Minerals and Energy Resources Test - 27

• Non-metallic minerals are those which do not yield new products on melting. 
  
• For example, phosphorus, iodine, carbon, selenium, limestone, dolomite, gemstones, clay, mica, sulphur, etc., are the non-metallic minerals.

• The Frasch process is a method to extract sulfur from underground deposits.
  
•  It is the only economic method of recovering sulfur from elemental deposits.
  
• In the Frasch process, superheated water is pumped into the sulfur deposit; the sulfur melts and is extracted. 
  
• The Frasch process is able to produce high purity sulfur.
  
• In the Frasch process, three concentric tubes are introduced into the sulfur deposit. Superheated water (443k,165 °C, 2.5-3 MPa) is injected into the deposit via the outermost tube. Sulfur (m.p. 115 °C) melts and flows into the middle tube.
  
•  Water pressure alone is unable to force the sulfur into the surface due to the molten sulfur's greater density, so hot air is introduced via the innermost tube to froth the sulfur, making it less dense, and pushing it to the surface.
  
• The sulfur obtained can be very pure (99.7 - 99.8%).
  
•  In this form, it is light yellow in color
  

Asbestos was seen as a reasonably priced preservative that could be used to make a variety of reasonably priced, fire-resistant products, including materials such as roofing shingles, wallboard and concrete. It was natural fibre into textiles to make fireproof fabric and cloths, plus fireproof insulations and coatings. 

Asbestos workings well as a fireproof material because of its chemical properties. It is non-flammable and has a melting point of around 1600 degrees Fahrenheit. It consists of lightweight fibbers’ that is stronger than cotton, rayon or nylon. Those fibbers are also flexible enough to be woven with other fibres, mixed and sprayed with cement or packed with other materials.

 

Thus, the correct option is C.

• Mica is a non-metallic mineral which can be split into thin sheets.
  
• It is used in electric and electronic industries.

• Mica is a non-metallic mineral which can be split into thin sheets.
  
• It is used in electric and electronic industries.

Mica is mainly used in electrical and electronic industries. It is a non metallic mineral and can be split into thin sheets which are tough and flexible. China is the largest producer of Mica.

For over hundred years, India had enjoyed monopoly in production and export of sheet mica in the world. Of late, there has been a steep decline in mica production in India, largely due to technological improvements that facilitate use of reconstructed mica and emergence of mica substitutes consequently resulting into fall in the demand of natural mica in the world market. Still India stays at a higher position in the list of largest producers of mica in the world.

Manganese is mainly used in the manufacturing of steel and ferromanganese alloy. Nearly 10 kg of manganese is required to manufacture one tonne of steel. It is also used in manufacturing bleaching powder, insecticides and paints.

Although some quantity of iron ore is found in several parts of the country, the major part of the reserves are highly concentrated in a few selected areas. Only six states i.e. Jharkhand, Orissa, Madhya Pradesh, Chhattisgarh, Karnataka and Goa account for over 95 per cent of the total reserves of India.