JEE MAIN - Chemistry (2020 - 3rd September Morning Slot)

1
An acidic buffer is obtained on mixing :
Answer
(A)
100 mL of 0.1 M HCl and 200 mL of 0.1 M CH3COONa
2
The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products? JEE Main 2020 (Online) 3rd September Morning Slot Chemistry - Compounds Containing Nitrogen Question 162 English
Answer
(C)
(c) and (d)
3
Which one of the following compounds possesses the most acidic hydrogen?
Answer
(D)
JEE Main 2020 (Online) 3rd September Morning Slot Chemistry - Basics of Organic Chemistry Question 168 English Option 4
4
The complex that can show optical activity is :
Answer
(D)
cis-[CrCl2(ox)2]3– (ox = oxalate)
5
It is true that :
Answer
(B)
A zero order reaction is a multistep reaction
6
The atomic number of the element unnilennium is :
Answer
(A)
109
7
The photoelectric current from Na (Work function, w0 = 2.3 eV) is stopped by the output voltage of the cell
Pt(s) | H2 (g, 1 Bar) | HCl (aq., pH =1) | AgCl(s) | Ag(s).
The pH of aq. HCl required to stop the photoelectric current form K(w0 = 2.25 eV), all other conditions remaining the same, is _______ $$ \times $$ 10-2 (to the nearest integer).

Given, 2.303$${{RT} \over F}$$ = 0.06 V;
$$E_{AgCl|Ag|C{l^ - }}^0$$ = 0.22 V
Answer
142
8
The total number of monohalogenated organic products in the following (including stereoisomers) reaction is ______. JEE Main 2020 (Online) 3rd September Morning Slot Chemistry - Hydrocarbons Question 93 English
Answer
8
9
The volume strength of 8.9 M H2O2 solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L atm K-1 mol-1) (rounded off ot the nearest integer)
Answer
100
10
The mole fraction of glucose (C6H12O6 ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______.
Answer
47
11
Let CNaCl and CBaSO4 be the conductances (in S) measured for saturated aqueous solutions of NaCl and BaSO4, respectively, at a temperature T. Which of the following is false?
Answer
(D)
CNaCl >> CBaSO4 at a given T
12
Henry’s constant (in kbar) for four gases $$\alpha $$, $$\beta $$, $$\gamma $$ and $$\delta $$ in water at 298 K is given below :

$$\alpha $$ $$\beta $$ $$\gamma $$ $$\delta $$
KH 50 2 2 $$ \times $$ 10-5 0.5

(density of water = 103 kg m-3 at 298 K)
This table implies that :
Answer
A
B
13
Henry’s constant (in kbar) for four gases $$\alpha $$, $$\beta $$, $$\gamma $$ and $$\delta $$ in water at 298 K is given below :

$$\alpha $$ $$\beta $$ $$\gamma $$ $$\delta $$
KH 50 2 2 $$ \times $$ 10-5 0.5

(density of water = 103 kg m-3 at 298 K)
This table implies that :
Answer
A
B
14
The atomic number of the element unnilennium is :
Answer
(A)
109
15
An organic compound [A], molecular formula C10H20O2 was hydrolyzed with dilute sulphuric acid to give a carboxylic acid [B] and an alcohol [C]. Oxidation of [C] with
CrO3 - H2SO4 produced [B]. Which of the following strucutres are not possible for [A]?
Answer
D
B
16
The electronic spectrum of [Ti(H2O)6]3+ shows a single broad peak with a maximum at 20,300 cm-1 . The crystal field stabilization energy (CFSE) of the complex ion, in kJ mol-1, is :
Answer
(D)
97
17
Of the species, NO, NO+, NO2+ and NO- , the one with minimum bond strength is :
Answer
(A)
NO
18
Glycerol is separated in soap industries by :
Answer
(B)
Distillation under reduced pressure