15. How will you separate a mixture containing sand, iodine and sodium chloride?
16. How will you separate the components of gunpowder?
17. How will you separate a mixture containing carbon, sulphur and sodium chloride?
18. How will you separate the components of air?
Answers
Explanation:
ans15:PROCESS INVOLVE - Sublimation. Due to Sublimation, iodine and sodium chloride will change into gas and sand will be separated out.
ans16:Gunpowder is a mixture of sulphur, charcoal and potassium nitrate. When water is added to the mixture, potassium nitrate dissolves. The mixture is then filtered. The filtrate is potassium nitrate solution while the residue is a mixture of sulphur and charcoal.
ans17:The mixture of carbon and sulphur can be separated from each other by using a solution of carbon disulphide. ... This mixture is then filtered to remove carbon followed by evaporation to obtain sulphur.
ans18:Pure gases can be separated from air by first cooling it until it liquefies, then selectively distilling the components at their various boiling temperatures. The process can produce high purity gases but is energy-intensive.
Answer:
15. The process of seperating iodine ,sand and sodium chloride involves two steps :
Step 1 : SUBLIMATION OF IODINE
since iodine sublimes on heating a mixture , the iodine vapours can be condensed and collected separately .
Step 2: Now NaCl and sand are left. this can be easily done using water , since NaCl is soluble in water while Sand is not.
this will leave sand behind when mixture is dissolved in water.
16. Gunpowder is a mixture of sulphur, charcoal and potassium nitrate. When water is added to the mixture, potassium nitrate dissolves. The mixture is then filtered. The filtrate is potassium nitrate solution while the residue is a mixture of sulphur and charcoal.
17. The mixture of carbon and sulphur can be separated from each other by using a solution of carbon disulphide. This mixture is then filtered to remove carbon followed by evaporation to obtain sulphur.
18. Pure gases can be separated from air by first cooling it until it liquefies, then selectively distilling the components at their various boiling temperatures. The process can produce high purity gases but is energy intensive