A-Level Chemistry Question Analysis Topic: Chemistry - Short Questions
Exam Questions:
1) (i) Which one of the following is a polysaccharide: Starch, maltose, fructose, glucose,
(ii) Write one difference between α− helix and β− pleated sheet structures of protein.
(iii) Write the name of the disease caused by the deficiency of vitamin B12.
2) Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal sol? Give reason.
Answers:
For A-Level Chemistry, you should know:
1) (i) Among the four, starch is the polysaccharide as it ccontains more than one sugar unit.
(ii) α-helix is a rod-type structured protein, while β-helix has a sheet-like structure.
(iii) The disease caused by such a deficiency is called pernicious anaemia.
2) In accordance with the Hardy-Schulze rule, the greater a flocculating ion's valency, the greater its power to cause precipitation. Between Ba2+ (from BaCl2) and K+ (from KCl), the former has a higher valency. As such, BaCl2 is more effective in coagulation of a negatively charged colloidal sol.
Work hard for your A-Level Chemistry examination!
End of analysis. Great!
