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–1
respectively. 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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