Educell document on objective type questions

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SECTION – I
Straight Objective Type
This section contains 9 multiple choice questions numbered 45 to 53. Each question has 4 choices (a),
(b), (c), (d), out of which ONLY ONE is correct.
Q.1 NaI in acetone is used to convert RX to RI. This reaction is effective
A) I-
is the strongest nucleophile among X-
B) NaX formed is less soluble than NaI
C) R slightly polarised has higher affinity for I-
D) Whenever RX reacts with some NaX0 then RX0 is the major product
Q.2 A Friedel Crafts acylation Reaction is carried out using HF-BF3 and an acid anhydride (aliphatic).
Which of these are/is true assuming all of the reactants are consumed.
a. One mole of catalyst is required.
b. over two moles of catalyst are required
c. the by product of the reaction is an aromatic acid
d. the by product is an aliphatic acid
A) a, b B) b, d C) a, d D) c, b
Q.3 In current form of periodic table elements up to which atomic number can be accommodated?
A) 120 B) 118 C) 110 D) infinite
Q.4 What is the minimum uncertainty in de-broglie wavelength of a moving electron accelerated by
potential difference 6 V. Uncertainty in position is 𝜋−1
nm.
A) .625 nm
B) .600 nm
C) .0625 nm
D) .0312 nm
𝑎𝑙𝑐 .𝐾𝑂𝐻
(A)
𝐵𝑟2/𝐶𝐶𝑙4
(B)
𝑎𝑙𝑐 .𝐾𝑂𝐻/𝑁𝑎𝑁 𝐻2
(C)
𝐻𝑔𝑆 𝑂4/𝑑𝑖𝑙 𝐻2 𝑆𝑂4
(D)Q.5
The correct statement about D is…
A) It gives positive Fehling Test
B) It does not give positive test with Braddy’s reagent
C) It gives positive Iodoform test
D) It gives effervescence with NaHCO3

Q.6 The normal boiling point of a liquid is 350 K. ∆Hvap is 35 KJ/mole at normal boiling point. Then…
A) If P>1 atm, ∆Svap >100J/K at 350K
B) If P<1atm, ∆Svap > 100J/K at 350K
C) If P<1 atm, ∆Svap = 100J/K at 350K
D) None of these
Q.7 What volume of 0.2M NH4Cl solution should be added to 100ml of 0.1 M NH4Cl to produce a
buffer solution of pH = 8.7 ?
A) 50 ml B) 100 ml C) 200 ml D) None of these.
Q.8 X + (NH4)2s → Metal sulphide Hot & Dil HNO
3 soluble
X can’t be.
A) Pb 2+
B) Cu2+
C) Hg2+
D) Ag+
More than one correct
Q1. A sample of H2O2 solution (H2O2 and H2O) has volume strength 33.6 and density 264 gm/lit.
Then…
A) Mol fraction of H2O2 is 0.25
B) Molarity of H2O2 is 3M
C) Molality of H2O2 is 18.51m
D) % w/v of H2O2 is 102%
Q2. Which statement(s) is/are correct for P4O10
A) It produces two acids with water
B) It does not change oxidation state on hydrolysis
C) It is a good dehydrating agent
D) It is paramagnetic

Assertion-Reason Type Questions
A. Statement I and Statement II both are correct and Statement II is the reason for Statement I.
B. Statement I and Statement II both are correct but Statement II is not the reason for Statement I.
C. Statement I is false and Statement II is true.
D. Statement II is false and Statement I is true.
E. Both statements are false.
1. Statement 1: Consider a balloon with a variable volume.The maximum volume that can be
attained is Vmax .The maximum height to which the balloon can rise is independent of the
payload.
Statement2: The effects of change in volume and density of air cancel each other out.
2. Statement1: Cyclobutane exists as a wing shaped (or puckered) conformer.
Statement2: It relieves from angle strain although slight increase in eclipsing conformations.
3. Statement1: In PF5 ,axial bond length (measured from nmr spectroscopy) is greater than
equatorial bond length.
Statement2: As suggested by VSEPR theory PF5 exists in trigonal bipyramidal shape.
4. Statement1: Only PPh3 and not PMe3 can be used for generation of ylide compounds in Wittig
reaction.
Statement2: Because the ylide compound Ph3P+
-CH2
-
⇌ Ph3P=CH2 is highly stable due to
resonance which is not in the Case of Me3P+
-CH2
-
.

