How crude oil is refined? Explain the important fractions of petroleum along with their usage.

Posted Posted in Chapter No.16, Chemistry 10

No.6. How crude oil is refined? Explain the important fractions of petroleum along with their usage. Answer.   Crude   oil   is   refined   by   fractional   distillation   in   a fractionating tower. Important Fractions of Petroleum Each fraction is not a single compound. Rather each one is a mixture of hydrocarbons having different number of carbon atoms in it. […]

Write a note on fractional distillation of petroleum.

Posted Posted in Chapter No.16, Chemistry 10

  No.4. Write a note on fractional distillation of petroleum. Answer. The crude oil is refined in the refineries. Refining process is the separation of crude oil mixture into various  useful  products (fractions). It is carried out by a process called fractional distillation. The principle of fractional distillation is based upon separation of substances depending […]

Write a detailed note on Ammonia Solvay process.

Posted Posted in Chapter No.16, Chemistry 10

No.3. Write a detailed note on Ammonia Solvay process.  Answer. Principle of Solvay process lies in the low solubility of sodium bicarbonate at low temperature i.e. at 15°C. When CO2 is passed through an ammonical solution of NaCl called ammonical brine, only NaHCO3 precipitates. Na+(aq) + HCO3–(aq)         NaHCO3(s) Raw Materials: The raw materials needed for […]

What is the difference between crude oil and residual oil?

Posted Posted in Uncategorized

No.16. What is the difference between crude oil and residual oil? Answer. Crude oil is the dark brownish viscous liquid formed by decomposition of remains of dead plants and animals in the absence of air because of high pressure, temperature and bacterial effects. When it is heated in a furnace up to 400°C under high […]

What happens when ammonical brine is carbonated?

Posted Posted in Chapter No.16, Chemistry 10

No.7. What happens when ammonical brine is carbonated? Answer. Ammonical brine is fed into carbonating tower and carbon dioxide is passed through it. Following reactions take place in the carbonating tower. CO2(g) + NH3(g) + H2O                NH4HCO3(1) NH4HCO3(1) + NaCl (brine)            NaHCO3(1) + NH4Cl(s) The temperature of the mixture is lowered to 15°G and precipitates […]

Mention the chemical reaction for the formation of metallic copper in the bessemerization process.

Posted Posted in Chapter No.16, Chemistry 10

No. vii. Mention the chemical reaction for the formation of metallic copper in the bessemerization process. Answer. In the bessemerization process molten matte is further heated. Molten matte is mixed with sand and heated with a hot blast of air through tuyers. Ferrous sulphide is oxidized to form ferrous oxide. Which react with sand to […]

What is water pollution? Describe the effects of using polluted water?

Posted Posted in Chapter No.15, Chemistry 10

No.8. What is water pollution? Describe the effects of using polluted water. Answer. Water pollution is a contamination of water bodies (e.g. lakes, rivers, oceans and ground water). Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful Compounds. Water pollution has the following effects: (i)      […]

Explain five important waterborne diseases. How can these be prevented?

Posted Posted in Chapter No.15, Chemistry 10

  No.6. Explain five important waterborne diseases. How can these be prevented? Answer. The important waterborne diseases are (i) Diarrhea diseases. Intestinal diseases, such as cholera, that may cause dangerous dehydration. Diarrhea may be caused by viruses, bacteria, or parasites. (ii) Cholera   Cholera is an acute infection caused by the bacteria Vibrios choleroe, which may […]