List of top Chemistry Questions asked in JEE Main

The final product ‘C’ in the following series of reactions

Arrange the following carbocations in decreasing order of stability.
carbocations
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be
Refining using the liquation method is the most suitable for metals with:
The drug tegamet is:
Among the following which is the strongest oxidizing agent?
In neutral or faintly alkaline medium, KMnO4 being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be
The difference between spin only magnetic moment value of \([Co(H_2O)_6]Cl_2\) and \([Cr(H_2O)_6]Cl_3\) is ________ .

Match List-I with List-II:
 

List-I (Oxide)List-II (Nature)
(A) Cl2O7(I) Amphoteric
(B) Na2O(II) Basic
(C) Al2O3(III) Neutral
(D) N2O(IV) Acidic


Choose the correct answer from the options given below:

Which of the following is the correct plot for the probability density ψ2(r) as a function of distance ‘r’ of the electron from the nucleus for 2s orbital?

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The major product in the following reaction is:
 

Fig. Chemical Reaction
[Fe(CN)6]3– should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is (–) _____ Δ0. (Nearest integer)
The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to:

\((C_7H_5O_2)_2\stackrel{ℎv}{→} [X]→2C_6H_5+2CO_2\)
Consider the above reaction and identify the intermediate ‘X’

A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas ‘X’ with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

For the reaction given below:
\(CoCl_3.xNH_3 + AgNO_3 (aq) →\)
If two equivalents of AgCl precipitate out, then the value of x will be____.

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?
The correct sequential order of the reagents for the given reaction is
Amongst SF4, XeF4, CF4 and H2O, the number of species with two lone pair of electrons is _____.
The elevation in boiling point for 1 molal solution of non-volatile solute A is 3 K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of Kb and Kf i.e., \(\frac{K_b}{K_f}\) is 1 : X. The value of X is [nearest integer]
Given below are two statements:
Statement I : The non bio-degradable fly ash and slag from steel industry used by cement industry.
Statement II : The fuel obtained from plastic waste is lead free.
In the light of the above statements, choose the most appropriate answer from the options given below:
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?

Match List I with List II.

 List I List II
AZymaseIStomach
BDiastaseIIYeast
CUreaseIIIMalt
DPepsinIVSoyabean

Choose the correct answer from the options given below.

The energy of one mole of photons of radiation of wavelength \(300\) \(nm\) is (Given \(h\) = \(6.63 × 10^{–34}\)Js, \(N_A\) = \(6.02 × 10^{23}\) \(mol^{–1}\), \(c = 3 × 10^8\) \(ms^{–1}\))