List of top Chemistry Questions asked in JEE Main

The d-electron configuration of \(\mathrm{[Ru(en)_3]Cl_2}\) and \(\mathrm{[Fe(H_2O)_6]Cl_2}\), respectively are :

The increasing order of the reactivity of the following compound in nucleophilic addition reaction is :

Propanal, Benzaldehyde, Propanone, Butanone

The incorrect statement is :

Consider the hypothetical situation where the azimuthal quantum number, \(l\), takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :

For the reaction
\(2A + 3B + \frac{3}{2}C \to 3P\), which statement is correct ?

Among the statements (I - IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.

The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)

The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol^-1. The number of valence electrons in the element is :

The volume strength of 8.9 M \(\mathrm{H_2O_2}\) solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L atm \(\mathrm{K^{-1}\,mol^{-1}}\)) (rounded off ot the nearest integer)

The photoelectric current from Na (Work function, \(w_0\) = 2.3 eV) is stopped by the output voltage of the cell
Pt(s) | \(\mathrm{H_2}\) (g, 1 Bar) | HCl (aq., pH =1) | AgCl(s) | Ag(s).
The pH of aq. HCl required to stop the photoelectric current form K(\(w_0\) = 2.25 eV), all other conditions remaining the same, is _______ \(\times\) \(10^{-2}\) (to the nearest integer).
Given, \(2.303\frac{RT}{F}\) = 0.06 V;
\(E^0_{\mathrm{AgCl|Ag|Cl^-}}\) = 0.22 V

The antifertility drug “Novestrol” can react with :

If the boiling point of H₂O is 373 K, the boiling point of H₂S will be :

Thermal power plants can lead to :

Tyndall effect is observed when:

In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies) respectively are :

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :

The electronic spectrum of \([\mathrm{Ti(H_2O)_6}]^{3+}\) shows a single broad peak with a maximum at 20,300 cm^-1 . The crystal field stabilization energy (CFSE) of the complex ion, in kJ mol^-1, is :

Glycerol is separated in soap industries by :

An acidic buffer is obtained on mixing :

Of the species, NO, NO⁺, NO²⁺ and NO^- , the one with minimum bond strength is :

The complex that can show optical activity is :

It is true that :

Henry's constant (in kbar) for four gases \(\alpha, \beta, \gamma\) and \(\delta\) in water at 298 K is given below :

	\(\alpha\)	\(\beta\)	\(\gamma\)	\(\delta\)
\(K_H\)	50	2	\(2\times10^{-5}\)	0.5

(density of water = \(10^3\ \mathrm{kg\,m^{-3}}\) at 298 K)
This table implies that :

Let C_NaCl and C_BaSO4 be the conductances (in S) measured for saturated aqueous solutions of NaCl and BaSO₄, respectively, at a temperature T. Which of the following is false?

The atomic number of the element unnilennium is :