1. H.O : JABALPUR : 1525, Wright Town, Ph. (0761) 4218116, 2400022, 8349992509, RAMPUR : Rampur Chowk, Above PNB RANJHI : Opp. Jain Mandir, Main Road, Ranjhi follow us on : momentumacademy www.momentumacademy.com momentumacademy 46. Consider the molecules 4 3 , CH NH and 2 HO . Which of the given statements is false ? (1) The H C H - - bond angle in 4 , CH the H N H - - bond angle in 3 NH , and the H O H - - bond angle in 2 HO are all greater than 90° (2) The H O H - - bond angle in 2 HO is larger than the H C H - - bond angle in 4 CH (3) The H O H - - bond angle in 2 HO is smaller than the H N H - - bond angle in 3 NH (4) The H C H - - bond angle in 4 CH is larger than the H N H - - bond angle in 3 NH 46.(2) 47. In the reaction 2 3 2 3 3 2 3 2 (1) / . (1) / . (2) (2) NaNH liq NH NaNH liq NH H C H X Y CH CH Br CH CH Br - º X and Y are : (1) 1 X = -Butyne ; 3 Y = -Hexyne (2) 2 X = -Butyne ; 3 Y = -Hexyne (3) 2 X = -Butyne ; 2 Y = -Hexyne (4) 1 X = -Butyne ; 2 Y = -Hexyne 47.(1) 48. Among the following, the correct order of acidity is : (1) 3 4 2 HClO HClO HClO HClO < < < (2) 2 3 4 HClO HClO HClO HClO < < < (3) 2 3 4 HClO HClO HClO HClO < < < (4) 4 2 3 HClO HClO HClO HClO < < < 48.(2) Acidic strength .. EN ve O S µ µ+ 2 3 4 HClO HClO HClO HClO < < < 1 + 3 + 5 + 7 + 49. The rate of a first-order reaction is 0.04 mol 1 1 l s - - at 10 seconds and 1 1 0.03 mol l s - - at 20 seconds after initiation of the reaction. The half-life period of the reaction is : (1) 24.1 s (b) 34.1 s (3) 44.1 s (d) 54.1 s 49.(1) 1 2 1 2 ( ) 2.303 log ( ) ( ) a x K t t a x - = - - 2.303 (0.04) log (20 10) (0.03) K = - 2.303 0.1249 10 K ´ = Our Top class IITian & Doctor faculty team promises to give you an authentic solution which will be fastest in the whole country. FEEL THE POWER OF OUR KNOWLEDGE & EXPERIENCE SOLUTION OF NEET PHASE-1/ AIPMT - 2016 (HELD ON 1st MAY SUNDAY 2016) (All Code - A/P/W, B/Q/X, C/R/Y, D/S/Z) SOLUTION [CHEMISTRY]
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SOLUTION OF NEET PHASE-1/ AIPMT - 2016SOLUTION OF NEET PHASE-1/ AIPMT - 2016 (HELD ON 1st MAY SUNDAY 2016) (All Code - A/P/W, B/Q/X, C/R/Y, D/S/Z) SOLUTION [CHEMISTRY] 2. H.O :JABALPUR
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2
1/ 2
2.303 log 2.303 0.1249
10t
´ ´=
1/ 2
0.3010 1024.1sec
0.1249t
´= =
50. Which one of the following characteristics isassociated with adsorption ?
(1) GD is negative but HD and SD are
positive
(2) GD , HD and SD all are negative
(3) GD and HD are negative but SD is
positive
(4) GD and SD are negative but HD is
positive
50.(2) Adsorption is spontaneous process,
so GD = negative
Adsorption is exothermic process,
so HD = negative
In adsorpiton entropy decreases,
so SD = negative
so ,G HD D and SD all are negative
51. In which of the following options the order ofarrangement does not agree with the variationof property indicated against it ?
