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?
Answer
(C)
(c) and (d)
3
Which one of the following compounds possesses the most acidic hydrogen?
Answer
(D)
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).
The total number of monohalogenated organic
products in the following (including
stereoisomers) reaction is ______.
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 :