List of top Chemistry Questions asked in JEE Advanced

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

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range $900-1500 K$ is(are)

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

2 mol of Hg(g) is combusted in a fixed volume bomb calorimeter with excess of O₂ at 298 K and 1 atm into HgO(s). During the reaction, temperature increases from 298.0 K to 312.8 K. If heat capacity of the bomb calorimeter and enthalpy of formation of Hg(g) are 20.00 kJ K^–1 and 61.32 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 = 8.3 J K^–1 mol^–1]

Consider the strong electrolytes $Z_m X_n, U_m Y_p$ and $V_m X_n$. Limiting molar conductivity $\left(\Lambda^0\right)$ of $U _{ m } Y _{ p }$ and $V _{ m } X _{ n }$ are $250$ and $440 \,S \,cm ^2 mol ^{-1}$, respectively. The value of $( m + n + p )$ is ______ Given:

Ion	Zn+	Up+	Vn+	Xm-	Ym-
λ0 (S cm2 mol-1)	50.0	25.0	100.0	80.0	100.0

 $\lambda^0$ is the limiting molar conductivity of ions. The plot of molar conductivity (A) of $Z_{ m } X _{ n } v s c ^{1 / 2}$ is given below

Thermal decomposition of $AgNO _3$ produces two paramagnetic gases. The total number of electrons present in the antibonding molecular orbitals of the gas that has the higher number of unpaired electrons is _____

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

Consider the following reaction 

On estimation of bromine in $100 \,g$ of $R$ using Carius method, the amount of $AgBr$ formed (in $g$ ) is __ [Given : Atomic mass of $H =1, C =12, O =16, P =31, Br =80, Ag =108$ ]

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range $900-1500 K$ is(are)

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

Treatment of D-glucose with aqueous NaOH results in a mixture of monosaccharides, which are

Among the following, the correct statement(s) about polymers is(are)

The number of $- CH _2$ - (methylene) groups in the product formed from the following reaction sequence is_____

The compound(s) which react(s) with $NH _3$ to give boron nitride (BN) is(are)

Dissolving $1.24 \,g$ of white phosphorous in boiling $NaOH$ solution in an inert atmosphere gives a gas $Q$ The amount of $CuSO _4$ (in g) required to completely consume the gas $Q$ is ___ [Given : Atomic mass of $H =1, O =16, Na =23, P =31, S =32, Cu =63$ ]

Consider the following reaction 

On estimation of bromine in $100 \,g$ of $R$ using Carius method, the amount of $AgBr$ formed (in $g$ ) is __ [Given : Atomic mass of $H =1, C =12, O =16, P =31, Br =80, Ag =108$ ]