JEE Main 2025 Question Paper (24-Jan-2025) (Shift 1)

Question 1

For the given cell ${\mathrm{Fe}}^{2+}\left(\mathrm{aq}ight) + {\mathrm{Ag}}^{+}\left(\mathrm{aq}ight) 	o {\mathrm{Fe}}^{3+}\left(\mathrm{aq}ight) + \mathrm{Ag}\left(\mathrm{s}ight)$, the standard cell potential of the above reaction is given:$ \begin{aligned} &{\mathrm{Ag}}^{+} + {\mathrm{e}}^{-} 	o \mathrm{Ag} \quad\quad\quad\quad\quad {\mathrm{E}}^{0} = x\,\mathrm{V} \ &{\mathrm{Fe}}^{2+} + 2{\mathrm{e}}^{-} 	o \mathrm{Fe} \quad\quad\quad\quad\quad {\mathrm{E}}^{0} = y\,\mathrm{V} \ &{\mathrm{Fe}}^{3+} + 3{\mathrm{e}}^{-} 	o \mathrm{Fe} \quad\quad\quad\quad\quad {\mathrm{E}}^{0} = z\,\mathrm{V} \end{aligned} $

Accepted Answer

$ x + 2y - 3z $

Answer

x + y - z

Answer

y - 2x

Answer

$ x + 2y $

Question 2

Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with H-Br(aq) at the fastest rate?

Accepted Answer

Q

Answer

S

Answer

R

Answer

P

Question 3

One mole of the octahedral complex compound Co(NH$_{3}$)$_{5}$Cl$_{3}$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of AgNO$_{3}$ solution to yield two moles of AgCl$_{(s)}$. The structure of the complex is :

Accepted Answer

[Co(NH$_{3}$)$_{5}$Cl]Cl$_{2}$

Answer

[Co(NH$_{3}$)$_{4}$Cl]·Cl$_{2}$·NH$_{3}$

Answer

[Co(NH$_{3}$)$_{4}$Cl$_{2}$]Cl·NH$_{3}$

Answer

[Co(NH$_{3}$)$_{3}$Cl$_{3}$] \cdot 2	ext{NH}_{3}

Question 4

Which one of the carbocations from the following is most stable?

Accepted Answer

""

Answer

Answer

Answer

Question 5

Which of the following linear combinations of atomic orbitals will lead to the formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in z-direction]?
A. 2p$_{z}$ and 2p$_{x}$
B. 2s and 2p$_{x}$
C. 3d$_{xy}$ and 3d$_{x^{2}-y^{2}}$
D. 2s and 2p$_{z}$
E. 2p$_{z}$ and 3d$_{x^{2}-y^{2}}$

Accepted Answer

D Only

Answer

E Only

Answer

A and B Only

Answer

C and D Only