IIT-JEE-Chemistry-Screening–2000

SCREENING

Time : Three hours                                                             Max. Marks : 100 
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1. For the electrochemical cell, M|M+||X–|X, Eo (M+|M) = 0.44V and Eo 
(X|X–) = 0.33 V. From this data one can deduce that: 
(A) M + X ® M+ + X– is the spontaneous reaction. 
(B) M+ + X– ® M + X is the spontaneous reaction. 
(C) Ecell = 0.77V 
(D) Ecell = –0.7 V 

2. The DfHo for CO2(g), CO(g) and H2O(g) are –393.5, –110.5 and –241.8 kJ mol–1respectively. The standard enthalpy change (in kJ mol–1) for the reaction CO2(g) + H2(g) ® CO(g) + H2O(g) is:

(A) 524.1                                 (B) 41.2 
(C) –262.5                               (D) –41.2 

3. The number of P — O — P bonds in cyclic metaphosphoric acid is: 
(A) zero                                  (B) two 
(C) three                                (D) four 

4. The chemical processes in the production of steel from haematite ore involve: 
(A) reduction 
(B) oxidation 
(C) reduction followed by oxidation 
(D) oxidation followed by reduction 

5. Which of the following has the highest nucleophilicity: 
(A) F–                                    (B) OH– 
(C) CH3-                                 (D) NH2- 

6. The order of reactivities of the following alkyl halides for a SN2 reaction is: 
(A) RF > RCI > RBr > RI            (B) RF > RBr > RCI > RI 
(C) RCI > RBr > RF > RI            (D) RI > RBr > RCI > therefore 

7. The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d5 4s1. 
This represents its: 
(A) excited state                   (B) ground state 
(C) cationic form                   (D) anionic form 

8. The correct order of acidic strength is: 
(A) CI2O7> SO2 > P4O10       (B) CO2 > N2O5> SO3
(C) Na2O > MgO > AI2O3       (D) K2O > CaO > MgO 

9. Which of the following, has the most acidic hydrogen: 
(A) 3–hexanone                 (B) 2, 4-hexanedione 
(C) 2, 5-hexanedione          (D) 2, 3-hexanedione 

10. Benzoyl chloride is prepared from benzoic acid by: 
(A) CI2, hv                      (B) SO2CI2 
(C) SOCI2                       (D) CI2, H2O 

11. Which one of the following alkenes will react fastest with H2 under catalytic hydrogenation condition : 

    

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