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JEE Advanced
>
Chemistry
List of top Chemistry Questions asked in JEE Advanced
According to Bohr’s model, the highest kinetic energy is associated with the electron in the
JEE Advanced - 2024
JEE Advanced
Chemistry
Structure of atom
A closed vessel contains 10 g of an ideal gas X at 300 K, which exerts 2 atm pressure. At the same temperature, 80 g of another ideal gas Y is added to it and the pressure becomes 6 atm. The ratio of root mean square velocities of X and Y at 300 K is
JEE Advanced - 2024
JEE Advanced
Chemistry
States of matter
The option(s) with correct sequence of reagents for the conversion of
P
to
Q
is(are)
JEE Advanced - 2024
JEE Advanced
Chemistry
Organic Chemistry- Some Basic Principles and Techniques
In the following reaction sequence, the major product Q is
\(\text{L-Glucose}\xrightarrow[ii)Cr_2,775K,10-20 \text{atm}]{i)HI, \Delta}P\xrightarrow[UV]{Cl_2(excess)}Q\)
JEE Advanced - 2024
JEE Advanced
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Among the following, the correct statement(s) for electrons in an atom is(are)
JEE Advanced - 2024
JEE Advanced
Chemistry
Structure of atom
Among the following options, select the option in which each complex in
Set-I
shows geometrical isomerism and the two complexes in
Set-II
are ionization isomers of each other.
[en = H
2
NCH
2
CH
2
NH
2
]
JEE Advanced - 2024
JEE Advanced
Chemistry
coordination compounds
A sample initially contains only U-238 isotope of uranium. With time, some of the U-238 radioactively decays into Pb-206 while the rest of it remains undisintegrated.
When the age of the sample is P x10
8
years, the ratio of mass of Pb-206 to that of U-238 in the sample is found to be 7. The value of
P
is _____.
[Given: Half-life of U-238 is 4.5 x10
9
years; log
e
2 = 0.693]
JEE Advanced - 2024
JEE Advanced
Chemistry
Chemical bonding and molecular structure
An organic compound
P
with molecular formula C
9
H
18
O
2
decolorizes bromine water and also shows positive iodoform test.
P
on ozonolysis followed by treatment with H
2
O
2
gives
Q
and
R
. While compound
Q
shows positive iodoform test, compound
R
does not give positive iodoform test.
Q
and
R
on oxidation with pyridinium chlorochromate (PCC) followed by heating give
S
and
T
, respectively. Both
S
and
T
show positive iodoform test.
Complete copolymerization of 500 moles of Q and 500 moles of R gives one mole of a single acyclic copolymer U. [Given, atomic mass: H =1, C = 12, O =16]
JEE Advanced - 2024
JEE Advanced
Chemistry
Alcohols, Phenols and Ethers
When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex
P
is formed. In a strong acidic medium, the equilibrium shifts completely towards
P
. Addition of zinc chloride to
P
in a slightly acidic medium results in a sparingly soluble complex
Q
.
JEE Advanced - 2024
JEE Advanced
Chemistry
Law Of Chemical Equilibrium And Equilibrium Constant
To form a complete monolayer of acetic acid on 1g of charcoal, 100 mL of 0.5M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1M NaOH solution was required. If each molecule of acetic acid occupies P x 10
−23
m
2
surface area on charcoal, the value of
P
is _____.
[Use given data: Surface area of charcoal = 1.5 x 10
2
m
2
g
−1
; Avogadro’s number (N
A
) = 6.0 x 10
23
mol
−1
]
JEE Advanced - 2024
JEE Advanced
Chemistry
Surface Chemistry
Among [Co(CN)
4
]
4−
, [Co(CO)
3
(NO)], XeF
4
, [PCl
4
]
+
, [PdCl
4
]
2−
, [ICl
4
]
−
, [Cu(CN)
4
]
3−
and P
4
the total number of species with tetrahedral geometry is _____.
JEE Advanced - 2024
JEE Advanced
Chemistry
Chemical bonding and molecular structure
An organic compound
P
having molecular formula C
6
H
6
O
3
gives ferric chloride test and does not have intramolecular hydrogen bond. The compound
P
reacts with 3 equivalents of NH
2
OH to produce oxime
Q
. Treatment of
P
with excess methyl iodide in the presence of KOH produces compound
R
as the major product. Reaction of
R
with excess iso-butylmagnesium bromide followed by treatment with H
3
O
+
gives compound
S
as the major product.
The total number of methyl (−CH
3
) group(s) in compound S is ____.
JEE Advanced - 2024
JEE Advanced
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Vessel-1 contains
w
2
g of a non-volatile solute
X
dissolved in
w
1
g of water. Vessel-2 contains
w
2
g of another non-volatile solute
Y
dissolved in
w
1
g of water. Both the vessels are at the same temperature and pressure. The molar mass of
X
is 80% of that of
Y
. The van’t Hoff factor for
X
is 1.2 times of that of
Y
for their respective concentrations.
The elevation of boiling point for solution in Vessel-1 is _____ % of the solution in Vessel-2.
