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  #1  
7th August 2014, 10:45 AM
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IIT JEE Last 2 Year Papers

Will you please provide me solved question paper for IIT Joint entrance examination in a PDF file format ?
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  #2  
7th August 2014, 01:30 PM
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Join Date: Apr 2013
Re: IIT JEE Last 2 Year Papers

Here I am giving you solved question paper for IIT Joint entrance examination in a PDF file attached with it so you can get it easily.

1. The Henry’s law constant for the solubility of N2 gas in water at 298 K is 1.0 × 105 atm. The mole fraction
of N2 in air is 0.8. The number of moles of N2 from air dissolved in 10 moles of water at 298 K and 5 atm
pressure is
(A) 4.0 × 10−4 (B) 4.0 × 10−5
(C) 5.0 × 10−4 (D) 4.0 × 10−6
Sol. (A)

3. The reaction of P4 with X leads selectively to P4O6. The X is
(A) Dry O2 (B) A mixture of O2 and N2
(C) Moist O2 (D) O2 in the presence of aqueous NaOH
Sol. (B)
P4 + 3O2 2 N → P4O6 (exclusively)
(N2 is used to retard the further oxidation.)

4. Among cellulose, poly(vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular
force of attraction is weakest is
(A) Nylon (B) Poly(vinyl chloride)
(C) Cellulose (D) Natural Rubber
Sol. (D)
As chain of natural rubber involves weak van der Waal force of interaction.

5. Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5% respectively, the atomic
mass of Fe is
(A) 55.85 (B) 55.95
(C) 55.75 (D) 56.05
Sol. (B)

6. The IUPAC name of the following compound is
OH
CN
Br
(A) 4-Bromo-3-cyanophenol (B) 2-Bromo-5-hydroxybenzonitrile
(C) 2-Cyano-4-hydroxybromobenzene (D) 6-Bromo-3-hdyroxybenzonitrile
Sol. (B)
Priority of CN is highest.

7. Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for
Sb2S3 sol is
(A) Na2SO4 (B) CaCl2
(C) Al2(SO4)3 (D) NH4Cl
Sol. (C)
As Sb2S3 is a negative sol, so, Al2(SO4)3 will be the most effective coagulant due to higher charge density
on Al3+ in accordance with Hardy-Schulze rule.
Order of effectiveness of cations: Al3+ > Ca++ > Na+ > 4 NH+





Attached Files
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