1. Xtra Edge February 2012 - Career Point

(iii)
OH
COOH
+
OCOCH3
COOH
Aspirin
CH3CO
CH3CO
O
+ CH3COOH
20. (a) ––CH2–CH=CH2––CH––CH––CH2––
H
H
(b) ––CH2–C––
H
C6H5
(c) ––CH2–CH––
H
CN
C6H5
21. Antibiotics are natural chemicals which kill/stop the
growth
of bacteria
Types –
(A) Bactericidal : Ex- penicillin, afloxacin
(B) Bacteriostatic: Ex tetracycline, chloremphenicol
22. Vitamins are organic compounds required in small
quantity for normal functioning of body
vitamin (C) is ascorbic acid. Deficiency- scurvy
vitamin B1 is thiamine acid. Deficiency – beri-beri
vitamin (B12) is cyanocobalamine. Deficiency anaemia
23 (i) Rate of Reaction Rate constant of Reaction
(ii)
1. It is the speed at
which the reactants
are converted into
the products at any
moment of time
2. It depends upon the
concentration of
reactants species at
that
time.
moment of
3. It generally
decreases with
progress of the
reaction
1. It is the constant of
proportionality in the rate
law equation
2. It refers to the rate of the
reaction at the
specific point when
concentration of every
reacting species is unity
3. It is constant and does not
depend on the progress of
the reaction
Molecularity Order
1. It is number of
reacting species
1. It is the sum of
powers of
undergoing
simultaneous
collisions in the
reaction.
2. It is a theoretical
concept.
3. It can have integral
value only.
4. It cannot be zero.
5. It does not tell us
anything about the
mechanism of the
reaction.
concentration terms
in the rate law
expression
2. It is determined
experimentally.
3. It can have even
zero value.
4. It can also have
fractional values.
5. It tells us about the
slowest step in the
mechanism and hence
gives some clue about
mechanism of the
reaction.
24. (a) The conductivity of all the ions of the solution
which is kept between electrodes 1 cm apart and area
of the electrodes 1 cm 2 .
Molar conductivity can be defined as conductance of
all the ions present in the solution which contain 1
mol electrolyte in certain volume and solution is
kept between electrodes 1 cm apart and area of the
electrodes such that whole solution is present
between them.
(b) In this cell Zn acts as anode and Ag as cathode
°
E cell =
°
E Ag –
XtraEdge for IIT-JEE 80 FEBRUARY 2012
°
E Zn
= 0.344 – (– 0.76) = 1.104 V
∆G° = – n F E°cell = – 2 × 96500 × 1.104
= – 2.13 × 10 5 J
zM
25. (A) We know d =
V × N
⇒ 7.86 =
( 2.
68×
10
A
Z×
56
– 8
z ~ – 2 i.e. B.C.C. structure
)
3
23
× 6.
02×
10
(B) Total no. of atoms surrounding a particular atom
in crystal structure is called coordination number.
(i) In C.C.P → C.No. 12 ;
(ii) In B.C.C → C.No. 8
26. (a) 27Co +3 = [Ar]
Octahedral geometry
3d 4s 4p
d 2 sp 3