1. Bells used in temples are made up of metals and not wood
2. What is petroleum? Why is it called black gold?
3. Describe the process of formation of coal in the nature
4. Why is copper preferred to make electrical wires?
5. What is metalloid?
6. What is coal tar? Write its uses.
Proper answer needed.
Answers
1.The bells are made out of metal and not wood because metals are sonorous, have elastic-like properties, and can sustain vibrations for longer durations than wood. So, the correct answer is “Option D”.
2.The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. Petroleum is very expensive like gold. ... But after the purification of black crude oil, it gives golden colour.
3.Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. ... Some iron and steel making and other industrial processes burn coal. The extraction and use of coal causes many premature deaths and much illness.
4.The lower the level of resistivity, the more electrical conductivity a metal has. Copper has low resistivity, and therefore is an excellent conductor. Copper is also less oxidative than other metals.
5.Metalloids are the smallest class of elements, containing just six elements. They fall between metals and nonmetals in the periodic table. ... Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals.
6.Coal tar is widely used to manufacture paints, perfumes, synthetic dyes, photographic material, drugs and explosives. It can be utilized to make insecticides and pesticides. ... Coal tar is an ingredient of anti-dandruff and lice-repelling shampoos, soaps and ointments.
Answer:
1. Ans:- The bells are made out of metal and not wood because metals are sonorous, have elastic-like properties, and can sustain vibrations for longer durations than wood. So, the correct answer is “Option D”.
2. Ans:- The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. Petroleum is very expensive like gold. ... But after the purification of black crude oil, it gives golden colour.
3. Ans:- Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. ... Some iron and steel making and other industrial processes burn coal. The extraction and use of coal causes many premature deaths and much illness.
4. Ans:- The lower the level of resistivity, the more electrical conductivity a metal has. Copper has low resistivity, and therefore is an excellent conductor. Copper is also less oxidative than other metals.
5. Ans:- A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids.
6. Ans:- Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. Medicinally it is a topical medication applied to skin to treat psoriasis and seborrheic dermatitis. It may be used in combination with ultraviolet light therapy.
Explanation:
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