List of top Chemistry Questions asked in JEE Main

If \([Cu(H_2O)_4]^{2+}\) absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [\(Cu(H_2O)_6]^{2+}\) will be _______ \(×10^{–21} J\). [Nearest integer]
(Given : h = \(6.63 × 10^{–34} Js\) and \(c = 3.08×10^8 ms^{–1}\))

In the estimation of bromine, 0.5 g of an organic compound gave 0.40 g of silver bromide. The percentage of bromine in the given compound is _____% (nearest integer)
(Relative atomic masses of Ag and Br are 108 u and 80 u, respectively).

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

For the given reactions
Sn²⁺ + 2e^– → Sn
Sn⁴⁺ + 4e^– → Sn
the electrode potentials are;
\(E^{∘}_{Sn^{2+}/Sn}=−0.140V \) and \(E^{∘}_{Sn^{4+}Sn} =−0.010 V.\)
The magnitude of standard electrode potential for \(Sn^{4+}/Sn^{2+}\)i.e.
\(E^{∘}_{Sn^{4+}/Sn^{2+}}\)
is _________ × 10^–2 V. (Nearest integer)

Consider the following reaction sequence:

The product ‘B’ is:

If the uncertainty in velocity and position of a minute particle in space are, \(2.4 × 10^{–26}\) \((m s^{–1)}\) and \(10^{–7} (m)\), respectively. The mass of the particle in g is _____ . (Nearest integer)
(Given : \(h = 6.626 × 10^{–34} Js\))

Consider an imaginary ion \(\\_{22}^{48}X^{3−}\).The nucleus contains ‘a’% more neutrons than the number of electrons in the ion. The value of ‘a’ is ________. [nearest integer

For a reaction \(A → 2B + C\) the half lives are 100 s and 50 s when the concentration of reactant A is 0.5 and 1.0 mol L^–1, respectively. The order of the reaction is ______ .(Nearest integer)

The pair, in which ions are isoelectronic with \(Al^{3+}\) is:

Match List-I with List-II.

List-I		List-II
(A)	N₂(g) + 3H₂(g) \(\rightarrow\) 2NH₃(g)	(I)	Cu
(B)	CO(g) + 3H₂(g) \(\rightarrow\) CH₄(g) + H₂O(g)	(II)	Cu/ZnO – Cr₂O₃
(C)	CO(g) + H₂(g) \(\rightarrow\)HCHO(g)	(III)	Fe_xO_y + K₂O + Al₂O₃
(D)	CO(g) + 2H₂(g) \(\rightarrow\) CH₃OH(g)	(IV)	Ni