List of top Chemistry Questions asked in JEE Main

Given below are two statements :

In the light of the above statements, choose the most appropriate answer from the options given below :

The number of optically active products obtained from the complete ozonolysis of the given compound is :

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : $ [Fe(CN)_6]^{3-}, [FeF_6]^{3-}, [CoF_6]^{3-}, [Mn(CN)_6]^{3-} $

In $ SO_2 $, $ NO_2^- $ and $ N_3^- $ the hybridizations at the central atom are respectively :

Match List-I with List-II

Choose the correct answer from the options given below :

The descending order of basicity of following amines is :

Choose the correct answer from the options given below :

'X' is the number of acidic oxides among $ VO_2, V_2O_3, CrO_3, V_2O_5 $ and $ Mn_2O_7 $. The primary valency of cobalt in $ [Co(H_2NCH_2CH_2NH_2)_3]_2 (SO_4)_3 $ is Y. The value of X + Y is :

Liquid A and B form an ideal solution. The vapour pressure of pure liquids A and B are 350 and 750 mm Hg respectively at the same temperature. If $ x_A $ and $ x_B $ are the mole fraction of A and B in solution while $ y_A $ and $ y_B $ are the mole fraction of A and B in vapour phase then :

The correct statement amongst the following is :

Match List-I with List-II

Choose the correct answer from the options given below :

Choose the incorrect trend in the atomic radii (r) of the elements :

"P" is an optically active compound with molecular formula $ C_6H_{12}O $. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of "P".

A(g) $ \rightarrow $ B(g) + C(g) is a first order reaction.

The reaction was started with reactant A only. Which of the following expression is correct for rate constant k ?

The hydration energies of $ K^+ $ and $ Cl^- $ are $ -x $ and $ -y $ kJ/mol respectively. If lattice energy of KCl is $ -z $ kJ/mol, then the heat of solution of KCl is :

Mixture of 1 g each of chlorobenzene, aniline and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel, 5 M NaOH (30 mL) was added in the same funnel. The funnel was shaken vigorously and then kept aside. The ethyl acetate layer in the funnel contains :

Given below are two statements :
Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of $ \alpha $-amino acids while proteins give rise to a large number of $ \beta $-amino acids.
Statement (II) : Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form.
In the light of the above statements, choose the most appropriate answer from the options given below :

The complex of Ni$^{2+}$ ion and dimethyl glyoxime contains ____ number of Hydrogen (H) atoms.

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is ___ x $ 10^{-2} $ M. (Nearest integer)

Consider the following cases of standard enthalpy of reaction ($ \Delta H_f^\circ $ in kJ mol$^{-1}$): \[ \text{C}_2\text{H}_6(g) + 7 \text{O}_2(g) \rightarrow 2 \text{CO}_2(g) + 3 \text{H}_2\text{O}(l) \quad \Delta H_1^\circ = -1550 \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}_2(g) \quad \Delta H_2^\circ = -393.5 \] \[ \text{H}_2(g) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{H}_2\text{O}(g) \quad \Delta H_3^\circ = -286 \] The magnitude of $ \Delta H_f^\circ $ of $ \text{C}_2\text{H}_6(g) $ is ____ kJ mol$^{-1}$ (Nearest integer).

The compound with molecular formula C$_6$H$_6$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ___ $\pi$ electrons.

The species which does not undergo disproportionation reaction is:

Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4d orbitals. The value of $ x + y $ is:

The maximum covalency of a non-metallic group 15 element 'E' with the weakest E-E bond is:

Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is: