is produced at the cathode and oxygen gas is evolved at the anode.
- This gas reacts with the graphite rods (anode) and forms carbon dioxide.
Thus, the graphite rods are continuously eroded. Hence, anodes are replaced from time to time during the electrolysis of alumina.
RELATED QUESTIONS
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Sodium is a very reactive metal. ( )
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
Give the composition of an alloy called solder. State its one property and one use.
Fill in the following blank with suitable word:
Brass is an alloy of copper and .........
Fill in the following blank with suitable word:
The alloy in which one of the metals is mercury is called an ...............
Mention two uses of the following metals and non-metals
Iodine
Give reasons
Aluminium is used in making aircrafts.
A metal which is neither ductile nor malleable is
Name a metal which is best conductor of electricity :
State the position of the following in the periodic table:
Iron and zinc
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Why is hydrogen placed with alkali metals?
What was Mendeleev's basis for the classification of elements?
What is it made from? Why?
A pair of tongs.
With reference to the following metals state their use in daily life metal:
Aluminium
With reference to the following metals state their use in daily life metal:
Lead
With reference to the following metals state their use in daily life metal:
Silver
Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37°C)
In the given figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.
- ______ is a metal.
- Metals are good ______ of electricity.
Which metal has the highest ductility?
