List of top Chemistry Questions asked in JEE Advanced

Among [I3] + , [SiO4]4-, SO2Cl2, XeF2, SF4, ClF3, Ni(CO)4, XeO2F2, [PtCl4] 2−, XeF4, and SOCl2, the total number of species having sp3 hybridised central atom is ______.

The correct molecular orbital diagram for F2 molecule in the ground state is

On decreasing the 𝑝H from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from 10−4 mol L−1 to 10−3 mol L−1. The 𝑝Ka of HX is

H2S (5 moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is x, and the number of moles of electrons involved is y. The value of (x + y) is ____.

The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is___. [Use, molar mass (g mol−1): H = 1, C = 12, O = 16, Si = 28, Cl = 35.5] 
50 mL of 0.2 molal urea solution (density = 1.012 g mL−1 at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is ___. 
[Use: Molar mass of urea = 60 g mol−1 ; gas constant, R = 62 L Torr K−1 mol−1; Assume, ΔmixH = 0, ΔmixV = 0]
In the given reaction scheme, P is a phenyl alkyl ether, Q is an aromatic compound; R and S are the major products. 
Reaction Scheme
The correct statement about S is
The plot of log 𝑘𝑓 versus \(\frac{1}{T}\) for a reversible reaction, A (g) ⇌ P (g) is shown. 

Pre-exponential factors for the forward and backward reactions are 1015s-1 and 1011s-1 respectively. If the value of log K for the reaction at 500 K is 6, the value of |log kb| at 250K is_________[K = equilibrium constant of the reaction, 𝑘𝑓 = rate constant of forward reaction, 𝑘𝑏 = rate constant of backward reaction]
The complex(es), which can exhibit the type of isomerism shown by [Pt(NH3)2Br2], is(are) [en = H2NCH2CH2NH2]
Match the reactions in List-I with the features of their products in List-II and choose the correct option 
 List-I List-II 
(P)(-)-1-Bromo-2-ethylpentane SN2 Reaction
(single enantiomer) 		(1)  Inversion of configuration
(Q) (-)-2-Bromopentane SN2 Reaction
(single enantiomer) 		(2) Retention of configuration
(R) (-)-3- Bromo-3-methylhexane SN1 Reaction
(single enantiometer) 		(3) Mixture of enantiomers 
(S) single enantiomer SN1 Reaction
(single enantiometer)		(4) Mixture of structural isomers
  (5) Mixture of diastereomers

A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is

The total number of sp2 hybridised carbon atoms in the major product P (a non-heterocyclic compound) of the following reaction is ___.

Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option. 

 

List-I

 

List-II 

(P)  P2O3 + 3H2O →(1) P(O)(OCH3)Cl2
(Q) P4 + 3NaOH + 3H2O →(2) H3PO3
(R) PCl5 + CH3COOH → (3)PH3 
(S)  H3PO2 + 2H2O + 4AgNO3 →(4) POCl3 
  (5) H3PO4

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match List-I with List-II and  choose the correct option. 

 

In the following reactions, P, Q, R, and S are the major products.
reaction
The correct statement(s) about P, Q, R, and S is(are)
One mole of an ideal monoatomic gas undergoes two reversible processes (\(A → B\) and \(B → C\)) as shown in the given figure: 
One mole of an ideal monoatomic gas
\(A → B\) is an adiabatic process. If the total heat absorbed in the entire process (\(A → B\) and \(B → C\)) is \(R𝑇_2\  ln\ 10\), the value of \(2 log\ 𝑉_3\) is ___ . [Use, molar heat capacity of the gas at constant pressure, \(𝐶_{p,m} = \frac 52R\)]
In the scheme given below, X and Y, respectively, are
Metal Halide
Plotting \(\frac{1}{Λ_{m}}\) against \(cΛ_{m}\) for aqueous solutions of a monobasic weak acid (HX) resulted in a straight line with y-axis intercept of P and slope of S. The ratio \(\frac{P}{S}\) is 
[\(Λ_{m}\) = molar conductivity, 
\(Λ^{o}_{m}\)= limiting molar conductivity, 
\(c\) = molar concentration, 
\(K_{a}\) = dissociation constant of HX]
In a one-litre flask, 6 moles of A undergoes the reaction A (g) ⇌ P (g). The progress of product formation at two temperatures (in Kelvin), T1 and T2, is shown in the figure: 

If T1 = 2T2 and (∆G2Θ − ∆G1Θ) = RT2 ln x, then the value of x is ___ . [∆G1Θ and ∆G2Θ are standard Gibb’s free energy change for the reaction at temperatures T1 and T2, respectively.]

Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option.
[Atomic Number: Fe = 26, Mn = 25, Co = 27]
 List-I List-II
(P)\(t^6_{2g} e^0_g\)(1)\( [Fe(H_2O)_6]^{2+}\)
(Q)\(t^3_{2g} e^2_g\)(2)\( [Mn(H_2O)_6]^{2+}\)
(R)\(e^2t^3_{2}\)(3)\( [Co(NH_3)_6]^{3+}\)
(S)\(t^4_{2g} e^2_g\)(4)\([FeCl_4]^-\)
  (5)\( [CoCl_4]^{2-}\)

The correct statement(s) related to processes involved in the extraction of metals is(are)

In the following reactions, P, Q, R, and S are the major products.
Chemical Reactions
The correct statement(s) about P, Q, R, and S is(are)
50 mL of 0.2 molal urea solution (density = 1.012 g mL−1 at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is ___. 
[Use: Molar mass of urea = 60 g mol−1 ; gas constant, R = 62 L Torr K−1 mol−1; Assume, ΔmixH = 0, ΔmixV = 0]
A gas has a compressibility factor of 0.5 and a molar volume of 0.4 dm3 mol−1 at a temperature of 800K and pressure x atm. If it shows ideal gas behavior at the same temperature and pressure, the molar volume will be y dm3 mol−1. The value of \(\frac{x}{y}\) is ___. [Use: Gas constant, R = 8 × 10−2 L atm K−1 mol−1]
Among [I3] +,[SiO4]4-, SO2Cl2, XeF2, SF4, ClF3, Ni(CO)4, XeO2F2, [PtCl4] 2−, XeF4, and SOCl2, the total number of species having sp3 hybridised central atom is ______.