मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Write the molecular formulae of the following compound. Cryolite

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प्रश्न

Write the molecular formulae of the following compound.

Cryolite

एक शब्द/वाक्यांश उत्तर
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उत्तर

Cryolite- Na3AlF6

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पाठ 8: Metallugy - Solve the following Questions

संबंधित प्रश्‍न

Define the Ore.


Write the composition of the alloy called bronze.


Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?


Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu


State three objectives achieved during the roasting of ores.


State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.


 Give the chemical formula of : 
Bauxite 


Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.


What is galvanized iron.


Name:
The allotrope of the non-metal carbon which conducts electricity.


Name a non- metal that has a metallic luster and sublimes on heating.


To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.


Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass


Answer the following question :
What is the difference between calcination and roasting.


Name the following:
A steel grey coloured solid non-metal.


Name the methods by which concentrated ore is converted to metallic oxide.


Usually ______ ores are subjected to ______ which is done in the absence of air.


What is the difference between calcination and roasting?


Write the name.

The process of strong heating of carbonate ores in insufficient air–


Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?


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