1. Xtra Edge February 2012 - Career Point

22. Match the column :
Column-I
(A) A photon stimulates the emission of another
photon of
(B) Photons of electromagnetic wave of different
wavelengths may have
(C) Two points on a wavefront must have
(D) For constructive interference the waves must
have
Column-II
(P) Same direction
(Q) Same energy
(R) Same phase
(S) Same frequency
CHEMISTRY
Questions 1 to 9 are multiple choice questions. Each
question has four choices (A), (B), (C) and (D), out of
which ONLY ONE is correct. Mark your response in
OMR sheet against the question number of that
question. + 3 marks will be given for each correct
answer and – 1 mark for each wrong answer.
1. The phenomenon of optical activity will be shown by -
A
A
B
B A
(A)
M
B B
A
A
(C) en M
A
en
(B)
(D)
2. Titration curve of Na2CO3 and HCl is as given below.
The indicators In1 and In2 respectively, must be –
pH
12
10
8
6
4
2
B
B
en
M
B
M
en
10 20 30 40 50 60
Volume of HCl (ml)
B
en
In1
In2
(A) phenolphthalein and methyl orange
(B) methyl orange and phenolphthalein
(C) methyl orange and phenol red
(D) phenolphthalein and phenol red.
3. Metallic sulphates can be obtained by reacting the
metals (above hydrogen in ECS), or its oxide,
hydroxide or carbonate with dil.H2SO4. Gp IA
metals also form hydrogen sulphates which can be
isolated in solid. In general metal sulphates are
soluble in water and crystallizes with water of
crystallization. Sulphate are thermally more stable
than nitrates. Select the stable hydrogen sulphate
which can be obtained in solid state -
(A) KHSO4 (B) CaHSO4
(C) FeHSO4 (D) All of these
4. Which of the following represent glyptal -
O O
(A) ––O–CH2–CH2–O–C C–––
4
O O
(B) ––NH–(CH2)6–NH–C––(CH2)4– C–––
4
O O
(C)
O
O
4
XtraEdge for IIT-JEE 50 FEBRUARY 2012
(D)
O
N
H
5. In the Cannizzaro's reaction given below :
⎯ –
OH
2Ph – CHO ⎯→ ⎯ Ph–CH2OH + PhCOO –-
the slowest step is -
(A) the attack of OH – at the carbonyl group
(B) the transfer of hydride to the carbonyl group
(C) the abstraction of proton from the carboxylic acid
(D) the deprotonation of Ph–CH2OH
6. The relative rates of solvolysis in 80% EtOH of the
following bromides is in the order –
Br
Br
I
II
III
(A) I > II > III (B) III > II > I
(C) II > III > I (D) II > I > III
4
Br