(1) 3 2Al Mg Na F+ + + -< < < (increasing
ionic size)
(2) B C N O< < < (increasing first ionisation
enthalpy)
(3) I Br Cl F< < < (increasing electron gain
enthalpy)
(4) Li Na K Rb< < < (increasing metallic
radius)
51.(2 & 3)
(2) B C N O< < < (given I.P. order)
B C O N< < < (correct)
(3) I Br Cl F< < < (given egHD order)
I Br F Cl< < < (Correct)
52. Which of the following statements is false ?
(1) 2Mg + ions form a complex with ATP
(2) 2Ca + ions are important in blood clotting
(3) 2Ca + ions are not important in maintaining
the regular beating of the heart
(4) 2Mg + ions are important in the green partss
of plants
52.(3)
53. Which of the following statements abouthydrogen is incorrect ?
(1) Hydrogen has three isotopes of which tritiumis the most common
(2) Hydrogen never acts as cation in ionic salts
(3) Hydronium ion, 3H O+ exists freely in
solution
(4) Dihydrogen does not act as a reducing agent
53.(1)
54. The correct statement regarding a carbonylcompound with a hydrogen atom on itsalphacarbon, is :
(1) a carbonyl compound with a hydrogen atomon its alpha-carbon never equilibrates withits corresponding enol.
(2) a carbonyl compound with a hydrogen atomon its alpha-carbon rapidly equilibrates withits corresponding enol and this process isknown as aldehyde-ketone equilibration.
(3) a carbonyl compound with a hydrogen atomon its alpha-carbon rapidly equilibrates withits corresponding enol and this process isknown as carbonylation.
(4) a carbonyl compound with a hydrogen atomon its alpha-carbon rapidly equilibrates withits corresponding enol and this process isknown as keto-enol tautomerism.
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62.(1) 3 3 2 2 24 ( .) ( ) 2 2Cu HNO conc Cu NO NO H O+ ® + +
63. Which of the following reagents would distingusih
cis-cyclopenta 1,2- -diol from the trans-isomer?
(a) Acetone
(b) Ozone
(c) 2MnO
(d) Aluminium isopropxide
63.(1) Acetone
64. The correct thermodynamic conditions for thespontaneous reaction at all temperatures is :
(a) 0HD < and 0SD =
(b) 0HD > and 0SD <
(c) 0HD < and 0SD >
(d) 0HD < and 0SD <
64.(3) .G H T SD = D - D
For, 0HD < and 0,S G veD > D = - (always)
\ spontaneous at all temperatures
65. Lithium has a bcc structure. Its density is3530kg m- and its atomic mass is 16.94 g mol- .
Calculate the edge length of a unit cell of Lithium
metal. (23 16.02 10AN mol -= ´ )
(1) 154 pm (2) 352 pm
(3) 527 pm (4) 264 pm
65.(2) 3A
Z M
N ar
´=
´
For bcc structure
3 32, 530 0.530Z kg m g cmr - -= = =
23 3
2 6.940.530
6.02 10 a
´=
´ ´
3 23 34.348 10a cm-= ´
83.52 10a cm-= ´
352a pm=
66. Which one of the following orders is correct forthe bond dissociation enthalpy of halogenmolecules ?
(1) 2 2 2 2I Br Cl F> > >
(2) 2 2 2 2Cl Br F I> > >
(3) 2 2 2 2Br I F Cl> > >
(4) 2 2 2 2F Cl Br I> > >
66.(2) 2 2 2 2Cl Br F I> > >
¯
due to high lp lp- repulsion
67. Which of the following is an analgesic ?
(1) Novalgin (2) Penicillin
(3) Streptomycin (4) Chloromycetin
67.(1) Novalgin used as analgesic.
68. Equal moles of hydrogen and oxygen gases areplaced in a container with a pin-hole throughwhich both can escape. What fraction of theoxygen escapes in the time required for one-half of the hydrogen to escape ?
(1) 1/8 (2) 1/4
(3) 3/8 (4) 1/2
68.(1)2 2H On n= and
2 2H Ot t=
According to Graham’s law
2 2
2 2
1 1
2 2
/ 32
/ 2
H O
O H
r M v t
r M v t= Þ =
1/ 216 4
1/ x= =
42
x=
\ 8x =
\ Fraction of 2 1/ 8O =
69. Consider the nitration of benzene using mixed
conc. 2 4H SO and 3HNO . If a large amount of
4KHSO is added to the mixture, the rate of
nitration will be:-
(1) faster (2) slower
(3) unchanged (4) doubled
69.(2) Slower, as large amount of 4HSO- will decrease
ionisation of 2 4H SO that result in lesser
ionisation of nitric acid and lesser formation of
nitronium ion 2[ ]NO+
70. Predict the correct order among the following :
(1) lone pair- lone pair > lone pair - bond pair >bond pair - bond pair
(2) lone pair - lone pair > bond pair - bond pair> lone pair - bond pair
(3) bond pair - bond pair > lone pair - bond pair> lone pair - lone pair
(4) lone pair - bond pair > bond pair - bond pair> lone pair - lone pair