Calicut University 2008 C.A Chartered Accountant 12th cbse board - Question Paper

(i) C?H?N?Cl + KI ?


(ii) H H
C=C +Br? CCl?
H H


16. write 1 chemical reaction every to illustrate the following:
(i) Hofmann’s bromamide reaction
(ii) Gabriel phthalimide synthesis
17. (i) organize the subsequent in an increasing order of basic strength in water:
C?H?NH?, (C?H?)?NH, (C?H?)?N and NH?
(ii) organize the subsequent in increasing order of basic strength in gas phase:
C?H?NH?, (C?H?)?NH, (C?H?)?N and CH?NH?
18. elaborate thermoplastic and thermosetting polymers?give 1 example of every.
19. Silver crystallizes in an fcc lattice. The edge length of its unit cell is 4.007x10?? cm and its density is 10.5 gm cm??. compute on the basis the atomic mass of silver.(N?=6.02x10?? mol??)
20. A solution containing 8g of a substance in 100g of diethyl ether boils at 36.86?C, where as pure ether boils at 35.60?C. determine the molecular mass of the solute. (For ether KT=2.02 K Kg mol??)
Or
compute the temperature at which a solution containing 54g of glucose, C?H??O?, in 250gm of water will freeze. [K? for water = 1.86 K kg mol??]
21. discuss what is observed when
(i) KCl, an electrolyte, is added to hydrated ferric oxide sol,
(ii) An electric current is passed through a colloidal solution,
(iii) A beam of light is passed through a colloidal solution.
22. What chemical principle is involved in choosing a reducing agent for getting the metal from its oxide ore? Consider the metal oxides, Al?O? and Fe?O?, and justify the option of reducing agent in every case.
23. how would you account for the subsequent situations?
(i) the transition metals generally form coloured compounds.
(ii) With 3d? configuration, Cr?? acts as a reducing agent but Mn?? acts as an oxidizing agent.(Atomic masses, Cr=24, Mn=25)
(iii) The actinoids exhibit a larger number of oxidation states than the corresponding lanthanoids.
24. (a) what is the basis of formation of the spectro-chemical series?
(b) draw the structures of geometrical isomers of the subsequent coordination complex:
[Co(NH?)?Cl?] and [CoCl?(en)?]?
25. (a) name the reagents and write the chemical equations for the preparation of the subsequent compounds by Williamson’s synthesis:
(i) ethoxybenzene
(ii) 2-Methyl-2-methoxypropane
(b) why do phenols not provide the protonation reaction readily?
26. what happens when D-glucose is treated with the subsequent reagents?
(i) HI
(ii) Bromine water
(iii) HNO?
27. mention 1 use for every of the subsequent drugs:
(i) Ranitidine
(ii) Paracetamol
(iii) Tincture of iodine
28. (a) derive the general expression for half-life of a 1st order reaction.
(b) the decomposition of NH? on platinum surface is a zero order reaction. What would be rates of production of N? and H? if k=2.5x10?? mol?? Ls???
Or
(a) list the factors that determine the rate of a chemical reaction.
(b) The half-life for decay of radioactive ??C is 5730 years. As archaeological artefact containing wood had only 80% of the ??C activity as obtained in a residing tree. compute the age of the artifact.
29. Assign reasons for the following:
(i) sulphur vapour is magnetic.
(ii) Ammonia (NH?) has greater affinity for protons than phosphine (PH?).
(iii) The negative value of electron gain enthalpy of fluorine is less than that of chlorine.
(iv) SF? is much less reactive than SF?.
(v) Of the noble gases only xenon is known to form well-established chemical compounds.
Or
(a) define the favourable conditions for the manufacture of
(i) Ammonia by Haber’s process, and
(ii) Sulphuric acid by contact process
(b) draw the structures of the following:
(i) PCl? (g)
(ii) S? (g)
(iii) CIF? (g)
30. (a) giving a chemical formula for each, illustrate the subsequent processes:
(i) Cannizzaro reaction
(ii) Acetylation
(iv) Decarboxylation
(b) State chemical tests to distinguish ranging from the subsequent pairs of compounds:
(i) Propanal and Propanone
(ii) Phenol and Benzoic acid
Or
(a) an organic compound A containing 69.77% carbon, 11.63% hydrogen and the rest is oxygen. The molecular mass of the compound is 86. it does not decrease Tollen’s reagents but forms an addition procuct with sodium hydrogen sulphite and provide positive iodoform test. On vigorous oxidation it provide ethanoic and propanoic acids. Write the possible structures of the compounds A.
(b) write the chemical tests to distinguish ranging from the subsequent pairs of compounds:
(i) Acetophenone and benzophenone
(ii) Ethanal and propanal

Earning:   Approval pending.