Advertisements
Advertisements
प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
विकल्प
Right
Wrong
Advertisements
उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
APPEARS IN
संबंधित प्रश्न
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Write the composition of the alloy called bronze.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
An ore of manganese metal is ______.
Which of the following is an ore of mercury metal?
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
- Name the metal and write its chemical symbol.
- Write the name and formula of the sulphide ore.
- Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
- Name a common device in which this metal is used.
- Can this metal displace copper from copper sulphate solution? Why?
Give the principles of the froth floatation process.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
What is meant by refining of metals?
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Zinc sulphide : Roasting : : zinc carbonate : _______
Explain the characteristics of ionic compounds.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
