List of top Chemistry Questions asked in JEE Advanced

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 $Pb \left( NO _3\right)_2$ 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

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

\(2\) \(mol\) 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 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)

An aqueous solution is prepared by dissolving $0.1 \,mol$ of an ionic salt in $1.8\, kg$ of water at $35^{\circ} C$. The salt remains $90 \%$ dissociated in the solution. The vapour pressure of the solution is $59.724\, mm$ of Hg Vapor pressure of water at $35^{\circ} C$ is $60.000\, mm$ of Hg. The number of ions present per formula unit of the ionic salt is_____

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 $H =1, N =14, O =16, S =32, K =39, Cu =63, I =127$ ]

The correct option(s) about entropy (S) is(are)
$[ R =$ gas constant, $F =$ Faraday constant, $T =$ Temperature $]$

To check the principle of multiple proportions, a series of pure binary compounds $\left( P _{ m } Q _{ n }\right)$ were analyzed and their composition is tabulated below. The correct option(s) is(are)
 

Compound	Weight % of P	Weight % of Q
1	50	50
2	44.4	55.6
3	40	60

A solution is prepared by mixing $0.01\, mol$ each of $H _2 CO _3, NaHCO _3, Na _2 CO _3$, and $NaOH$ in $100 \, mL$ of water $pH$ of the resulting solution is ___ 
[Given : $p K _{ a 1}$ and $p K _{ a 2}$ of $H _2 CO _3$ are $6.37$ and $10.32$, respectively $; \log 2=0.30$ ]

The electrochemical extraction of aluminum from bauxite ore involves

If the reaction sequence given below is carried out with 15 moles of acetylene, the amount of the product D formed (in g) is _____.

The yields of A, B, C and D are given in parentheses.
[Given: Atomic mass of H = 1, C = 12, O = 16, Cl = 35]

A solution is prepared by mixing $0.01\, mol$ each of $H _2 CO _3, NaHCO _3, Na _2 CO _3$, and $NaOH$ in $100 \, mL$ of water $pH$ of the resulting solution is ___ [Given : $p K _{ a 1}$ and $p K _{ a 2}$ of $H _2 CO _3$ are $637$ and $1032$, respectively $; \log 2=030$ ]

The reaction of $HClO _3$ with $HCl$ gives a paramagnetic gas, which upon reaction with $O _3$ produces