JEE MAIN - Chemistry (2019 - 10th January Evening Slot)
1
The major product of the following reaction
Answer
(A)
2
Which is the most suitable reagent for the following transformation ?
Answer
(C)
I2/NaOH
3
The major product obtained in the following reaction is :
Answer
(A)
4
The major product of the following reaction is :
Answer
(D)
5
What will be the major product in the following mononitration reaction ?
Answer
(A)
6
What is the IUPAC name of the following compound ?
Answer
(A)
4–Bromo-3-methylpent-2-ene
7
For an elementary chemical reaction,
the expression for $${{d\left[ A \right]} \over {dt}}$$ is
Answer
(D)
2K1[A2] – 2K –1 [A]2
8
An aromatic compound 'A' having molecular formula C7H6O2 on treating with aqueous ammonia and heating forms compound 'B'. The compound 'B' on reaction with molecular bromine and potassium hydroxide provides compound 'C' having molecular formula C6H7N.. The structure of 'A' is
Answer
(B)
9
The pair that contains two P – H bonds in each of the oxoacids is
Answer
(A)
H3PO2 and H4P2O5
10
A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured) and B (green coloured). A can show optical activity, but B is optically inactive. What
type of isomers does A and B represcent?
Answer
(D)
Geometrical isomers
11
In the cell
Pt$$\left| {\left( s \right)} \right|$$H2(g, 1 bar)$$\left| {HCl\left( {aq} \right)} \right|$$AgCl$$\left| {\left( s \right)} \right|$$Ag(s)|Pt(s)
the cell potential is 0.92 V when a 10–6 molal HCl solution is used. The standard electrode potential of (AgCl/ AgCl– ) electrode is :
$$\left\{ {} \right.$$Given, $${{2.303RT} \over F} = 0.06V$$ at $$\left. {298} \right\}$$
Answer
(D)
0.20 V
12
5.1 g NH4SH is introduced in 3.0 L evacuated flask at 327ºC. 30% of the solid NH4SH decomposed to NH3 and H2S as gases . The Kp of the reaction at 327oC is (R = 0.082 L atm mol–1 K–1, Molar mass of S = 32 g mol–1 molar mass of N = 14 g mol–1)
Answer
(D)
0.242 atm2
13
The correct match between item 'I' and item 'II' is :
An ideal gas undergoes isothermal compression from 5m3 to 1 m3 against a constant external pressure of 4 Nm–2. Heat released in this process is used to increase the temperature of 1 mole of Al. If molar heat capacity of Al is 24 J mol–1 K–1, the temperature of Al increases by :
Answer
(A)
$${2 \over 3}K$$
15
Elevation in the boiling point for 1 molar solution of glucose is 2 K. The depression in the freezing point for 2 molal solution of glucose in the same solvent is 2 K. The relation between Kb and Kf is
Answer
(D)
Kb = 2 Kf
16
The amount of sugar (C12H22O11) required to prepare 2L of its 0.1 M aqueous solution is :
Answer
(C)
68.4 g
17
The process with negative entropy change is :
Answer
(C)
Synthesis of ammonia from N2 and H2
18
The 71st electron of an element X with an atomic number of 71 enters into the orbital :
Answer
(D)
5d
19
The difference in the number of unpaired electrons of a metal ion in its high spin and low-spin octahedral complexes is two. The metal ion is :
Answer
(C)
Co2+
20
The ground state energy of hydrogen atom is – 13.6 eV. The energy of second excited state of He+ ion in eV is :
Answer
(A)
$$-$$ 6.04
21
Which of the following tests cannot be used for identifying amino acids?
Answer
(B)
Barfoed test
22
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is :
_10th_January_Evening_Slot_en_1_1.png)
_10th_January_Evening_Slot_en_1_2.png)
_10th_January_Evening_Slot_en_2_1.png)
_10th_January_Evening_Slot_en_3_1.png)
_10th_January_Evening_Slot_en_3_2.png)
_10th_January_Evening_Slot_en_4_1.png)
_10th_January_Evening_Slot_en_4_5.png)
_10th_January_Evening_Slot_en_5_1.png)
_10th_January_Evening_Slot_en_5_3.png)
_10th_January_Evening_Slot_en_6_1.png)
_10th_January_Evening_Slot_en_7_1.png)
_10th_January_Evening_Slot_en_8_2.png)
