Occurrence of Metals

What is metal?

The Thermit process is used for repairing cracks in railway tracks on site.

(a) Write the equation for the reaction taking place in the process, mentioning the physical states of the reactants and products.

(b) What information in the chemical equation indicates that the reaction is exothermic?

Ashok has written the following reactions to show how metals can be obtained from their ores.

P) $2{\mathrm{Fe}}_2{\mathrm{O}}_3+3\mathrm{C}\to 4\mathrm{Fe}+3{\mathrm{CO}}_2$

Q) ${\mathrm{Na}}_2\mathrm{O}+\mathrm{C}\to 2\mathrm{Na}+\mathrm{CO}$

R) $\mathrm{ZnO}+\mathrm{C}\to \mathrm{Zn}+\mathrm{CO}$

S) $\mathrm{CuO}+\mathrm{C}\to \mathrm{Cu}+\mathrm{CO}$

Identify the INCORRECT reaction(s) among them.

During the electrolytic refining of copper what happens at the anode?

Write methods of separating impurities in ore

Copper is extracted from

Name the chief form of occurrence of the following in the earth's crust zinc.

Name a sulphide ore of copper.

Which of the following metals exist in their native states in nature?

The zinc oxide formed after the process of calcination or roasting undergoes reduction to obtain or extract zinc.

In the roasting process, when sulphide ore is heated strongly in the presence of air, it is converted into metal oxide and releases the gas:

In the calcination process, when carbonate ore is heated strongly in the absence of air, it is converted into a metal oxide and releases carbon dioxide. 

What is the difference between calcination and roasting?

Cinnabar is heated in air which converts it into:

What is the chemical formula of Cinnabar?

Extraction of mercury from cinnabar is achieved by:

Manganese metal is extracted from manganese dioxide by a reduction process by making use of:

The hardest known mineral is

Identify the gemstone in Silvia’s ring.

Which among the following is the softest mineral?