1. Xtra Edge February 2012 - Career Point

maximum kinetic energy of electrons emitted from
this surface ?
30. With the help of a neat and labelled diagram, explain
the underlying principle and working of a moving
coil galvanometer. What is the function of:
(i) uniform radial field
(ii) soft iron core in such a device ?
OR
Derive a mathematical expression for the force per
unit length experienced by each of the two long
current carrying conductors placed parallel to each
other in air. Hence define one ampere of current.
Explain why two parallel straight conductors carrying
current in the opposite direction kept near each other in
air repel ?
CHEMISTRY
1. Complete the following reactions :
CH3–CH2–CH=CH2 + HCl → ………….
2. Arrange the following compounds in an increasing
order of their acid strengths :
(i) Br2 – CH2 – CH2 – COOH
(ii) Cl – CH – CH2 – COOH
|
Cl
(iii) F – CH2 – CH2 – COOH
(iv) CH2 – CH2 – COOH
|
I
3. How will you distinguish between propanal &
propanone.
4. What are amino acid. Write zwitterionic structure of
alanine.
5. What happen when an electric field is applied to a
colloidal solution ?
6. Explain the Frenkel defect with suitable example.
7. Why is the elevation in b.p. of water different in the
following solutions ?
(i) 0.1 molar NaCl solution.
(ii) 0.1 molar sugar solution.
8. Write a IUPAC name of following :
CH3 – CH – C – C – OCH3
Br O O
9. Complete the following reaction sequense :
(i) C6H5N2Cl + Cu2Cl2 ⎯⎯→ ∆
……………
(ii) HC ≡ CH
Hg−SO4 ⎯ ⎯
H2SO4
⎯ →
..................
10. For the following conversion reactions write the
chemical equations :
(i) Ethyl isocyanide to ethylamine
(ii) Aniline to N-Phenylethanamide
11. Write the structural formulae of A, B, C and D in the
following sequence of reaction :
A + CH3MgBr H2O CH3CH2 – CH – CH3
OH
XtraEdge for IIT-JEE 70 FEBRUARY 2012
D
Alc. KOH
C
Br2
B
–H2O
H2SO4
12. Give the structural formulae and names of the
products of the following reactions :
(i) Chloroform is heated with aniline in presence of
alc. KOH.
(ii) Phenol is treated with an excess of aqueous
bromine.
13. For a I st order chemical reaction rate constant is
2.303 sec –1 . Determine the time required for 90%
completion of a chemical reaction
14. The vapour pressure of pure liquid A and B are 450
mm Hg and 700 mm Hg at 350 K respectively. Find
the mole fractions of the components if total vapour
pressure is 600 mm Hg.
15. Calculate the mass of a nonvolatile solute (molecular
mass 40) which should be dissolved in 114 g octane
to reduce its vaour pressure to 80%.
16. Describe the following with an example for each :
(i) Aldol condensation
(ii) Trans-esterification
17. Write reactions starting conditions for the following
conversions :
(i) Benzene to Acetophenone
(ii) Ethanal to Propanone
18. (a) Compare the magnetic moments of the following
Cr +3 , V +3 , Fe +3
(b) Which of the following is coloured
CuSO4(aq), [Sc(H2O)6] +3 , ZnCl2
19. How are the following conversions carried out ?
(Write reactions only)
(i) 1-bromopropane to 2-bromopropane
(ii) Propanone to iodoform
(iii) Phenol to salicylic acid
20. Describe in brief the structure of DNA.
21. Write the structure of polymers :
(a) PVC (b) PMMA (C) PTFE
22. What are antacids. Explain with example
23. What is adsorption ? How does adsorption of a gas
on a solid surface vary with