Download ZnSo4 CuSo4 Zn Cu

HIGHER SECONDARY EXAMINATIONMODEL QUESTION PAPER
HSE-II CHEMISTRY Max Marks:60
Time : 2hrs
General Instruction to the candidate
· There is a cool off time of 15 minutes in addition to the writing time of 2 hrs
· Use cool off time to get familiar with question and to plan your answer
· All questions are compulsory
· Give equation wherever necessary
1. In three dimensional close packing, the empty space left between the constituent particles is
called a void.
(a) Explain the different types of voids found in three dimensional close packing.
(2)
(b) A Cubic solid is made of two elements P and Q atoms of P are at the corners of the cube
and Q at the edge centre and body centre. What is the formula?
(2)
2. Two liquids A and B are mixed and the resulting solution is found to be cooler.
a. Is the resultant solutions ideal? Justify.
(1½)
b. Give an example for this type of solution
(1½)
c. Draw the vapour pressure – composition curve for the above type of solution
(2)
3.
→
Zn
CuSo4
Cu
ZnSo4
a. Point out the mistakes that you have noticed in the galvanic cell given above.
(1)
b. Write down the correct representation of the above cell.
(1)
c. Calculate the emf of the following cell at 298 K, where the cell reaction is Zn+Cd2+ →Zn2+ +
Cd
E 0 Zn 2 + / Zn = 0 -. 76 v iE 0 cd 2 + / Cd = - 0. 4v [ Zn 2 + ] = 0 .01m [cd 2 + ] = 0 .1m (2)
4. a) What are the differences between order and molecularity. (2)
b) Half life period of a radioactive element is 100s. How much time will it take for 90% of its
decay. (2)
5. (a) Alums are used to purify water . Give reason. (1)
(b) A synthetic zeolite ZSM -5 converts alcohol to gasoline. Comment on the activity of
zeolites .(2)
6. (a)Ni (s) + 4CO→ Ni(CO)4→ Ni + 4CO .
Name the above purification of Nickel. (1)
(b)Semiconductor grade silicon is obtained by zone refining. Describe the process. (2)
7. (a) Account for the following .
i. Nitrogen does not form penta halides.
ii. Acid strength varies in the order.HF < HCl < HBr < HI (2)
(b)BiH3 is the strongest reducing agent among the hydrides of group 15. (1)
(c)Write the condition for maximise the yield of H2SO4 by contact process. (2)
8. (a)K2Cr2O7 is a powerful oxidizing agent.
Write its oxidizing action with (i) H2S. (ii) Iron(II) sulphate solution. (2)
(b)Lists of transition metal ions are given.
Ti2+, Cr2+, Mn2+.
i. Calculate the number of unpaired electrons in them. (1½)
ii. Select the ion having most magnetic moment. (1/2 )
9. a) IUPAC recommended rules for naming a co-ordination compounds.
Name the following co-ordination compounds
1) K3[Cr(C2O4)3] (1)
b) Distinguish between bidentate and ambidentate ligands with example (2)
c) What is Wilkinson catalyst. Give its use (1)
10. a) Considering the pairs (CH3)3CBr and CH3Br which will follow SN1 and
SN2 reaction.. Explain (2)
b) Why is chloroform stored in dark brown bottles. (1)
c) What are the reagents and the conditions applied for the conversion of Aniline
to benzene diazonium chloride (1)
11. a) How will you distinguish 1 and 2 and 3 alcohols using Lucas reagent (2)
b) Phenol is more acidic than alcohol . Give reason (2)
12. a. Give reason for the following observations.
i) Aldehydes and ketones undergo necleophilic addition reactions.
ii) Acetic acid is weaker than formic acid
(1)
b. Give one test to distinguish acetaldehyde from benzaldehyde
c. CH3 CHO dil NaOH
C6H5 COCH3
A
heat
(1)
(1)
B
C
Identify A, B, & C
(1)
13. Compare the basicity of alkylamines,
(1½)
a. Arylamines and ammonia. Explain
b. How will you convert aniline to benzene
(1½)
14. a. What is meant by inversion of sugar?
(2)
b. Aminoacids can from Zwilter ions. Why?
(1)
15. Given below are a few polymers
a. PVC, Nylon-6, 6, Buna – N
Classify them into addition and condensation polymer
b. Write the monomers for the above polymers
16. a. What are antibiotics? Give an eg:
(1½)
(1½)
b. Write any one use of the following
drug, Ranitidine, Paracetamol
(1½)
(1½)