IIT JEE Question Paper

Hello sir I have applied for Indian Institute of Technology (IIT) joint entrance exam (JEE) 2012. Now its study time, so I am looking for model question paper for preparation in IIT JEE. Can you provide me Indian Institute of Technology (IIT) joint entrance exam (JEE) question paper?

I want last 5 year questions paper of JCECE of all subject. ( Jharkhand Combined Entrance Competitive Exam.)

here I am giving you question paper for Joint entrance examination organizes by IIT colleges situated in PDF file with it so you can get it easily…

Some content is given below :
PART A −CHEMISTRY
1. An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary,
secondary or tertiary. Which alcohol reacts fastest and by what mechanism:
(1) tertiary alcohol by SN1 (2) secondary alcohol by SN2
(3) tertiary alcohol by SN2 (4) secondary alcohol by SN1

Sol. (1)
Reaction proceeds through carbocation formation as 30 carbocation is highly stable, hence reaction proceeds
through SN1 with 30 alcohol.

2. The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:
(1) – 5.1 eV (3) –10.2 eV
(3) + 2.55 eV (4) – 2.55 eV

5. Which of the following is the wrong statement?
(1) O3 molecule is bent (2) Ozone is violet-black in solid state
(3) Ozone is diamagnetic gas (4) ONCl and ONO–
are not isoelectronic

9. How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an
aqueous solution with pH of 2?
(1) 0.9 L (2) 2.0 L
(3) 9.0 L (4) 0.1 L
Sol. (3)
Initial pH = 1, i.e. [H+] = 0.1 mole/litre
New pH = 2, i.e. [H+] = 0.01 mole/litre
In case of dilution: M1V1 = M2V2
0.1 ×1 =0.01 × V2
V2 = 10 litre.
Volume of water added = 9 litre.

10. Which one of the following molecules is expected to exhibit diamagnetic behaviour?
(1) N2 (2) O2
(3) S2 (4) C2
Sol. (1) & (4) both are correct answers.
N2 Diamagnetic
O2 Paramagnetic
S2 Paramagnetic

11. Which of the following arrangements does not represent the correct order of the property stated against it ?
(1) Ni2+ < Co2+ < Fe2+ < Mn2+ : ionic size
(2) Co3+ < Fe3+ < Cr3+ < Sc3+ : stability in aqueous solution
(3) Sc < Ti < Cr < Mn : number of oxidation states
(4) V2+ < Cr2+ < Mn2+ < Fe2+ : paramagnetic behaviour

Sol. (2) & (4) both are correct answers)
The exothermic hydration enthalpies of the given trivalent cations are:
Sc+3 = 3960 kJ/mole
Fe+3 = 4429 kJ/mole
Co+3 = 4653 kJ/mole
Cr+3 = 4563 kJ/mole
Hence Sc+3 is least hydrated; so least stable (not most stable)
Fe+2 contains 4 unpaired electrons where as Mn+2 contains 5 unpaired electrons hence (4) is incorre

12. Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in
its oxide. Fraction of the metal which exists as M3+ would be:
(1) 4.08% (2) 6.05%
(3) 5.08% (4) 7.01%

13. A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass
390. The number of amino groups present per molecule of the former compound is:
(1) 5 (2) 4
(3) 6 (4) 2

16. The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such
a reaction will be:
(R = 8.314 JK–1 mol–1 and log 2 = 0.301)
(1) 48.6 kJ mol–1 (2) 58.5 kJ mol–1
(3) 60.5 kJ mol–1 (4) 53.6 kJ mol–1

17. Synthesis of each molecule of glucose in photosynthesis involves:
(1) 10 molecules of ATP (2) 8 molecules of ATP
(3) 6 molecules of ATP (4) 18 molecules of ATP

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