JEE Advanced - 2024
JEE Advanced
Chemistry
Solutions
For a double strand DNA, one strand is given below:
The amount of energy required to split the double strand DNA into two single strands is _____ kcal mol
−1
.
[Given: Average energy per H-bond for A-T base pair = 1.0 kcal mol
−1
, G-C base pair = 1.5 kcal mol
−1
, and A-U base pair = 1.25 kcal mol
−1
. Ignore electrostatic repulsion between the phosphate groups.]
JEE Advanced - 2024
JEE Advanced
Chemistry
Biomolecules
Among V(CO)
6
, Cr(CO)
5
, Cu(CO)
3
, Mn(CO)
5
, Fe(CO)
5
, [Co(CO)
3
]
3-
, [Cr(CO)
4
]
4-
, and Ir(CO)
3
, the total number of species isoelectronic with Ni(CO)
4
is _________.
[Given, atomic number: V = 23, Cr=24, Mn 25, Fe 26, Co 27, Ni 28, Cu = 29, Ir = 77]
JEE Advanced - 2024
JEE Advanced
Chemistry
Isomerism in Coordination Compounds
Consider the following reaction,
\(2H_2(g) + 2NO(g) \rightarrow N_2(g) + 2H_2O(g)\)
which follows the mechanism given below:
\(2NO(g)\underset{k_{-1}}{\stackrel{k_1}{\rightleftharpoons}} N_2O_2(g)\)
(fast equilibrium)
\(N_2O_2(g)+H_2(g) \xrightarrow[]{K_2}N_2O(g)+H_2O\)
(slow reaction)
\(N_2O(g)+H_2(g) \xrightarrow[]{K_3}N_2(g)+H_2O\)
(fast reaction)
The order of the reaction is________
JEE Advanced - 2024
JEE Advanced
Chemistry
Chemical Kinetics
Among the following complexes, the total number of diamagnetic species is ______.
[Mn(NH
3
)
6
]
3+
, [MnCl
6
]
3−
, [FeF
6
]
3−
, [CoF
6
]
3−
, [Fe(NH
3
)
6
]
3+
, and [Co(en)
3
]
3+
[Given, atomic number: Mn = 25, Fe = 26, Co = 27;
en = H
2
NCH
2
CH
2
NH
2
]
JEE Advanced - 2024
JEE Advanced
Chemistry
coordination compounds
Complete reaction of acetaldehyde with excess formaldehyde, upon heating with conc. NaOH solution, gives
P
and
Q
. Compound
P
does not give Tollens' test, whereas
Q
on acidification gives positive Tollens' test. Treatment of
P
with excess cyclohexanone in the presence of catalytic amount of p-toluenesulfonic acid (PTSA) gives product
R
.
Sum of the number of methylene groups (-CH2-) and oxygen atoms in
R
is _______
JEE Advanced - 2024
JEE Advanced
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Consider the following volume−temperature (V−T) diagram for the expansion of 5 moles of an ideal monoatomic gas.
Considering only P-V work is involved, the total change in enthalpy (in Joule) for the transformation of state in the sequence
X→Y→Z
is ______.
[Use the given data: Molar heat capacity of the gas for the given temperature range, C
V
,
m
= 12 J K
−1
mol
−1
and gas constant, R=8.3 JK
−1
mol
−1
]
JEE Advanced - 2024
JEE Advanced
Chemistry
Laws of thermodynamics
In the following reaction sequence, the major product P is formed.
Glycerol reacts completely with excess
P
in the presence of an acid catalyst to form
Q
. Reaction of
Q
with excess NaOH followed by the treatment with CaCl
2
yields Ca-soap
R
, quantitatively. Starting with one mole of
Q
, the amount of
R
produced in gram is ______.
[Given, atomic weight: H = 1, C = 12, N = 14, O = 16, Na = 23, Cl = 35, Ca = 40]
JEE Advanced - 2024
JEE Advanced
Chemistry
Alcohols, Phenols and Ethers
The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are
JEE Advanced - 2024
JEE Advanced
Chemistry
Chemical bonding and molecular structure
An aqueous solution of hydrazine (N
2
H
4
) is electrochemically oxidized by O
2
, thereby releasing chemical energy in the form of electrical energy. One of the products generated from the electrochemical reaction is N
2
(g).
Choose the correct statement(s) about the above process
JEE Advanced - 2024
JEE Advanced
Chemistry
Electrochemistry
The compound(s) having peroxide linkage is(are)
JEE Advanced - 2024
JEE Advanced
Chemistry
hydrogen peroxide
In a metal deficient oxide sample,
M
X
Y
2
O
4
(
M
and
Y
are metals),
M
is present in both +2 and +3 oxidation states and
Y
is in +3 oxidation state. If the fraction of M
2+
ions present in M is
\(\frac{1}{3}\)
, the value of X is______.
JEE Advanced - 2024
JEE Advanced
Chemistry
The solid state
The option(s) in which at least three molecules follow Octet Rule is(are)
JEE Advanced - 2024
JEE Advanced
Chemistry
Chemical bonding and molecular structure
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