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

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 Read More …

Write a note on fractional distillation of petroleum.

  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 Read More …

Write a detailed note on Ammonia Solvay process.

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 Read More …

What is the difference between crude oil and residual oil?

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 Read More …

Give the reaction of formation of ammonia in the process.

No.iv. Give the reaction of formation of ammonia in the process. Answer. It is prepared by the Haber’s process. One volume of nitrogen (from air) and three volumes of hydrogen (obtained by passing methane and steam over heated nickel catalyst) Read More …

Define concentration process used in metallurgy of copper.

No. i. Define concentration process used in metallurgy of copper. Answer. The process of removal of gangue from the ore is technically known as concentration and the purified ore is called the concentrate. The concentration process used in metallurgy of Read More …

Give the characteristics of polysaccharides.

No.5. Give the characteristics of polysaccharides. Answer. Polysaccharides are macromolecular carbohydrates consisting of hundreds to thousands of monosaccharide. Examples of polysaccharides are starch and cellulose. They are amorphous solids. They are tasteless and insoluble in water. They are none reducing Read More …

Which elements are found in proteins?

Test Yourself 13.2 (PROTEINS) No. i. Which elements are found in proteins? Answer. Proteins consist of carbon, hydrogen, oxygen, nitrogen and sulphur elements. No. ii. How amino acids are bonded with each other? Answer. The amino acids link through peptide Read More …

What is coke? For what purpose it is used? Which is the best quality of coal?

No. iii. What is coke? For what purpose it is used? Which is the best quality of coal? Answer. Coke has 98% carbon. It is left behind residue of coal. When coal is subjected to destructive distillation, it loses all Read More …

Find the pH of 0.01M sulphuric acid?

Problem.10.3. Find the pH of 0.01M sulphuric acid? Solution: Sulphuric acid is a strong dibasic acid. It ionizes completely and its one mole produces 2 moles of hydrogen ions. H2SO4(aq)   —————   2H+(aq) + SO42-(aq) Therefore,   0.01M   sulphuric   acid   will   produce   Read More …

Classify the following salts as soluble or insoluble salts:

No.10. Classify the following salts as soluble or insoluble salts: Sodium chloride Silver nitrate iii. Lead chloride Copper sulphate Barium sulphate Ammonium chloride vii. Sodium carbonate viii. Calcium carbonate Ferric chl6ride Magnesium sulphate   Answer. Soluble Salt: Sodium chloride, Silver Read More …

How the insoluble salts are prepared?

No.14. How the insoluble salts are prepared? Answer. In this method, usually solutions of soluble salts are mixed. During the reaction exchange of ionic radicals take place to produce two new salts. One of the salts is  insoluble and the Read More …