List of top Chemistry Questions asked in JEE Main

The idea of froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$, respectively, are:

The isoelectronic set of ions is :

The major product formed in the following reaction is:

The major product formed in the following reaction is :

The metal used for making $X$-ray tube window is :

The primary pollutant that leads to photochemical smog is :

The principle of column chromatography is :

The structure of Nylon-6 is :

The structures of beryllium chloride in the solid state and vapour, phase, respectively,are :

A solution containing $62\, g$ ethylene glycol in $250 \,g$ water is cooled to $-10^{\circ}C$. If $K_f$ for water is $1.86\, K\, kg \,mol^{-1}$, the amount of water (in g) separated as ice is :

$ {Mn_2(CO)_{10}}$ is an organometallic compound due to the presence of :

The metal d-orbitals that are directly facing the ligands in $ {K_3[Co(CN)_6]}$ are :

The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :

Which of the following statements is not true ?

If x gram of gas is adsorbed by m gram of adsorbent at pressure P, the plot of \(\log \frac{x}{m}\) versus \(\log P\) is linear. The slope of the plot is :
(n and k are constants and n > 1)

Given
(i) 2Fe₂O₃(s) → 4Fe(s) + 3O₂(g); \(\Delta_r G^\circ = +1487.0\ \mathrm{kJ\ mol^{-1}}\)
(ii) 2CO(g) + O₂(g) → 2CO₂(g); \(\Delta_r G^\circ = -514.4\ \mathrm{kJ\ mol^{-1}}\)
Free energy change, \(\Delta_r G^\circ\) for the reaction
2Fe₂O₃(s) + 6CO(g) → 4Fe(s) + 6CO₂(g) will be :

When 2-butyne is treated with H₂/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH₃ it produces Y as the major product. Which of the following statements is correct ?

The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :

On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is :

Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations, pH of which one of them will be equal to 1 ?

All of the following share the same crystal structure except :

The major product formed in the following reaction is :

Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are \(M_x\) and \(M_y\), respectively where \(M_x = \frac{3}{4}M_y\). The relative lowering of vapor pressure of the solution in X is "m" times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of the solvent, the value of "m" is :

The total number of optically active compounds formed in the following reaction is :

For per gram of reactant, the maximum quantity of N₂ gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic wt. - Cr = 52 u, Ba = 137 u)