List of top Chemistry Questions asked in JEE Advanced

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 (∆G₂^Θ − ∆G₁^Θ) = RT₂ ln x, then the value of x is ___ . [∆G₁^Θ and ∆G₂^Θ are standard Gibb’s free energy change for the reaction at temperatures T₁ and T₂, respectively.]

One mole of an ideal monoatomic gas undergoes two reversible processes (\(A → B\) and \(B → C\)) as shown in the given figure: 

\(A → B\) 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, \(𝐶_{p,m} = \frac 52R\)]

“PARAGRAPH II” A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of NaNO₂/HCl at 0^oC provides P as the product. P, upon treatment with excess of H₂O at room temperature, gives the product Q. Bromination of Q in aqueous medium furnishes the product R. The compound P upon treatment with an excess of phenol under basic conditions gives the product S. The molar mass difference between compounds Q and R is 474 g mol^–1 and between compounds P and S is 172.5 g mol^–1. The total number of carbon atoms and heteroatoms present in one molecule of S is ______ . 
[Use: Molar mass (in g mol^–1): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms] 

The total number of chiral molecules formed from one molecule of $P$ on complete ozonolysis $\left( O _3, Zn / H _2 O \right)$ is_____

Concentration of $H _2 SO _4$ and $Na _2 SO _4$ in a solution is $1 M$ and $1.8 \times 10^{-2} M$, respectively. Molar solubility of $PbSO _4$ in the same solution is $X \times 10^{- Y } M$ (expressed in scientific notation). The value of $Y$ is ________. [Given: Solubility product of $PbSO _4\left(K_{s p}\right)=1.6 \times 10^{-8}$ For $H _2 SO _4, K_{a l}$ is very large and $\left[K_{a 2}=1.2 \times 10^{-2}\right]$

The treatment of galena with $HNO _3$ produces a gas that is

The reduction potential \(\left(E^0, in\ V\right)\) of \(MnO _4^{-}( aq ) / Mn ( s )\) is\(\left[ Given : E_{\left( MnO _4^-( aq ) / MnO _2( s )\right)}^0=1.68 V ; E_{\left( MnO _2( s )/ Mn ^{2+}( aq )\right)}^0=1.21 V ; E_{\left( Mn ^2( aq ) / Mn ( s )\right)}^0=-1.03 V \right]\)

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_z$ orbitals is(are)

Considering the reaction sequence given below, the correct statement(s) is(are)

 

The reaction of $Xe$ and $O _2 F _2$ gives a Xe compound $P$. The number of moles of HF produced by the complete hydrolysis of $1 \,mol$ of $P$ is ______

The reaction $Pb \left( NO _3\right)_2$ and $NaCl$ in water produces a precipitate that dissolves upon the addition of $HCl$ of appropriate concentration The dissolution of the precipitate is due to the formation of

\(2\) \(mol\) of \(Hg(g)\) is combusted in a fixed volume bomb calorimeter with excess of \(O_2\) at 298K and 1 atm into \(HgO(s)\) During the reaction, temperature increases from \(2980\) \(K\) to \(3128\) \(K\). If heat capacity of the bomb calorimeter and enthalpy of formation of \(Hg(g)\) are \(2000\) \(kJ \;K^{-1}\) and \(6132\) \(kJ \;mol^{-1}\) at \(298\) \(K\), respectively, the calculated standard molar enthalpy of formation of \(HgO(s)\) at \(298\) \(K\) is \(X\) \(kJ \;mol^{-1}\) The value of | \(X\) | is [Given : Gas constant \(R\) =\(83\) \(J\) \(K^{-1}\) \(mol^{-1}\)] 

The correct option(s) related to adsorption processes is(are)

The weight percentage of hydrogen in Q, formed in the following reaction sequence, is ________.

[Given : Atomic mass of H = 1, C = 12, N = 14, O = 16, S = 32, Cl = 35]

Match the rate expressions in LIST-I for the decomposition of X with the corresponding profiles provided in
LIST-II. X_s and k are constants having appropriate units.

LIST I		LIST II
I	rate =\(\frac{k[X]}{Xs+[X]}\) under all possible initial concentration of X	P
II	rate =\(\frac{k[X]}{Xs+[X]}\) where initial concentration of X are much less than Xs​	Q
III	rate =\(\frac{k[X]}{Xs+[X]}\) where initial concentration of X are much higher than Xs​	R
IV	rate =\(\frac{k[X]^2}{Xs+[X]}\),where initial concentration of X is much higher than Xs​	S
		T

 

LIST-I contains metal species and LIST-II contains their properties.
 

LIST-I		LIST-II
I	\(\text{[Cr(CN)}_6\text{]}^{4-}\)	P	t2g orbitals contain 4 electrons
II	\(\text{[RuCl}_6\text{]}^{2-}\)	Q	\(\mu\)(spin-only) = 4.9 BM
III	\(\text{[Cr(H}_2\text{O)}_6\text{]}^{2+}\)	R	low spin complex ion
IV	\(\text{[Fe(H}_2\text{O)}_6\text{]}^{2+}\)	S	metal ion in 4+ oxidation state
		T	d4 species

[Given : Atomic number of Cr = 24, Ru = 44, Fe = 26] 
Metal each metal species in LIST-I with their properties in LIST-II, and choose the correct option.

LIST-I contains compounds and LIST-II contains reaction
 

LIST-I		LIST-II
I	\(\text{H}_2\text{O}_2\)	P	\(\text{Mg(HCO}_3\text{)}_2 + \text{Ca(OH)}_2 \rightarrow \)
II	\(\mathrm{Mg(OH)_2}\)	Q	\(\text{BaO}_2 + \text{H}_2\text{SO}_4 \rightarrow \)
III	\(\text{BaCl}_2\)	R	\(\text{Ca(OH)}_2 + \text{MgCl}_2 \)
IV	\(\text{CaCO}_3\)	S	\(\text{BaO}_2 + 2\text{HCl} \rightarrow\)
		T	\(\text{Ca(HCO}_3\text{)}_2 + 2\text{Ca(OH)}_2 \rightarrow \)

Match each compound in LIST – I with its formation reaction(s) in LIST-II, and choose the correct option

Match the compounds in LIST-I with the observations in LIST-II, and choose the correct option.
 

LIST-I			LIST-II
I	Aniline	P	Sodium fusion extract of the compound on boiling with FeSO4, followed by acidification with conc. H2SO4, gives Prussian blue color.
II	o-Cresol	Q	Sodium fusion extract of the compound on treatment with sodium nitroprusside gives blood red color.
III	Cysteine	R	Addition of the compound to a saturated solution of NaHCO3 results in effervescence.
IV	Coprolactam	S	The compound reacts with bromine water to give a white precipitate
		T	Treating the compound with neutral FeCl3 solution produces violet color.

Atom X occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closest to

The number of isomeric tetraenes (NOT containing $s p$-hybridized carbon atoms) that can be formed from the following reaction sequence is ______.

Considering the following reaction sequence,

the correct option(s) is(are)

The treatment of an aqueous solution of $3.74\, g$ of $Cu \left( NO _3\right)_2$ with excess $KI $ results in a brown solution along with the formation of a precipitate.Passing $H _2 S$ through this brown solution gives another precipitate $X$ The amount of $X$ (in $g$ ) is ___ . [Given : Atomic mass of $H =1, N =14, O =16, S =32, K =39, Cu =63, I =127$ ]