IIT-JEE-Chemistry-Screening–2001

Screening

Time : Two hours                                                               Max. Marks : 100 
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Instructions 
Use the values of the constants as given below: 
Planck’s constant, h = 6.626 x 10-34 Js 
Atomic Numbers: Cr = 24, Mn =25, Fe = 26, Co=27, Pt=78 

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1. In thermodynamics, a process is called reversible when: 
(a) Surroundings and system change into each other 
(b) There is no boundary between system and surroundings 
(c) The surroundings are always in equilibrium with the system 
(d) The system changes into the surroundings spontaneously 

2. The root mean square velocity of an ideal gas at constant pressure varies with density (d) as : 
(a) d2 
(b) d 
(c) √d 
(d) 1/√d 

3. In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is: 
(a) AB2 
(b) A2B 
(c) A4B3 
(d) A3B4 

4. The wavelength associated with a golf ball weighing 200g and moving at a speed of 5 m/h is of the order : 
(a) 10-10m 
(c) 10-20m 
(d) 10-30m 
(e) 10-40m 

5. Hydrogenation of the adjoining compound in the presence of poisoned palladium catalyst gives : 

                   
(a) An optically active compound 
(b) An optically inactive compound 
(c) A racemic mixture
(d) A diastereomeric mixture 

6. 1-Propanol and 2-Propanol can be best distinguished by : 
(a) Oxidation with alkaline KMnO4 followed by reaction with Fehling solution 
(b) Oxidation with acidic dichromate followed by reaction with Fehling solution 
(c) Oxidation by heating with copper followed by reaction with Fehling solution 
(d) Oxidation with concentrated H2SO4 followed by reaction with Fehling solution 

7. The reaction of propene with HOCl proceeds via the addition of : 
(a) H+ in the first step 
(b) Cl+ in the first step 
(c) OH- in the first step 
(d) Cl+ and OH- single step 

8. An SN2 reaction at an asymmetric carbon of a compound always gives : 
(a) An enantiomer of the substrate 
(b) A product with opposite optical rotation 
(c) A mixture of diastereomers 
(d) A single steroisomer 

9. The quantum numbers +1/2 and -1/2 for the electron spin represent : 
(a) Rotation of the electron in clockwise and anticlockwise direction respectively 
(b) Rotation of the electron in anticlockwise and clockwise direction respectively 
(c) Magnetic moment of the electron pointing up and down respectively 
(d) Two quantum mechanical spin states which have no classical analogue 

10. Which one of the following statements is false : 
(a) Work is state function 
(b) Temperature is a state function 
(c) Change in the state is completely defined when the initial and final stated are specified 
(d) Work appears at the boundary of the system 

11. An aqueous solution of 6.3 g oxalic acid dehydrate is made up to 250ml> the volume of 0.1N NaOH required to completely neutralize 10ml of this solution is : 
(a) 40ml 
(b) 20ml 
(c) 10ml 
(d) 4ml

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