IIT-JEE-Chemistry-Screening–2000

12. The appropriate reagent for the following transformation :

   
(A) Zn(Hg), HCI                    (B) NH2 NH2, OH– 
(C) H2/Ni                             (D) NaBH4 

13. Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out: 
(A) in the presence of NaCI. 
(B) in the presence of fluorite. 
(C) in the presence of cryolite which forms a melt with lower melting temperature. 
(D) in the presence of cryolite which forms a melt with higher melting temperature. 

14. Amongst the following, identify the species with an atom in +6 oxidation state. 
(A) MnO4-                            (B) Cr(CN)63-

(C) NiF62-                             (D) CrO2CI2 

15. For the reversible reaction N2(g) + 3H2(g) = 2NH3(g) at 500oC, the value of Kp is 1.44 × 10-5 when partial pressure is measured in atmospheres. The corresponding value of Kc with concentration in mol L-1 is: 
(A) 1.44 × 10-5/(0,082 × 500)-2             (B) 1.44 × 10-5/(8.314 × 773)-2 
(C) 1.44 × 10-5/(0.082 × 773)2              (D) 1.44 × 10-5/(0.082 × 773)-2 

16. The hybridization of atomic orbitals of nitrogen in NO2+, NO3- and NH4+ are:

(A) sp, sp3 and sp2 respectively            (B) sp, sp2 and sp3 respectively 
(C) sp2, sp and sp3 respectively            (D) sp2, sp3 and sp respectively 

17. Amongst H2O, H2S, H2Se and H2Te, the one with the highest boiling point is: 
(A) H2O because of hydrogen bonding 
(B) H2Te because of higher molecular weight 
(C) H2S because of hydrogen bonding 
(D) H2Se because of lower molecular weight 

18. Which of the following compounds will exhibit geometrical isomerism: 
(A) 1-phenyl-2-butene                       (B) 3-phenyl-1-butene 
(C) 2-phenyl-1-butene                       (D) 1, 1-diphenyl-1-propene 

19. Molecular shapes of SF4, CF4 and XeF4 are: 
(A) the same, with 2, 0 and 1 lone pair of electrons respectively 
(B) the same, with 1, 1 and 1 lone pair of electrons respectively 
(C) different, with 0, 1 and 2 lone pairs of electrons respectively 
(D) different, with 1, 0 and 2 lone pairs of electrons respectively 

20. Among the following, the strongest base is: 
(A) C6H5NH2                                   (B) p – NO2C6H4NH2 
(C) m – NO2 – C6H4NH2                    (D) C6H5CH2NH2 

21. The correct order of radii is: 
(A) N < Be < B                                (B) F– < O2– < N3– 
(C) Na < Li < K                                (D) Fe3+ < Fe2+ < Fe4+ 

22. The number of nodal planes in a px orbital is: 
(A) one                                         (B) two 
(C) three                                       (D) zero 

23. Ammonia can be dried by: 
(A) conc. H2SO4                            (B) P4O10 
(C) CaO                                        (D) anhydrous CaCI2 

24. The rms velocity of hydrogen is √7 times the rms velocity of nitrogen. If T is the temperature of the gas: 
(A) T (H2) = T (N2)                        (B) T (H2) > T (N2) 
(C) T (H2) < T (N2)                        (D) T (H2) = √7 T (N2) 

25. Propyne and propene can be distinguished by: 
(A) conc. H2SO4                          (B) Br2 in CCI4 
(C) dil. KMnO4                             (D) AgNO3 in ammonia

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