List of top Chemistry Questions asked in JEE Main

The plots of radial distribution functions for various orbitals of hydrogen atom against r are given below: The correct plot for 3s orbital is : 

According to molecular orbital theory, the species among the following that does not exist is :
The solubility of AgCN in a buffer solution of pH=3 is x. The value of x is : [Assume : No cyano complex is formed ; $K_{sp}(\text{AgCN}) = 2.2 \times 10^{-16}$ and $K_a(\text{HCN}) = 6.2 \times 10^{-10}$]
In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $(x/m)$ is directly proportional to $P^x$. The value of x is :
Ellingham diagram is a graphical representation of :
Which of the following equation depicts the oxidizing nature of $H_2O_2$?
The correct statement about B$_2$H$_6$ is :
Given below are two statements : Statement I : CeO$_2$ can be used for oxidation of aldehydes and ketones. Statement II : Aqueous solution of EuSO$_4$ is a strong reducing agent. In the light of the above statements, choose the correct answer :
In which of the following pairs, the outer most electronic configuration will be the same ?
The hybridization and magnetic nature of [Mn(CN)$_6$]$^{4-}$ and [Fe(CN)$_6$]$^{3-}$, respectively are :
Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below :
Complete combustion of 1.80 g of an oxygen containing compound (C$_x$H$_y$O$_z$) gave 2.64 g of CO$_2$ and 1.08 g of H$_2$O. The percentage of oxygen in the organic compound is :

Identify A in the given chemical reaction. CH$_2$=CH-CH(CH$_3$)-CH$_3$ $\xrightarrow{Mo_2O_3, 773 K, 10-20 atm}$ A (major product)

Identify A and B in the chemical reaction. p-Nitrotoluene $\xrightarrow{Cl_2, h\nu}$ A $\xrightarrow{NaI, dry acetone}$ B

The major product of the following chemical reaction is : R-CN $\xrightarrow{(1) H_3O^+, \Delta (2) SOCl_2 (3) Pd/BaSO_4, H_2}$ ? (Using $R$ as the alkyl group from the prompt skeleton)
Which one of the following reactions will not form acetaldehyde ?

Compound(s) which will liberate carbon dioxide with sodium bicarbonate ($NaHCO_3$) solution is/are : A = Urea, B = Benzoic acid, C = p-Nitrophenol

Which of the following reaction/s will not give p-aminoazobenzene ? 

Which statement is correct ?
Which of the glycosidic linkage between galactose and glucose is present in lactose ?
0.4 g mixture of NaOH, Na$_2$CO$_3$ and some inert impurities was first titrated with N/10 HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of Na$_2$CO$_3$ in the mixture is _________
A car tyre is filled with nitrogen gas at 35 psi at 27$^\circ$C. It will burst if pressure exceeds 40 psi. The temperature in $^\circ$C at which the car tyre will burst is ___________
The reaction of cyanamide, NH$_2$CN(s), with oxygen was run in a bomb calorimeter and $\Delta U$ was found to be -742.24 kJ mol$^{-1}$. The magnitude of $\Delta H_{298}$ for the reaction NH$_2$CN(s) + 3/2 O$_2$(g) $\rightarrow$ N$_2$(g) + CO$_2$(g) + H$_2$O(l) is _________ kJ.
1 molal aqueous solution of an electrolyte A$_3$B$_3$ is 60% ionised. The boiling point of the solution at 1 atm is __________ K. [Given $K_b$ (H$_2$O) = 0.52 K kg mol$^{-1}$, $T_b$ pure water = 373.15 K]
In basic medium CrO$_4^{2-}$ oxidises S$_2$O$_3^{2-}$ to form SO$_4^{2-}$ and itself changes into Cr(OH)$_4^-$. The volume of 0.154 M CrO$_4^{2-}$ required to react with 40 mL of 0.25 M S$_2$O$_3^{2-}$ is _________ mL.