List of top Chemistry Questions asked in JEE Advanced

Tin is obtained from cassiterite by reduction with coke Use the data given below to determine the minimum temperature (in $K$ ) at which the reduction of cassiterite by coke would take place.
At $298 \,K ; \Delta_f H^{0}\left( SnO _{2}(s)\right)=-581.0 \,kJ\, mol ^{-1}, \Delta_{f} H^{0}\left( CO _{2}(g)\right)=-394.0\, kJ \,mol ^{-1}$,
$S^{0}\left( SnO _{2}(s)\right)=56.0 \,J \,K ^{-1} mol ^{-1}, S^{0}( Sn (s))=52.0 \,J \,K ^{-1} mol ^{-1}$,
$S^{0}( C (s))=6.0\, J\, K ^{-1} mol ^{-1}, S^{0}\left( CO _{2}(g)\right)=210.0 \,J \,K ^{-1} mol ^{-1}$,
Assume that the enthalpies and the entropies are temperature independent

A colorless aqueous solution contains nitrates of two metals, $X$ and $Y$. When it was added to an aqueous solution of $NaCl$, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue $P$ and a solution $Q$. The residue $P$ was soluble in aq $NH _{3}$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $KI$. The metals $X$ and $Y$, respectively, are

Which of the following liberates $O _{2}$ upon hydrolysis?

With respect to the compounds I-V, choose the correct statement(s).

Consider the reaction $A \rightleftharpoons B$ at $1000\, K$ At time '$t$', the temperature of the system was increased to $2000 \,K$ and the system was allowed to reach equilibrium. Throughout this experiment the partial pressure of $A$ was maintained at $1$ bar. Given below is the plot of the partial pressure of $B$ with time. What is the ratio of the standard Gibbs energy of the reaction at $1000\, K$ to that at $2000\, K$ ?

In the reaction scheme shown below, Q, R, and S are the major products.

The correct structure of

$5.00\, mL$ of $0.10 \,M$ oxalic acid solution taken in a conical flask is titrated against $NaOH$ from a burette using phenolphthalein indicator. The volume of $NaOH$ required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the $NaOH$ solution? 
 

Exp. No.	Vol. of NaOH (mL)
1	12.5
2	10.5
3	9.0
4	9.0
5	9.0

Consider the following four compounds I, II, III and IV. Choose the correct statement(s)

In an experiment, $m$ grams of a compound $X$ (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic filed, the pan with $X$ is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound $X$. Identify the correct statements(s)

Consider the following compounds in the liquid form:
$O _{2}, HF , H _{2} O , NH _{3}, H _{2} O _{2}, CCl _{4}, CHCl _{3}, C _{6} H _{6}, C _{6} H _{5} Cl$
When a charged comb is brought near their flowing stream, how many of them show deflection as per the following figure?

Choose the correct statement(s) among the following

The structure of a peptide is given below:

 If the absolute values of the net charge of the peptide at $pH =2, pH =6$, and $pH =11$ are $\left| z _{1}\right|,\left| z _{2}\right|$, and $\left| z _{3}\right|$, respectively, then what is $\left|z_{1}\right|+\left|z_{2}\right|+\left|z_{3}\right|$ ?

Which of the following plots is (are) correct for the given reaction? ([P] $_{0}$ is the initial concentration of $P$ )

The $1^{\text {st }}, 2^{\text {nd }}$, and the $3^{\text {rd }}$ ionization enthalpies, $I_{1}, I_{2}$, and $I_{3}$, of four atoms with atomic numbers $n, n+1$, $n+2$, and $n+3$, where 𝑛 < 10, are tabulated below. What is the value of n?

Atomic Number	Ionization Enthalpy (kJ/mol)
	I1	I2	I3
n	1681	3374	6050
n+1	2081	3952	6122
n+2	469	4562	6910
n+3	738	1451	7733

An acidified solution of $0.05 \,M\, Zn ^{2+}$ is saturated with $0.1 \,M \,H _{2} S$. What is the minimum molar concentration $(M)$ of $H ^{+}$required to prevent the precipitation of $ZnS$ ?
Use $K_{s p}( ZnS )=1.25 \times 10^{-22}$ and overall dissociation constant of $H _{2} S. K _{ NET }=K_{1} K_{2}=1 \times 10^{-21}$

Consider the following transformations of a compound $P$

 Choose the correct option(s)

In the chemical reaction between stoichiometric quantities of $KMnO _{4}$ and $KI$ in weakly basic solution, what is the number of moles of $I _{2}$ released for $4$ moles of $KMnO _{4}$ consumed?

Liquid $A$ and $B$ form ideal solution for all compositions of $A$ and $B$ at $25^{\circ} C$. Two such solutions with $025$ and $050$ mole fractions of $A$ have the total vapour pressures of $03$ and $04$ bar, respectively. What is the vapour pressure of pure liquid $B$ in bar?

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s)

The Fischer projection of D-erythrose is shown below.

D-Erythrose and its isomers are listed as P, Q, R, and S in Column-I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column II.
 

Column-I		Column-II
P		i	Diastereomer
Q		ii	Identical
R		iii	Enantiomer
S

The cubic unit cell structure of a compound containing cation $M$ and anion $X$ is shown below When compared to the anion, the cation has smaller ionic radius Choose the correct statement(s)

${ }_{92}^{238} U$ is known to undergo radioactive decay to form ${ }_{82}^{206} Pb$ by emitting alpha and beta particles. A rock initially contained $68 \times 10^{-6} g$ of ${ }_{92}{ }^{238} U$. If the number of alpha particles that itwould emit during its radioactive decay of ${ }_{92}^{238} U$ to ${ }_{82}{ }^{206} Pb$ in three half-lives is $Z \times 10^{18}$, then what is the value of $Z$ ?

Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of hydrogen gas in liters $( L )$ produced at $300 \,K$ and $1.0$ atm pressure, when $5.4 \,g$ of aluminium and $500\, mL$ of $50 \,M$ sulfuric acid are combined for the reaction?
(Use molar mass of aluminium as $27.0 \,g\,mol ^{-1}, R=0.082 \,atm$ $L\,mol ^{-1} K^{-1}$

In the following reaction, compound Q is obtained from compound P via an ionic intermediate.

|What is the degree of unsaturation of Q?

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?