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for carbon ion 
 
Stability order will be

1.  P > Q > S > R

2.  P > R > Q > S

3.  Q > R > S > R

4.  S > R > Q > P

 59%
Level 3: 35%-60%
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The aqueous solution of an unknown sodium salt gives the following reactions. 
I. It decolorizes a solution of iodine in potassium iodide. 
II. It gives white turbidity with dil. HCl solution. 
III. It gives a white precipitate with AgN03 solution which changes colours and finally becomes black on standing. 
The unknown sodium salt is

1.  Sodium thiosulphate

2.  Sodium bisulphite

3.  Sodium sulphite

4.  Sodium sulphide

 55%
Level 3: 35%-60%
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The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJ mol-1) of C-C, Si-Si and Ge-Ge bonds respectively are

1.  348, 167, 180

2.  348, 180, 167

3.  167, 180, 348

4.  180, 167, 348

 62%
Level 2: 60%+
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What is correct about the following structure? 

1.  Total stereoisomers = 4

2.  Number of chiral carbons= 1

3.  Number of optical isomers= 2

4.  Number of meso compounds= 2

 52%
Level 3: 35%-60%
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Number of oxygen atoms shared per SiO44- Tetrahedron in 
I. Two dimensional sheet structured silicates 
II. Cyclic silicates and 
III. Single strand chain silicates respectively are

1.  3, 3, 2

2.  3, 2, 2

3.  4, 3, 1

4.  4, 3, 2

 55%
Level 3: 35%-60%
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Which of the following is the most primitive ancestor of man?

1.  Ramapithecus

2.  Homo habilis

3.  Australopithecus

4.  Homo sapiens neanderthalensis

 68%
Level 2: 60%+
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Vitamin-B12 is absorbed primarily in the

1.  Stomach

2.  duodenum

3.  Jejunum

4.  ileum

Level 4: Below 35%
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The faster breathing in high fever is due to the

1.  Additional requirement of 02 for the invader germs

2.  High temperature of the body

3.  Mental worry of a patient

4.  Loss of appetite

 58%
Level 3: 35%-60%
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Which of the following animals possess non-elastic lungs with elastic air sacs connected to them?

1.  Reptiles

2.  Birds

3.  Amphibians

4.  Mammals

 64%
Level 2: 60%+
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Which of the following is not correctly matched?

1.  Trichomonas vaginalis - Leishmaniasis

2.  Glossina palpalis- Sleeping sickness

3.  Aedes aegypti- Yellow fever

4.  Culex pipiens- Filariasis

Level 3: 35%-60%
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