List of top Chemistry Questions asked in JEE Main

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.

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: