The salt which is least likely to be found in minerals

Ore dressing of iron ore is done by

For which of the following ores,froth floatation process is applicable?

Which of the following benefaction processes is used for the mineral,Al₂O₃.2H₂O?

Heating pyrites to remove sulphur is called

Name one chief ore each of copper and aluminium. Name the method used for the concentration of these two ores.

Explain is the significance of leaching in the extraction of aluminium?

How are metals used as semiconductors refined? What is principle of method used?

Give two requirements for vapour phase refining.

State the role of 
(i) depressant in froth floatation process.
(ii) silica in the metallurgy of copper.
(iii) graphite rod in the electrolytic reduction of alumina.

Describe how the following changes are brought about:
(i) Pig iron into steel.
(ii) Zinc oxide into metallic zinc.
(iii) Impure titanium into pure titanium.

Describe the role of the following:
(i) NaCN in the extraction of silver from a silver ore.
(ii) Iodine in the refining of titanium
(iii) Cryolite in the metallurgy of aluminium

Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

While washing a miner's overalls, a washerwoman noticed that sand and similar dirt fell to the bottom of the washtub. What was peculiar, the copper-bearing compounds that had come to the clothes from the mines were caught in the soaplids and so they came to the top. One of her clients was a chemist, Mrs. Malik. The washerwoman told her experience to Mrs. Malik. The latter thought that the idea could be used for separating copper compounds from rocky and earth materials on a large scale. After reading the above passage answer the following questions-
What type of ores are concentrated by this process?

While washing a miner's overalls, a washer woman noticed that sand and similar dirt fell to the bottom of the wash tub. What was peculiar, the copper bearing compounds that had come to the clothes from the mines were caught in the soaplids and so they came to the top. One of her clients was a chemist, Mrs. Malik. The washer woman told her experience to Mrs. Malik. The latter thought that the idea could be used for separating copper compounds from rocky and earth materials on a large scale. After reading the above passage answer the following questions-
What values are shown by washer woman and Mrs.Malik?

Metals are very useful in our daily life. Aluminium powder is used in white paints. It is also used as a reducing agent. Alloys containing aluminium being light, are very useful. Utensils of aluminium are more popular than utensils of brass. Metals like silver, gold, iron, copper, zinc are very useful in our daily life.
(i) Which metal foils are used as wrappers for sweets, medicines, chapaties ties etc ?
(ii) Why are aluminium vessels preferred over copper and bronze vessels?
(iii) What value is associated for using aluminium?

Metals are very useful in our daily life. Aluminium powder is used in white paints. It is also used as a reducing agent. Alloys containing aluminium being light, are very useful. Utensils of aluminium are more popular than utensils of brass. Metals like silver, gold, iron, copper, zinc are very useful in our daily life.
Why are aluminium vessels preferred over copper and bronze vessels?