JEE MAIN - Chemistry (2019 - 9th January Morning Slot)
1
The major product of the following reaction is :
Answer
(A)
2
The major product of following reaction is :
Answer
(C)
RCHO
3
Arrange the following amines in the decreasing order of basicity :
Answer
(B)
III > I > II
4
The increasing order of pka of the following amino acids in aqueous solution is :
Gly, Asp, Lys, Arg
Answer
(C)
Asp < Gly < Lys < Arg
5
The compounds A and B in the following reaction are, respectively :
Answer
(D)
A = Benzyl chloride, B = Benzyl isocyanide
6
The major product of the following reaction is :
Answer
(A)
7
The correct decreasing order for acid strength is :
Answer
(D)
NO2CH2COOH > NCCH2COOH > FCH2COOH > ClCH2COOH
8
The correct match between Item-I and Item-II is :
Item-I (drug)
Item-II (test)
A
Chloroxylenol
P
Carbylamine test
B
Norethindrone
Q
Sodium hydrogen carbonet test
C
Sulphapyridine
R
Ferric chloride test
D
Penicillin
S
Bayer's test
Answer
(C)
A $$ \to $$ R; B $$ \to $$ S; C $$ \to $$ P; D $$ \to $$ Q
9
Which amongst the following is the strongest acid ?
Answer
(C)
CH(CN)3
10
Which one of the following statements regarding Henry's law is not correct ?
Answer
(A)
Higher the value of KH at a given pressure, higher is the solubility of the gas in the liquids
11
Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2 (T1 < T2). The correct graphical depiction of the dependence of work done (w) on the final volume (V) is :
Answer
(B)
12
The one that is extensively used as a piezoelectric material is :
Answer
(C)
quartz
13
A solution of sodium sulphate contains 92 g of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg$$-$$1 is :
Answer
(B)
4
14
Two complexes [Cr(H2O)6]Cl3 (A) and [Cr(NH3)6]Cl3 (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is :
Answer
(A)
$$\Delta $$0 values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
15
The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO4 electrolyzed in g during the process is : (Molar mass of PbSO4 = 303 g mol$$-$$1)
Answer
(C)
7.6
16
The following results were obtained during kinetic studies of the reaction ;
2A + B $$ \to $$ Products
Experiment
[A] (in mol L$$-$$1)
[b] (in mol L$$-$$1)
Initial Rate of reaction (In mol L$$-$$1 min$$-$$1)
I
0.10
0.20
6.93 G 10$$-$$3
II
0.10
0.25
6.93 G 10$$-$$3
III
0.20
0.30
1.386 G 10$$-$$2
The time (in minutes) required to consume half of A is :
Answer
(B)
10
17
For emission line of atomic hydrogen from ni = 8 to nf = n, the plot of wave number $$\left( {\overline v } \right)$$ against $$\left( {{1 \over {{n^2}}}} \right)$$ will be (The Rydberg constant, RH is in wave number unit)
Answer
(C)
Linear with slope RH
18
20 mL of 0.1 M H2SO4 solution is added to 30 mL of of 0.2 M NH4OH solution. The pH of the resultant mixture is : [pkb of NH4OH = 4.7].
Answer
(B)
9.0
19
Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :
Answer
(A)
inert pair effect
20
The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is :
Answer
(A)
5.92
21
In general, the properties that decrease and increase down a group in the periodic table, respectively, are :
Answer
(C)
Electronegativity and Atomic Radius.
22
According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2$$-$$ ?
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