List of top Chemistry Questions asked in JEE Main

Which of the following have a pyramidal shape ?

Among the following, species that have one unpaired electron:

Which of the following will not give Lassaigne's test?

Given below are two statements :
Statement-1: Aldol condensation is caused by acidity of a hydrogens.
Statement-2: Cross aldol is not possible between Ph-CHO and CH₃CHO
In the light of the above statements, choose the most appropriate answer from the options given below:

How many of the following compounds are sp³ hybridized

 \(\xrightarrow[Conc.HCL]{Zn-Hg}\) Product?

Which of the following is the correct order of first ionization enthalpy?

Among the following, decreasing order of basic strength will be:
OH^-, H^-, HCOO^-, CH₃COO^-, ^-OR
(I)     (II)    (III)         (IV)          (V)

For which of the following elements, only one oxidation state is possible?

If emf of hydrogen electrode at 25 ℃ is zero in pure water, then pressure of H₂ in bar is?

Which of the following has a maximum dipole moment?

Which of the following is the correct structure of L- Glucose

The conductivity of $0.02\mathrm{N}$ solution of a cell of $\mathrm{KCl}$ at ${25}^{\circ }\mathrm{C}$ is $2.765\times {10}^{-3}S{\mathrm{cm}}^{-1}$. If the resistance of a cell containing this solution is $4\times {10}^3$ ohm, what will be the cell constant?

The atomic masses of He and Ne are $4$ and $20$ a.m.u., respectively. The value of the de-Broglie wavelength of He gas at $-{73}^{\circ }C$ is "M" times that of the de-Broglie wavelength of $Ne$ at ${727}^{\circ }C.M$ is

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Experimental reaction of $CH _3 Cl$ with aniline and anhydrous $AlCl _3$ does not give $o$ and p-methylaniline.
Reason (R) : The $- NH _2$ group of aniline becomes deactivating because of salt formation with anhydrous $AlCl _3$ and hence yields $m$-methyl aniline as the product.
In the light of the above statements, choose the most appropriate answer from the options given below :

The radius of Na atom forming bcc lattice (in Å)?

Ba+2 cannot be precipitated as?

The correct increasing order of the magnitude of standard enthalpies of formation for group-1 halides is?

A naturally occurring amino acid that contains only one basic functional group.

A naturally occurring amino acid that contains only one basic functional group.

The ratio of the velocities of ${CH}_4$ and $O_2$ molecules, so that they are associated with de-Broglie waves of equal wavelength is: