List of top Chemistry Questions asked in JEE Advanced

Consider the reaction sequence from $P$ to $Q$ shown below. The overall yield of the major product $Q$ from $P$ is $75 \%$. What is the amount in grams of $Q$ obtained from $9.3 \,mL$ of $P ?$. (Use density of $P =1.00 \,g \,mL ^{-1}$; Molar mass of $C =12.0, H =1.0, O =16.0$ and $N =14.0 \,g \,mol ^{-1}$ )

An organic compound $\left( C _{8} H _{10} O _{2}\right)$ rotates plane-polarized light. It produces pink color with neutral $FeCl _{3}$ solution.What is the total number of all the possible isomers for this compound?

An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of $1 \,mL$ of $3 \% H _{2} O _{2}$, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ' $X$ '. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of $X$ ?

A solution of $0.1 \,M$ weak base $(B)$ is titrated with $0.1\, M$ of a strong acid $(HA)$. The variation of $pH$ of the solution with the volume of $HA$ added is shown in the figure below. What is the $p K_{ b }$ of the base? The neutralization reaction is given by $B + HA \rightarrow BH ^{+}+ A ^{-}$

The figure below is the plot of potential energy versus internuclear distance $(d)$ of $H _{2}$ molecule in the electronic ground state. What is the value of the net potential energy $E_{0}$ (as indicated in figure) in $kJ\, mol ^{-1}$, for $d=d_{0}$ at which the electron-electron repulsion and the nucleus-nucleus repulsion energies are absent? As reference, the potential energy of $H$ atom is taken as zero when its electron and the nucleus are infinitely far apart. Use Avogadro constant as $6.023 \times 10^{23} mol ^{-1}$

Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

Consider a $70 \%$ efficient hydrogen-oxygen fuel cell working under standard conditions at $1$ bar and $298 \,K$ Its cell reaction is
$H _{2}( g )+\frac{1}{2} O _{2}( g ) \rightarrow H _{2} O ( l )$
The work derived from the cell on the consumption of $1.0 \times 10^{-3} mol$ of $H _{2}( g )$ is used to compress $100\, mol$ of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in $K$ ) of the ideal gas?
The standard reduction potentials for the two half-cells are given below
$O _{2}(g)+4 H ^{+}(a q)+4 e^{-} \rightarrow 2 H _{2} O ( I ), E^{\circ}=1.23 \,V$
$2 H ^{+}(a q)+2 e^{-} \rightarrow H _{2}(g), E^{\circ}=0.00 \,V$
Use $F =96500 \,C\,mol ^{-1}, R=8.314\, J\,mol ^{-1} K ^{-1}$

The correct order of acid strength of the following carboxylic acids is

In the decay sequence, ${^{238}_{92}U->[-x_1] ^{234}_{90}Th->[-x_2] ^{234}_{91}Pa ->[-x_3]^{234}Z->[^{-x_4}] ^{230}_{90}Th}$ $x_1,x_2, x_3$ and $x_4$ are particles/radiation emitted by the respective isotopes. The correct option(s) is(are)

With reference to aqua regia, choose the correct option(s)

Molar conductivity ($\Lambda_{m}$) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentrations (c) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (critical micelle concentration (CMC) is marked with an arrow in the figures)

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent dipole moment at room temperature.

Fusion of $MnO_2$ with $KOH$ in presence of $O_2$ produces a salt W. Alkaline solution of W upon electrolytic oxidation yields another salt $X$. The manganese containing ions present in $W$ and $X$, respectively, are $Y$ and $Z$. Correct statement(s) is(are)

Which of the following statements) is (are) true?

A tin chloride Q undergoes the following reactions (not balanced) $Q+Cl^{-} \to X$ $Q+Me_{3}N \to Y$ $Q+CuCl_{2} \to Z+CuCl$ X is a monoanion having pyramidal geometry. Both Y and Z are neutral compounds. Choose the correct option(s)

Choose the correct option(s) from the following

The cyanide process of gold extraction involves leaching out gold from its ore with $CN^-$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

Calamine, malachite, magnetite and cryolite, respectively, are

Which of the following statement(s) is(are) correct regarding the root mean square speed ($U_{rms}$) and average translational kinetic energy $\left(\varepsilon_{av}\right)$ of a molecule in a gas at equilibrium ?

For a first order reaction ${A(g) \to 2B(g) + C(g)}$ at constant volume and $300\, K$, the total pressure at the beginning $(t = 0)$ and at time $t$ are $P_0$ and $P_t$, respectively. Initially, only $A$ is present with concentration $[A]0$, and $t_{1/3}$ is the time required for the partial pressure of $A$ to reach $1/3^{rd}$ of its initial value. The correct option(s) is (are) (Assume that all these gases behave as ideal gases)

The correct option(s) to distinguish nitrate salts of ${Mn^{2+}}$ and ${Cu^{2+}}$ taken separately is (are)

The correct option(s) regarding the complex ${[Co(en)(NH3)3(H2O)]^{3+} (en = H2NCH2CH2NH2)}$ is (are)

For a solution formed by mixing liquids $L$ and $M$, the vapour pressure of $L$ plotted against the mole fraction of $M$ in solution is shown in the following figure. Here $x _{ L }$ and $x _{ M }$ represent mole fractions of $L$ and $M$, respectively, in the solution. The correct statement $(s)$ applicable to this system is (are)

The colour of the $X_2$ molecules of group $17$ elements changes gradually from yellow to violet down the group. This is due to

An ideal gas is undergoing a cyclic thermodynamic process in different ways as shown in the corresponding $ Which one of the following options correctly represents a thermodynamic process that is used as a correction in the determination of the speed of sound in an ideal gas?