Transcript
JEE Main 2015
[1]
Chemistry 31.
The molecular formula of a commercial resin used for
35.
exchanging ions in water softening is C8 H 7SO 3Na
2 NO (g) O 2 (g)
(Mol. wt 206). Ca ions by the resin when expressed in mole per gram resin?
1 (2) 206
2 (3) 306
1 (4) 412
e
. 1012 formation of NO 2 ( g) at 298 K ? K p 16
e
e
(3) 86600
tice with a unit cell edge of 4.29 Å . The radius of sodium atom is approximately. (2) 3.22 Å
(3) 5.72 Å
(4) 0.93Å
Sol. [1] rB.C.C. 33.
(3) 3.4 eV
. eV (4) 68
Sol. [3] E 13.6
z2 eV n2
n 2 (First Excited state)
34.
E 3.4 eV
The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is: (1) ion-ion interaction (2) ion-dipole interaction (3) London fforce (4) hydrogen bond Sol. [4] Hydrogen bond is the type of dipole-dipole interaction.
j
R (298)
e
j
Sol. [4] 2 NO O 2 2 NO 2
G RT ln Kp
G RT ln 16 . 1012 G 2 G NO2 2 G NO
Which of the following is the energy of a possible excited state of a possible excited state of hydrogen? (2) 6.8 eV
e
ln 16 . 1012
j
. 1012 (4) 0.5 2 86,600 R(298) ln 16
3a 173 . 4.29 186 . Å 4 4
(1) 13.6 eV
j
. 1012 (2) 86600 R(298) ln 16
Sodium metal crystallizes in a body centered cubic lat-
(1) 186 . Å
j
. 1012 86600 (1) R(298) ln 16
Sol. [4] 2 mol of water softner require one mole of Ca 2 32.
2NO (g)
The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of
2
1 (1) 103
The following reaction is performed at 298 K.
b g e
G NO2 0.5 2 86,600 R 298 ln 16 . 1012 36.
j
The vapour pressure of acetone at 20 is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20 C, its vaopour pressure was 183 torr. The molar mass (g mol–1) of the substance is (1) 32 (2) 64 (3) 128 (4) 488
Sol. [2] O 2
p o p s w solute M solvent ps M solute w solvent
w solute 64 g mol 1
JEE Main 2015
[2]
37.
The standard gibbs energy change at 300 K for the reaction 2A B + C is 2494.2 J. At a given time, the composition of the reaction mixture is
40.
1 1 , B 2 and C . The reaction proceeds 2 2 in the : [R = 8.314 J/K/mol, e = 2.718] A
(1) forward direction because Q K C (2) reverse direction because Q K C
Sol. [1] Initial moles of CH 3COOH
(3) forward direction because Q K C
Finial moles of CH 3COOH
(4) reverse direction because Q K C
Kp e
Kp e 1
QP
2
e
0.9 60 103 18 Mg 3 Adsorb per gram of charcoal Mass
1 1 0.36 e 2.718
FG 1 IJ H 2K
41.
Two Faraday of electricity is passed through a solution of CuSO 4 . The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu) (1) 0 g (2) 63.5 g (3) 2 g (4) 127 g
Sol. [2] Cu 2 (aq ) 2e Cu(s)
2F 1 mol Cu = 63.5 g Cu 39.
Higher order (>3) reactions are rare due to : (1) low probability of simultaneous collision of all the reacting species (2) increase in entropy and activation energy as more molecules are involved (3) shifting of equilibrium towards reactants due to elastic collisions (4) loss of active species on collision Sol. [1] According to collision theory
The ionic radii (in Å) of N 3 , O2 and F are respectively: (1) 1.36, 1.40 and 1.71 (3) 1.71, 1.40 and 1.36
Q p K p backward
38.
0.042 50 2.1 103 1000
0.9 103
2494.2 8.314 300
1 2 4 2
0.06 50 3 103 1000
CH 3COOH adsorbed 3.0 103 2.1 103
Sol. [2] G RT ln Kp G / RT
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After qan hour it was filered and the strenght of tyhe filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is: (1) 18 mg (2) 36 mg (3) 42 gm (4) 54 mg
(2) 1.36, 1.71 and 1.40 (4) 1.71, and 1.36 and 1.40
Sol. [3] N 3 O2 F In isoelectronic series size decreases as 42.
z increases . e
In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false? (1) CO and CO2 are produced in this process (2) Al 2 O 3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity (3) Al 3 is reduced at the cathode to form Al (4) N a 3 A lF 6 serves as the electrolyte
Sol. [4] Refer to NCERT
JEE Main 2015
[3]
43.
