List of top Chemistry Questions asked in JEE Main

The number of alkali metal(s), from Li, K, Cs, $Rb$ having ionization enthalpy greater than $400\, kJ$ $mol ^{-1}$ and forming stable super oxide is

Which one of the following statements is incorrect?

The element playing significant role in neuromuscular function and interneuronal transmission is :

Formation of photochemical smog involves the following reaction in which $A , B$ and $C$ are respectively i $NO _2 \xrightarrow{ h\nu } A + B$ ii $B + O _2 \rightarrow C$ iii $A + C \rightarrow NO _2+ O _2$ Choose the correct answer from the options given below:

Given below are two statements:
Statement I : H₂O₂ is used in the synthesis of Cephalosporin
Statement II : H₂O₂ is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements, choose the most appropriate answer from the options given below :

Amongst the following compounds, which one is an antacid?

Caprolactam when heated at high temperature in presence of water, gives

Match List -I with List-II

LIST-I (Atomic number)	LIST-II (Block of periodic table)
(A) 37 (K)	I. p-block
(B) 78 (Pt)	II. d-block
(C) 52 (Te)	III. f-block
(D) 65 (Tb)	IV. s-block

Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning
In the light of the above statements, choose the correct answer from the options given below :

The normal rain water is slightly acidic and its $pH$ value is $56$ because of which one of the following ?

Which of the following compounds would give the following set of qualitative analysis?

Fehling's Test: Positive
Na fusion extract upon treatment with sodium nitroprusside gives a blood-red colour but not prussian blue

For $OF _2$ molecule consider the following : A Number of lone pairs on oxygen is 2 B FOF angle is less than $1045^{\circ}$ C Oxidation state of $O$ is $-2$ D Molecule is bent ' $V$ ' shaped E Molecular geometry is linear correct options are:

Which of the following is correct order of ligand field strength?

Lithium aluminium hydride can be prepared from the reaction of

Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic number $Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61$ )
A. $Sm$
B. $Eu$
C. $Tb$
D. $Gd$
E. $Pm$
Choose the correct answer from the options given below :

Boric acid is solid, whereas $BF _3$ is gas at room temperature because of

Graph of X-ray frequency (v)n v/s atomic number (Z) is linear. Find the value of n.

An $ \alpha $-particle, a proton, and an electron have the same kinetic energy. Which one of the following is correct in case of their De-Broglie wavelength:

Statement-I: Noradrenaline is one of the neurotransmitter.

Statement-II: Low level of noradrenaline is not cause of depression in humans.

In light of the above statements, choose the correct answer from the options given below

Match List I with List II:

LIST I (Type)	LIST II (Name)
(P) Antifertility drugs	(A) Norethindrone
(Q) Antihistamines	(B) Seldane
(R) Tranquilizers	(C) Meprobamate
(S) Antibiotics	(D) Penicillin

Choose the correct answer from the options given below:

Which of the following complex will show largest splitting of $d$-orbitals?

Number of unpaired electron in highest occupied molecular orbital of following species is :$N_2, N ^+_ 2 , O_2, O^+_ 2 $ ?

$[Co(NH_3)_6]^{3+} \text{is} $ ________$\text{hybridised and}$________

How many reactions are non-spontaneous at 300 K. For independent reaction ΔH & ΔS values are given.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature
Reason R: CO tends to get decomposed at higher temperature
In the light of the above statements, choose the correct answer from the options given below