CLASS 12 HALF YEARLY HOLIDAY HOME WORK

SOLVE THE SAMPLE PAPER

1.      Write the structure of 1-chloro-2, 2-dimethylpropane.

2.      What is the effect of presence of Schottky defects on the density of the crystal?

3.      If a compound is formed by the elements X and Y crystallises in the cubic arrangement with X atoms at the corners of a cube and Y atoms at face centres, then give its formula of the compound?

4.      Give any two main functions of hormone adrenaline.

5.      Define co-enzyme.

6.      Give reasons:

(i)  Phenol has higher boiling point than toluene.

(ii)  Unlike phenols, alcohols are easily protonated.

7.      Write a note on:

(i)  Hoffmann  bromamide reaction

8.      (i) Define co-ordination number.

     (ii) Give the co-ordination number of atoms in ccp and bcc structures.

9.   If three elements A, B and C crystallize in a cubic solid with A atoms at the corners, B atoms at          the cube centres and C atoms at the faces of the cube, then give the formula of the compound. 10.      An organic compound having molecular formula C8H18 on monochlorination gives a single                  monochloride. Write the structure of the hydrocarbon.

11.  Comment: Raoult’s law as a special case of Henry’s Law.

12.  What are the forces that stabilize the protein structures?

13.  Complete the reactions:

(i)  POCl3 + H2O €

(ii)  P4O10 + H2O €

(iii)  P4 + KOH+ H2O €

14.  Define the following term with an example:

(a)  Tranquilizers

(b)  Analgesics

(c)  Antipyretics

15  Explain the term copolymerisation with two examples.

16.  Give four criterions to be followed for the selection of stationary phase in chromatography.

17.  (i) Define chelation.

(ii)  What is meant by chelating ligand?

(iii)  What is denticity?

18.  What are cationic complex, anionic complex and neutral complex? Give examples.

19.   

(a)  Define the term ‘chemotherapy’.

(b)  Name the macromolecules that are chosen as drug targets.

20.  What are the three ways to control the microbial diseases?

21.  Explain pseudo first order reaction with an appropriate example.

22  Explain the term:

(a)  Electro-osmosis

(b)  Coagulation

23.  Give the name of the reagents to bring the following conversions:

(a)  Allyl alcohol to propenal

(b)  But-2-ene to ethanol

(c)  Cyclohexanol  to cyclohexanone

(d)  Ethanenitrile to ethanol

(e)  Hexan-1-ol to hexanal

24.  (a) Give the important advantages of fuel cells over ordinary batteries.

       (b) Define molar conductivity and equivalent conductivity.

25. (a)  Represent the cell in which the following reaction takes place Mg(s) + 2Ag+(0.0001M)

€Mg2+(0.130M) + 2Ag(s). Calculate its E(cell), if (cell) Eϴcell= 3.17    V.

(b)  Calculate the equilibrium constant of the reaction: Cu(s) + 2Ag+(aq) €Cu2+(aq) + 2Ag(s), if Eϴcell= 0.46 V.

26.  (a) The standard electrode potential for Daniell cell is 1.1V. Calculate the standard Gibbs energy for the reaction: Zn(s) + Cu2+(aq) €Zn2+(aq) + Cu(s)

(b) If the limiting molar conductivities for Nacl, HCl and NaAc are 126.4, 425.9 and 91.0 S cm2/mol respectively, then calculate ᴧ0 for HAc.

(c)  The conductivity of 0.001028 mol/L acetic acid is 4.95 x 10-5 S/cm. calculate its dissociation constant if the limiting molar conductivity for acetic acid is 390.5 S cm2/mol.

(d)  Give a short not on nickel – cadmium cell. Give its overall reaction during discharge.