Form the following statements regarding H 2 O 2 , choose the incorrect statement: (1) It can act only as an oxidizing agent (2) It decompose on exposure to light (3) It has to be stored in plastic or was lined glass bottles in dark (4) It has to be kept away form dust Sol. [1] It is disproportionating agent. 44.
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ? (1) CaSO4
(2) BeSO 4
(3) BaSO 4
(4) SrSO 4
47.
Which one has the highest boiling point ? (1) He (2) Ne (3) Kr (4) Xe Sol. [4] Boiling point Molecular mass 48.
b
pyridine): (1) 2 (3) 4 Sol. [2] 49.
enthalpy of Be 45.
and Mg
46.
(4) * transition
(1) Cl 2
(2) Br2
50.
(3) I 2
(4) ICI
(i) Wacker process
(B) PdCl 2
(ii) Ziegler - Natta polymeron
(C) CuCl 2
(iii) Contact process
(D) V2 O5
(iv) Deacon's process
(1) A (iii), B (ii), C (iv), D (i) (2) A (ii), B (i), C (iv), D (iii) (3) A (ii), B (iii), C (iv), D (i) (4) A (iii), B (i), C (ii), D (iv) Sol. [2]
TiCl 3
- Ziegler - Natta polymeron
PdCl 2
- Wacker process
CuCl 2
- Deacon's process
V2 O5
- Contact process
(2) 3 (4) 6
(3) L M charge transfer transtion Sol. [3]
(A) TiCl 3
is (py =
The color of KMnO 4 is due to :
Which among the following is the most reactive ?
Match the catalysts to the correct processes: Catalyst Process
(2) d d transition
.
Sol. [4] Interhalogen compounds are more reactive.
g
(1) M L charge transfer transition
MgSO4 are water soluble due to high hydration 2
gb
square planar Pt ( Cl) ( py) NH 3 NH 2 OH
Sol. [2] Among alkaline earth metal sulphates BeSO 4 and 2
The number of geometric isomers that can exist for
Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature. (1) Both assertion and reason are correct, and the reason is the correct explanation for the assertion (2) Both assertion and reason are correct, but the reason is the not correct explanation for the assertion (3) The asswertion is incorrect, but the reason is correct (4) Both the assertion and reason are incorrect Sol. [1] 51.
In carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the comkpound is (at mass Ag = 108, Br = 80) (1) 24 (2) 36 (3) 48 (4) 60
Sol. [1] % of Br
Atomic mass of Br Mass of AgBr Molecular mass of AgBr Mass of Compound
JEE Main 2015
[4]
52.
Which of the following compounds will exhibit geometrical isomerism? (1) 1-Phenyl - 2 butene (2) 3-Phenyl-1-butene (3) 2-Phenyl-1-butene (4) 1,1-Diphenyl-1-propane
56.
Sol. [1] H 3C CH CH CH 2 Ph 53.
In the reaction
the product E is
Which compound would give 5-keto-2-methyl hexanal upon ozonlysis?
(1) (1)
(2) (2)
(3)
(4) (3)
Sol. [2]
CH3 o o
Sol. [3] Sand mayer reaction 57.
CH3 54.
The synthesis of alkyl fluorides is best accomplished by: (1) Free radical fluorination (2) Sandmeyer's reaction (3) Finkelstein reaction (4) Swarts reaction
Sol. [4] R X AgF R F AgX 55.
(4)
SOCl
H / Pd
2 4 A 2 B C , Toluene BaSO 4
the product C is: (1) C 6 H 5COOH
(2) C 6 H 5CH 3
(3) C6 H 5CH 2 OH
(4) C6 H 5CHO
Sol. [4] A = C 6 H 5COOH , B = CH 5COCl C = C6 H 5CHO
58.
Which of the vitamins given below is water soluble? (1) Vitamin C (2) Vitamin D (3) Vitamin E (4) Vitamin K Sol. [1] Vitamin B and C are water soluble. 59.
In the following sequence of reactions: KMnO
Which polymer is used in the manufacture of paints and lacquers ? (1) Bakelite (2) Glyptal (3) Polypropene (4) Poly vinyl chloride Sol. [2]
Which of the following compounds is not an antacid ? (1) Aluminium hydroxide (2) Cimetidine (3) Phenelzine (4) Ranitidine Sol. [3] 60.
Which of the following compounds is not colored yellow ?
b g (2) K (3) b NH g Asb Mo O g (1) Zn 2 Fe CN 4 3
(4) BaCrO 4 Sol. [1]
6
3
10 4
3
b g
CO NO 2
6
