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IIT-JEE-Chemistry-Paper1-2007
Paper 1
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Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 × 1023) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept.
A 4.0 molar aqueous solution of NaCI is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass: Na = 23, Hg = 200; 1 Faraday = 96500 coulombs).
17. The total number of moles of chlorine gas evolved is
(A) 0.5
(B) 1.0
(C) 2.0
(D) 3.0
18. If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is
(A) 200
(B) 225
(C) 400
(D) 446
19. The total charge (coulombs required for complete electrolysis is
(A) 24125
(B) 48250
(C) 96500
(D) 19300
20. Match the complexes in Column I with their properties listed in Column II.
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Column I
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Column II
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(A)
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[Co(NH3)4(H2O)2]CI2
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(p)
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geometrical isomers
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(B)
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[Pt(NH3)2CI2]
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(q)
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paramagnetic
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(C)
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[Co(H2O)5CI]CI
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(r)
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diamagnetic
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(D)
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[Ni(H2O)6]CI2
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(s)
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metal ion with +2 oxidation state
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21. Match the chemical substances in Column I with type of polymers/type of bonds in Column II.
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Column I
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Column II
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(A)
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Cellulose
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(p)
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Natural polymers
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(B)
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Nylon-6, 6
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(q)
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Synthetic polymer
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(C)
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Protein
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(r)
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Amide linkage
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(D)
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Sucrose
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(s)
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Glycoside linkage
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22. match gases under specified conditions listed in Column I with the properties/laws in Column II.
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Column I
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Column II
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(A)
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Hydrogen gas (P-200 atm, T=273 K)
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(p)
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Compressibility factor ¹ 1
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(B)
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Hydrogen gas (P ~ 0, T=273 K)
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(q)
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Attractive forces are dominant
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(C)
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CO2 (P = 1 atm, T = 273 K)
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(r)
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PV = nRT
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(D)
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Real gas with very large molar volume
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(s)
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P(V - nb) = nRT
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