Comprehension
Q1. Transition metals have the ability to form a wide variety of complex ions whose mechanism
is governed by Crystal Field Theory (CFT).
The value of splitting factor ∆ can be determined by measuring λmax and depends on ions as
well as ligands. In case of ligands, filling is done on the basis of spectroscopic series.
Electrons in the case of strong field ligands are filled such that a low spin state is attained and in
the case weak field ligands it is vice versa.
1) A chemist wants to determine the molecular geometry of the [CoCl4]2-
ion.
Which of the following gives the best suggestion for a measurement and for the
interpretation of that measurement?
A) Using absorption spectroscopy measure λmax, then calculate ∆o for octahedral
geometry
B) Measure the molecule’s magnetic moment and use the result to estimate the number
of un paired spin in the molecule .IF this number is low ,the geometry is likely to
be square planar, otherwise it is likely to be tetrahedral
C) Measure the molecule’s magnetic moment and use the result to estimate the number
of unpaired spin in the molecule. IF this number is low ,the geometry is likely to be
tetrahedral, otherwise it is likely to be square planar
D) Measure the molecule’s magnetic moment and use the result to estimate the number
of unpaired spin in the molecule. IF this number is low, the geometry is likely to be
tetrahedral; otherwise it is likely to be octahedral.
2) The equilibrium constant describing the formation of aqueous transition metal complex
containing bidentate ligands is usually much larger than corresponding constant for a
complex containing mono dentate ligand. Which of the following best explain the
generalization taking the example of octahedral coordination?
A) Since a bidentate ligand binds to two sites, the stabilizing enthalpy per ligand is about
twice that is expected for a mono dentate ligand .
B) When the bidentate ligands leave the solution to bind the metals, entropy is reduced.
C) When the six monodentate ligands leave the solution to bind the metal, entropy is
reduced, but is roughly balanced by the entropy increased due to the release of six
water molecules previously bound to the metal ions ,keeping it in the solution
D) When the six mono dentate ligands leave the solution to bind to the metal, entropy is
reduced, but is roughly balanced by the entropy increased due to the six water
molecules previously bound to the metal ions, keeping it in solution. When the three
bidentate ligands leave the solution to bind to the metal, entropy is reduced as well,
but this reduction is more than counter balanced by the entropy increased due to the
release of six water molecules previously bound to the metal ion.

3) The oxygen containing compound haemoglobin contains ‘heme’ groups each of
which bind to Fe2+
through nitrogen atoms at four of its coordination sites. A
nitrogen atom on the surrounding occupies the fifth site leaving space for an O2
molecule to bind to the iron atom at the sixth site in the octahedral geometry. Which
of the following is the most suitable statement?
A) The CO molecule may be dangerous to human because its position on the
spectroscopic series indicates that it might bind strongly to Fe2+
and prevent other
ligand from attaching.
B) The CN –
maybe dangerous to human because it participates in high spin complexes
C) The SCN-
ion may be dangerous to human because its position in spectrochemical
series it might bind strongly to Fe2+
and prevent other ligand from attaching.
D) Human could be protected from the toxic effect of CO by high concentrations of
chloride ion.
Q2. To determine the standard reduction potential of a solution, we measure it against a
saturated calomel electrode.
The above bridge is in balanced condition ….
Now if we titrate a mixture of Fe2+
and Fe3+
by
using KMnO4 , then the three readings of the
titration are as follows :
Fe2+
and Fe3+
solution volume : 20 ml
KMnO4 volumes used in 3 cases are:
7.1, 7 ml and 7 ml
Now add zinc to the solution of Fe2+
and Fe3+
and add half test tube of dil H2SO4.. Again titrate
the mixture by using KMnO4.
This time readings obtained (of KMnO4) are 12.2 ,12.1 ,12.1 (ml)
Now answer the following questions
1) EMF of Fe2+
as measured =
A) 0.41
B) 2.33
C) -0.41
D) -2.33

2) If we add KMnO4 slowly to Fe2+
and Fe3+
solution, then
A) EMF of the electrolytic cell decreases
B)
𝑑𝐸
𝑑𝑉
changes sign where V is the volume added
C)
𝑑2 𝐸
𝑑𝑉2 changes sign
D)
𝑑𝐸
𝑑𝑉
decreases
3) What is the amount of Fe3+
in the mixture of Fe2+
and Fe3+
…
A) 0.2856
B) 0.3856
C) 0.392
D) 0.292
Match the column
1.
A) 2,3,4-trihydroxybutanoic acid P)Geometrical Isomerism
B) dichlorocycloprapane Q) Optical Isomerism
C) 1,3-butadiene R) Functional Isomerism
D) diethyl ether S) Metamerism
2.
A) S2-
P) white ppt with AgNO3
B) NO2
-
Q) evolution of pungent smell gas with Al+NaOH
C) NO3
-
R) Brown fumes with conc. H2SO4 (hot)
D) C2O4
2-
S) colour changes in K2Cr2O7 occur

3. Let us consider the two cases of complex reactions
Case1: Series reaction A
𝑘1
B
𝑘2
C
Case2: Parallel reaction
A) In the first case, if k1=20, k2=10 then P)
B) In the second case if k1=40 and k2=25 then Q) percentage of [B]/([B]+[C])
=51.6 at any time t
C) In the first case time when [B] is maximum R)
D) In the first case k1=80 and k2=320 then S)
ln
𝑘2
𝑘1
𝑘2−𝑘1
T)
𝑙𝑛 𝑘1 𝑘2
𝑘1+𝑘2

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