JEE MAIN - Chemistry (2025 - 3rd April Morning Shift)
1
The correct order of the complexes $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}(\mathrm{A}),\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}(\mathrm{B}),\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}(\mathrm{C})$ and $\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}(\mathrm{D})$ in terms of wavelength of light absorbed is
Answer
(C)
$\mathrm{D}>\mathrm{A}>\mathrm{B}>\mathrm{C}$
2
Which of the following statements are correct?
A. The process of adding an electron to a neutral gaseous atom is always exothermic.
B. The process of removing an electron from an isolated gaseous atom is always endothermic.
C. The $1^{\text {st }}$ ionization energy of boron is less than that of beryllium.
D. The electronegativity of C is 2.5 in $\mathrm{CH}_4$ and $\mathrm{CCl}_4$
E. Li is the most electropositive among elements of group I.
Choose the correct answer from the options given below:
Answer
(B)
B and C Only
3
$$ \text {Identify }[\mathrm{A}],[\mathrm{B}] \text { and }[\mathrm{C}] \text {, respectively in the following reaction sequence : } $$
Answer
(C)
4
$$ \text { Match the LIST-I with LIST-II } $$
LIST-I (Molecules/ion)
LIST-II (Hybridisation of central atom)
A.
$$ \mathrm{PF}_5 $$
I
$$ \mathrm{dsp}^2 $$
B
$$ \mathrm{SF}_6 $$
II
$$ \mathrm{sp}^3 \mathrm{~d} $$
C
$$ \mathrm{Ni}(\mathrm{CO})_4 $$
III
$$ \mathrm{sp}^3 \mathrm{~d}^2 $$
D
$$ \left[\mathrm{PtCl}_4\right]^{2-} $$
IV
$$ \mathrm{sp}^3 $$
$$ \text { Choose the correct answer from the options given below: } $$
Answer
(C)
A-II, B-III, C-IV, D-I
5
Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
Answer
(A)
The electron in a H atom's stationary state moves in a circle around the nucleus.
6
In the following system, $\mathrm{PCl}_5(\mathrm{~g}) \leftrightharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ at equilibrium, upon addition of xenon gas at constant T \& p , the concentration of
Answer
(B)
$\mathrm{PCl}_3$ will increase
7
$$ \text { In the following reactions, which one is NOT correct? } $$
Answer
(C)
8
Given below are two statements :
Statement I : The N - N single bond is weaker and longer than that of P - P single bond.
Statement II : Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions.
In the light of the above statements, choose the correct answer from the options given below
Answer
(C)
Both Statement I and Statement II are false
9
$$ \text { Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis? } $$
Answer
(A)
10
2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is:
(Given : Ebullioscopic constant of water $=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ )
Answer
(A)
377.3 K
11
Which of the following properties will change when system containing solution 1 will become solution 2 ?
Answer
(C)
Gibbs free energy
12
$$ \text {Identify the correct statements from the following. } $$
$$ \text {Choose the correct answer from the options given below: } $$
Answer
(D)
A & B Only
13
$$ \text { The least acidic compound, among the following is: } $$
Answer
(B)
D
14
Among $10^{-9} \mathrm{~g}$ (each) of the following elements, which one will have the highest number of atoms?
Element: $\mathrm{Pb}, \mathrm{Po}, \mathrm{Pr}$ and Pt
Answer
(A)
Pr
15
The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are :
A. $\mathrm{Cr}^{2+}$
B. $\mathrm{Fe}^{2+}$
C. $\mathrm{Fe}^{3+}$
D. $\mathrm{Co}^{2+}$
E. $\mathrm{Mn}^{3+}$
Choose the correct answer from the options given below:
Answer
(B)
A, B and E Only
16
$$ \text { Which of the following is the correct structure of L-Fructose? } $$
Answer
(B)
17
Given below are two statements :
Statement I : A catalyst cannot alter the equilibrium constant $\left(\mathrm{K}_{\mathrm{c}}\right)$ of the reaction, temperature remaining constant.
Statement II : A homogenous catalyst can change the equilibrium composition of a system, temperature remaining constant.
In the light of the above statements, choose the correct answer from the options given below
Answer
(A)
Statement I is true but Statement II is false
18
Correct order of limiting molar conductivity for cations in water at 298 K is :
In a reaction $A+B \rightarrow C$, initial concentrations of $A$ and $B$ are related as $[A]_0=8[B]_0$. The half lives of $A$ and $B$ are 10 min and 40 min , respectively. If they start to disappear at the same time, both following first order kinetics, after how much time will the concentration of both the reactants be same?
Answer
(B)
40 min
20
Number of molecules from below which cannot give iodoform reaction is :
The number of terminal ' $O$ ' present in the compound ' C ' is__________
Answer
6
23
0.5 g of an organic compound on combustion gave 1.46 g of $\mathrm{CO}_2$ and 0.9 g of $\mathrm{H}_2 \mathrm{O}$. The percentage of carbon in the compound is _______________. (Nearest integer)
[Given : Molar mass (in $\left.\mathrm{g} \mathrm{mol}^{-1}\right) \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16$ ]
Answer
80
24
The number of optical isomers exhibited by the iron complex $(\mathrm{A})$ obtained from the following reaction is___________.
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