List of top Questions asked in JEE Main

Cation of salt A when treated in flame gives apple green colour. When salt A is heated with Chromate solution gives yellow precipitate & when salt is heated with conc $HNO_3$ & Ammionium molybdate it gives canary yellow ppt. Salt A contains :

Statement-1 : Benzyl chloride reacts faster than ethyl chloride towards $S_N1$.
Statement-2 : Positive charge on ethyl will be unstable.

Statement-I : 1, 2, 3-trihydroxy propane can be separated from water by using simple distillation.
Statement-II : Azeotropic mixture cannot be separated by using fractional distillation.

Match correctly with the reagents given in column-I with organic compounds given in column-II.

Column-I (Name of test)	Column-II (Pair of compounds)
(i) Neutral $FeCl_3$ test	(P) Aldehyde vs Ketone pairs
(ii) Isocyanide test $CHCl_3 + KOH/\Delta$	(Q) Phenol vs Ethanol pairs
(iii) Ammonical silver nitrate test	(R) Primary amine vs Secondary amine pairs
(iv) $NaHCO_3$ test	(S) Carboxylic acid vs Phenol pairs

Consider following reaction :
$Fe(OH)_2 + 2e^- \rightarrow Fe(s) + 2OH^-$ , $E^{\circ} = -0.88 \text{ V}$
$AgBr(s) + e^- \rightarrow Ag(s) + Br^-(aq)$ , $E^{\circ} = 0.07 \text{ V}$
Select the correct statement.
(1) $E^{\circ}_{cell} = -0.95 \text{V}$
(2) $E^{\circ}_{cell}$ is an extensive property
(3) $Fe$ is getting reduced
(4) Net cell reaction: $Fe(s) + 2OH^-(aq) + 2AgBr(s) \rightarrow Fe(OH)_2 + 2Ag(s) + 2Br^-(aq)$

Match the column and select correct option:-
(i) Vit. $B_1$ → (P) Ascorbic acid
(ii) Vit. $B_2$ → (Q) Riboflavin
(iii) Vit. $B_6$ → (R) Thiamine
(iv) Vit. C → (S) Pyridoxine

Organic compound $C_5H_{10}$ does not give Baeyer’s reagent test. Calculate total number of structural monobromo isomers when react with $Br_2/h\nu$.

Which of the following order is correct for priority of functional group in IUPAC nomenclature?

18 g of steam reacted with iron to form $Fe_3O_4$, how much iron will be consumed.

For reaction $A \rightleftharpoons B$, $\Delta G^{\circ} = 105 - 35 \log T$. Find the transition temperature (in $^{\circ} C$) of the above reaction at 1 bar.

Given $K_{SP}(Ag_2C_2O_4) = 32X$, $K_{SP}(AgBr) = 4Y$. Find ratio of solubility of the given salts in pure water

For a reversible adiabatic process involving ideal gas if initial pressure and volume are 8 bar and $0.15 \text{ m}^3$ respectively and final pressure is 1 bar. Calculate |work done| (in Kilo Joule) [$C_V = 2R, C_P = 3R$]

Angular momentum of the electron in a hydrogen atom is $\frac{3h}{2\pi}$ then find total energy of electron (in eV/atom)

19.5 gm $FCH_2COOH$ is dissolved in 500 gm water due to which depression in freezing point is found to be $1^{\circ} C$. Calculate $K_a$ of $FCH_2COOH$. $K_f$ of water = 1.86 K-kg/mole, m = M

For first order reaction, rate constant at $27^{\circ} C$ and $t^{\circ} C$ are $1.5 \times 10^3$ and $4.5 \times 10^3$ respectively. If activation energy of the reaction is $60 \text{ kJmol}^{-1}$, then ($R = 8.3 \text{ Jmol}^{-1}K^{-1}$) $\ln 3 = 1.1$
Find temperature 't' (in $^{\circ} C$).

Relation between $t_{1/2}$ & $t_{100\%}$ for zero order & Ist order reaction respectively is:

One mole of an alkane on complete combustion required 8 mole of $O_2$, find out sum of carbon and hydrogen atoms in one molecule of the alkane.

An electromagnetic wave of frequency 100 MHz propagates through a medium of conductivity, $\sigma = 10$ mho/m. The ratio of maximum conduction current density to maximum displacement current density is _________.
$\left[ \text{Take } \frac{1}{4\pi\epsilon_0} = 9 \times 10^9 \text{ Nm}^2/\text{C}^2 \right]$

\( f(x) \) is a 5 degree polynomial that has extremes at \( x = \pm 1 \) and \( \lim_{x \to 0} \frac{f(x)}{x^3} = 5 \), then \( f(2) - f(-2) \) is:

Arrange the following complexes in increasing order of CFSE (\( \Delta o \))
(a) \( [Co(H_2O)_6]^{2+} \)
(b) \( [Co(H_2O)_6]^{3+} \)
(c) \( [Co(en)_3]^{3+} \)

Consider the following reaction:
(i) \( \text{Benzene} \) with \( \text{O}_2 \) and \( \text{H}_2\text{O} \)
Products obtained are:

One mole of alkane reacts with 8 moles of \( O_2 \). The molecular formula of alkane is: