List of top Questions asked in JEE Main

One of the commonly used electrode is calomel electrode. Under which of the following categories calomel electrode comes ?

In Kjeldahl’s method for estimation of nitrogen, CuSO\(_4\) acts as:

Aluminium chloride in acidified aqueous solution forms an ion having geometry:

The incorrect statement regarding the geometrical isomers of 2-butene is:

Structure of 4-Methylpent-2-enal is

Salicylaldehyde is synthesized from phenol, when reacted with

The electronic configuration of Einsteinium is :(Given atomic number of Einsteinium = 99)

Phenolic group can be identified by a positive

In the following sequence of reaction, the major products B and C respectively are :

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a:

The interaction between π bond and lone pair of electrons present on an adjacent atom is responsible for

Match List-I with the List-II

List-I (Compound / Species)	List-II (Shape / Geometry)
(A) \(SF_4\)	(I) Tetrahedral
(B) \(BrF_3\)	(II) Pyramidal
(C) \(BrO_{3}^{-}\)	(III) See saw
(D) \(NH^{+}_{4}\)	(IV) Bent T-shape

Choose the correct answer from the options given below:

Identify the following species in which \(d^2sp^3\) hybridization is shown by the central atom.

Which of the following compounds in 3d series does not show +3 oxidation state?

In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

In the above chemical reaction sequence “A’’ and “B” respectively are :

The quantity which changes with temperature:

Match List I with List II

Choose the correct answer from the options given below :

Identify A and B in the given chemical reaction sequence : -

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The stability order of \(+1\) oxidation state of Ga, In, and Tl is \( \text{Ga}<\text{In}<\text{Tl} \).
Reason R: The inert pair effect stabilizes the lower oxidation state down the group.
In the light of the above statements, choose the correct answer from the options given below:

Which one of the following reactions is NOT possible?

Choose the correct option having all the elements with \( d^{10} \) electronic configuration from the following:

The correct arrangement for decreasing order of electrophilic substitution for above compounds

Given below are two statements:
Statement (I) : S$_N$2 reactions are 'stereospecific', indicating that they result in the formation only one stereo-isomers as the product.
Statement (II) : S$_N$1 reactions generally result in formation of product as racemic mixtures.
In the light of the above statements, choose the correct answer from the options given below :

In acidic medium, \( K_2Cr_2O_7 \) shows oxidizing action as represented in the half-reaction: \(Cr_2O_7^{2-} + XH^+ + Ye^- \rightarrow 2A + ZH_2O\)
\( X \), \( Y \), \( Z \), and \( A \) are respectively: