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      IIT-JEE Screening test

                                           Speedv Model Paper

                                               CHEMISTRY

 

Max Marks: 35                                                                                             Time: 60 min

 

 

1. It is easier to liquify 0₂ than H₂ because
1. 0₂ has very low critical and inversion temperatures
2. 0₂ has higher critical and inversion temperatures
3. 0₂ has higher critical temperature and lower inversion temperature
4. 0₂ has a lower critical temperature and higher inversion temperature

 

2.      The half life period for a first order reaction is 10 min. The time required for the decomposition of 90% of the original compound will be

a. 90 min      b. 71 min      c. 33 min       d. 26 min

 

3. In the salt bridge KCl is used because
1. It is an ionic compound
2. It is an electrolyte
3. It is a good conductor of electricity
4. The transport numbers of K⁺ and Cl^- are same

 

4. ZSM-5 converts

a. Alcohol to petrol            b.Heptane to Toluene

c. Benzene to Toluene      d. Toluene to Benzene

 

5. If 200 MeV of energy is released in the fission of a single nucleus of U-235, how many fissions are must occur per second to produce energy of I KW?

a. 3.2 3 10^-11 /sec              b. 31.25 3 10¹³/sec

c. 31.25310¹² /sec            d. 10000/sec

 

6. Which of the following is not an aromatic species?

a. Benzene                                                   b. Cyclo-octatetraene     

c. Cyclopentadienyl anion                     d. Tropylium cation

 

7. An organic reaction intermediate contains a divalent carbon surrounded by 6 electrons but has no electrical charge. The intermediate is

a. Carbonium ion              b. Carbanion

c. Carbene                          d. Methylene group

 

8. Ethanoic acid is warmed with HN₃ in the presence of conc. H₂SO₄ to give

a. Acetamide         b. Oxamide

c.Ethyl amine          d. Methyl amine

 

9. The reaction involving the following change  is called

 

OH^-

C₆H₅COCOC₆H₅     ---------------à  (C₆H₅)₂C(OH).COOH

            a. ALdol condensation                             b. Benzoin condensation

            c. Benzilic acid rearrangement             d. Hoffmann rearrangement

 

10. Chloretone contains which functional group

a. Aldehyde                        b. acid

c. Ketone                  d. Alcohol