List of top Chemistry Questions asked in JEE Main

Transition metal complex with highest value of crystal field splitting \((Δ_0)\) will be

Considering the reaction sequence given below, the correct statement(s) is(are)

The moles of methane required to produce 81 g of water after complete combustion is _____ × 10^–2 mol. [nearest integer]

At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the half life was found to be 170 s. The order of the reaction is ________. [integer answer]

The electronic configuration of Pt(atomic number 78) is:

\(N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)\)
Consider the above reaction, the limiting reagent of the reaction and number of moles of NH₃ formed, respectively are :

2.2 g of nitrous oxide (N₂O) gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process, ΔU is ‘–x’ J. The value of ‘x’ is ____. [nearest integer]
(Given : atomic mass of N = 14 g mol^–1 and of O = 16 g mol^–1
Molar heat capacity of N₂O is 100 J K^–1 mol^–1)

The solubility of AgCl will be maximum in which of the following?

Among the given oxides of nitrogen; N₂O, N₂O₃, N₂O₄ and N₂O₅, the number of compound/(s) having N – N bond is:

Identify the incorrect statement from the following

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?
(A) NO
(B) N₂
(C) O₂
(D) C₂
(E) B₂
Choose the most appropriate answer from the options given below :

Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid?

Which one of the following compounds is inactive towards S_N1 reaction?

Which among the following is the strongest Bronsted base?

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is ______ B.M. (Nearest Integer)

For the reaction H₂F₂(g) → H₂(g) + F2(g), ΔU = –59.6 kJ mol^–1 at 27°C. The enthalpy change for the above reaction is (–) _______ kJ mol–1 [nearest integer] Given: R = 8.314 J K–1 mol^–1.

Decarboxylation of all six possible forms of diaminobenzoic acid \(C_6H_3(NH_2)2COOH\) yields three products A, B and C. Three acids give a product ‘A’, two acids give a product ‘B’ and one acid gives a product ‘C’. The melting point of product ‘C’ is

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

Which amongst the given plots is the correct plot for pressure \((p)\) vs density \((d)\) for an ideal gas?

In the structure of SF₄, the lone pair of electrons on S is in.

The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is