List of top Chemistry Questions asked in JEE Main

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $C_7H_{12}$ is __

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is ___ x $ 10^{-2} $ M. (Nearest integer)

An ideal gas with an adiabatic exponent 1.5, initially at 27°C is compressed adiabatically from 800 cc to 200 cc. The final temperature of the gas is:

‘X’ is the number of electrons in $ t_2g $ orbitals of the most stable complex ion among $ [Fe(NH_3)_6]^{3+} $, $ [Fe(Cl)_6]^{3-} $, $ [Fe(C_2O_4)_3]^{3-} $ and $ [Fe(H_2O)_6]^{3+} $. The nature of oxide of vanadium of the type $ V_2O_x $ is:

Given below are two statements:

In light of the above statements, choose the correct answer from the options given below:

Given below are two statements:
Statement (I): $\textit{An element in the extreme left of the periodic table forms acidic oxides.}$
Statement (II):$ \textit{Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.} In the light of the above statements, choose the correct answer from the options given below:$

Which of the following molecules hydrolyzes fast?

Which among the following compounds give yellow solid when reacted with NaOI/NaOH?
Choose the correct answer from the options given below:

The purification method based on the following physical transformation is: \[ {Solid} \xrightarrow{{Heat}} {Vapour} \xrightarrow{{Cool}} {Solid} \]

An aqueous solution of 0.1 M HA shows depression in freezing point of 0.2°C. If $ K_f $ (H$_2$O) = 1.86 K kg mol$^{-1}$ and assuming molarity = molality, find the dissociation constant of HA.

Match List - I with List - II: List - I: (A) $ {[MnBr}_4]^{2-} $
(B) $ {[FeF}_6]^{3-} $
(C) $ {[Co(C}_2{O}_4)_3]^{3-} $
(D) $ [Ni(CO)_4] $
List - II: (I) $ d^2sp^3 $ & diamagnetic
(II) $ sp^2d^2 $ & paramagnetic
(III) $ sp^3 $ & diamagnetic
(IV) $ sp^3 $ & paramagnetic
Choose the correct answer from the options given below:

Which of the following electronegativity order is incorrect?

An octahedral complex having molecular composition Co.5NH$_3$.Cl.SO$_4$ has two isomers A and B. The solution of A gives a white precipitate with AgNO$_3$ solution and the solution of B gives a white precipitate with BaCl$_2$ solution. The type of isomerism exhibited by the complex is,

For $[ \text{NiCl}_4 ]^{2-}$, what is the charge on the metal and shape of the complex respectively?

Lanthanoid ions with $4f^7$ configuration are: (A) Eu$^{2+}$ (B) Gd$^{3+}$ (C) Eu$^{3+}$ (D) Tb$^{3+}$ (E) Sm$^{2+}$ Choose the correct answer from the options given below:

Which of the following is the correct order of acidic strength for the following compounds: HNO$_3$, HClO$_4$, and HClO$_3$?

Pair of transition metal ions having the same number of unpaired electrons is :

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

Consider the following compound (X):

The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding C - H bond are: