List of top Chemistry Questions asked in JEE Main

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R 
Assertion: Magnetic moment of [Fe(H2O)6]3+ is 5.92 BM and that of [Fe(CN)6]3– is 1.73 BM 
Reason: Oxidation state of Fe in both the complexes is +3. 
In the light of the above statements, choose the correct answer from the options given below

The standard electrode potential of M^+/M in aqueous solution does not depend on

Match the terms in Column-I with their description in Column-II:

Column-I		Column-II
P	N2O5	(i)	N–N bond
Q	N2O	(ii)	N–O–N bond
R	N2O4	(iii)	N=N / N≡N bond
S	NO2	(iv)	N=O bond

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Radius of H⁺ is 1.5 × 10^–3 pm
Reason (R) : H⁺ cannot exist independently
In the light of the above statements, write the detailed answer:

The difference between electron gain enthalpies will be maximum between

Oxidation state of Cr in chromyl chloride is:

The homoleptic and octahedral complex of Co²⁺ and H₂O has___ set of orbitals. unpaired electron(s) in the t_2g set of orbitals.

The total change in the oxidation state of manganese involved in the reaction of KMnO₄ and potassium iodide in the acidic medium is______

20 mL of 0.5 M NaCl is required to coagulate 200 mL of As2S3 solution in 2 hours. The coagulating value of NaCl is____

For a reversible reaction A ⇌ B, the ΔH_{forward reaction} = 20 kJ mol^-1. The activation energy of the uncatalysed forward reaction is 300 kJ mol^-1. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at 27°C is found to be same as that of the uncatalysed reaction at 327°C. The activation energy of the cataysed backward reactoion is ____ kJ mol^-1.

Lowering of vapour pressure of 30% of aqueous solution of glucose. (in mmHg) 
Given: PH₂O = 760 mm of Hg

30.4 kJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK-1 mol-1 . atm The melting point of sodium chloride Calculate is ___ K(Nearest Integer).

The volume (in mL) of 0.1 M AgNO₃ required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of [Cr(H₂O)₅CI]Cl₂ as silver chloride is___

Which of the following statement is correct for paper chromatography?

Which is not true for arginine?

Match List I with List II:

List I - (Monomer)	List II - (Polymer)
(A) Tetrafluoroethene	(I) Orlon
(B) Acrylonitrile	(II) Natural rubber
(C) Caprolactam	(III) Teflon
(D) Isoprene	(IV) Nylon-6

Choose the correct answer from the options given below:

Consider the following sequence of reactions:

The product 'B' is

The Product formed in the following multistep reaction is

In the above conversion the correct sequence of reagents to be added is

Decreasing order of reactivity towards electrophilie substitution for the following compounds is

A' formed in the above reaction is

The complex with highest magnitude of crystal field splitting energy (Δ0) is

Number of P-O-P bonds in H₃PO₄, P₄O₁₀, (HPO₃)₃

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion (A): B_eCl₂ and MgCl₂ produce characteristic flame. 
Reason (R) : The excitation energy is high in B_eCl₂ and MgCl₂ 
In the light of the above statements, choose the correct answer from the option given below