Thursday, December 30, 2010

SCEINCE COLLEGE
  Paper      chemistry       2nd year      (objective) Time 20min Total marks 34
Multiple choice questions.     
Melting and boiling points of halogens are increased.A above the group
B   down the group C   from left to right periods D     from right to left periods
11.  Mark the correct statement. A. cl     ions and cl atoms are Equal   in size.B Na + is large than NA   atom.C        Na+ is smaller that Na atom,
D   cal+ is smaller than cl atom.
111.  Na→na + + e- A i=738kjmol-1      B     i=1451 kj mol-1C i= 496 kjmol-1    D i= 8114 kjmol-1
1v.Remo0val of ectetron is known as A reduction   B   oxidation C  absorption     D  b and a.
V. the period ………..and ……….are called long period.A  3 and  4  B  4 and 5 C  1  and  6  D  7and 8
V1.  2Na +2H2o→H 2 +   ? A  Na2oH   B   NaoH2 C 2Na oH   D 2(Noah) V11. Whose elements are called transition elements? A d and y block B     pand s-block     C s  and   y block   D   d  and s   block
V111 keeping in view the size of atoms, which order is the correct one.
A  mg   >5r   B    ba>mg c   Lu>  C  e   D  >i
1x. sp3     B sp 2    C 5p    D dsp3
X. in l-butyl alcohol, the tertiary carbonm is bonded to A two  hydrogen atoms  B   three hydrogen atom.C.  one hydrogen atom.D  no hydrogen atom x1.which  set of hybrid orbitas has planer triangular shape.A  sp 3 B  sp   C   sp 2  D   dsp2
X11.  select from the following the one which is alcohol.
A  ch3----ch2-----oh   B  ch3------o----ch3  C CH3COOH D ch3 –ch2----br
X111. Ether show the phenomenon of A   position isomerism B functional group isomerism C metamerism  D   cis-  trans  isomerism
X1v. a double bond consists of  A   two  sigma bonds B  one sigma and one pi bond C  one sigma and two pi bonds  D  two pi bonds
xv.The  PH raqnge of acid rain is.A  7----6.5 B   6.5---6  C  6----5.6  D  less  than   5
Xv1.  Ecosystem is a smaller unit of A lithosphere B   hydrosphere   C atmosphere D bioshere
Xv11.A single chloride free radical can des troy how many ozone molecules.
A  100    B   10, ooo   C  10,oooo D   10
  


SCIENCE COLLEGE
 PAPER CHEMISTRY 2ND YEAR SUBJECTIVE TIME2:30HR    MARKS.  100
Attempt any 22   questions                                                      (44)
1.     How is oil spillage affecting the marine life?
2.     how detergent s are threat to aquatic animal life?
3.     Explain how pesticides are dangerous to human beings?
4.     what are leachets?
5.     what is crude oil?
6.      write the fomula of 2—methylpropane and also define the isomerism .
7.     Define cist trans isomers and also  write their formulas. .
8.     Explain the process of incineration industrial waste?
9.     discuss industrial waste effluents?
10. why is ozone layer depleting?
11. what is orbital  hybridization.
12. how organic compounds are classified.
13. why is ethane  an important industrial chemical?
14. write are homocyclic and  heterocyclic compounds?
15. write a few lines on cracking of hydrocarbons?
16. Explain the importance of WOHLER’S work in the development of organic chemistry ?
17. why the oxidation state of noble gases in usually Zero.
18. why d   and f---block elements are called transition elements.
19. why the oxidation states vary in  a period but remain almost constant in a  group.
20. Why  diamond is a non  conductor  and  graphite is fairly  a good conductor.
21. why ionic character of halides decreases from left to right in  a period.
22. why alkali metal give ionic hydrides.
23. define weed killers.
24. explain lanthanides.
25. Define Knoking and cracking.
ATTEMPT ANY TWO   QUESTIONS   12*2=24
    Q1.what is orbital hybridization? Explain sp3, sp2 and sp modes of hybridization of carbon?
 Q2.  what is smeg? Eplain the pollutants which are the main cause of photochemical?
Q3.  how the classification of clements in different blocks helps in understanding the chemistrt?

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