CBSE Guess > Papers > Question Papers > Class XII > 2005 > Chemistry > Delhi Set-III

CHEMISTRY 2005 (Set-III Delhi)

Except for the following questions, all the remaining questions have been asked in Set I and Set II.

Q. 12. Write the names and structures of the monomers used for getting the following polymers: 2

(i) PVC

(ii) PMMA

Q. 18. What are the two classes of emulsions? Give one example of each class State one activity to test the type of an emulsion. 3

Q. 23. The radioactive isotope Co can be made by both an (n, p) and an (n, ) reaction For each reaction indicate the appropriate target nucleus If the half-life of Co is 7 years, calculate the dacay constant for it. 3

Q. 24. What are carbon fibres and what properties make them specially useful? Write two uses of carbon fibres. 3

Q. 26. (a) Assign a reason for each of the following statements:

(i) Unlike In⁺ TI⁺ is stable with respect to disproportionation reaction:

(ii) Pérehioric acid is a stronger acid than sulphuric acid.

(iii) Of all the noble gases only Xenon is known to form established chemi cal compounds.

(b) Write the structural formulae for the following: 3, 2

(i) SF₄

(ii) XeO₃

Or

 (a) Assign a reason for each of the following statements:

(i) Anhydrous AICI₃ acts as a catalyst in many organic reactions.

(ii) All the bonds in a molecule of PCI₅ are not equal.

(iii) Hydrogen fluoride is a weaker acid than hydrogen chloride in aqueous solution.

(b) Write structure of the following molecules:

(i) IF₅

(ii) XeOF₃

Q. 27. (a) How are the lipids classified? Give one example of each class.

(b) Name the deficiency diseases resulting from lack of Vitamins A and E in the diet. 5

Or

(a) Define vitamins and state their classification. List two vitamins of each class.

(b) What are enzymes? State the activity of an enzyme.

Chemistry 2005 Question Papers Class XII
Delhi		Outside Delhi
	Set I		Set I
	Set II		Set II
	Set III		Set III

CBSE 2005 Question Papers Class XII
	English		Sociology
	Functional English		Psychology
	Mathematics		Philosopy
	Physics		Computer Science
	Chemistry		Entrepreneurship
	Biology		Informatics Practices
	Geography		Multimedia & Web Technology
	Economics		Biotechnology
	Business Studies		Physical Education
	Accountancy		Fine Arts
	Political Science		History
	Agriculture