List of top Chemistry Questions asked in JEE Main

2.5 g of protein containing only glycine (C2H5NO2) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03 × 10–3 bar. The total number of glycine units present in the protein is _______.
(Given : R = 0.083 L bar K–1 mol–1)
The amount of charge in F (Faraday) required to obtain one mole of iron from \(Fe_3O_4\) is ______ . (Nearest integer)
[A] → [B]
Reactant Product
If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x × 10–6 s–1. The value of x is _________. (Nearest Integer).
Among the following, basic oxide is:
The polymer, which can be stretched and retains its original status on releasing the force is
The intermediate X, in the reaction is:
The intermediate X, in the reaction
Which of the following reagents/reactions will convert ‘A’ to ‘B’?
reagents/reactions
The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF4, MnF3 and MnF2 is____ B.M. [nearest integer]
17.0 g of NH3 completely vapourises at – 33.42°C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol–1 . The enthalpy change for the vapourisation of 85 g of NH3 under the same conditions is ____ kJ.

The major product of the following reaction contains ______ bromine atom(s).

Fig
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is

The number of bridged oxygen atoms present in compound B formed from the following reactions is 

\(PB(NO_3)^2→(673 K)→A+PBO+O_2A→(Dimerise)B.\)

The number of terminal oxygen atoms present in the product B obtained from the following reaction is ______.
FeCr2O4 + Na2CO3 + O2 → A + Fe2O3 + CO2
A + H+ → B + H2O + Na+

The number of non-ionisable protons present in the product B obtained from the following reactions is__.
C2H5OH+PCl3→C2H5Cl+A
A+PCl3→B

Given below are the critical temperatures of some of the gases :

GasCritical temperature (K)
He5.2
CH4190.0
CO2304.2
NH3405.5

The gas showing least adsorption on a definite amount of charcoal is

The conductivity of a solution of complex with formula CoCl3(NH3)4 corresponds to 1 : 1 electrolyte, then the primary valency of central metal ion is ______.

Amongst the following, the major product of the given chemical reaction is

Amongst the following, the major product of

A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ________. (Nearest integer) (Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)
An antiseptic Dettol is a mixture of two compounds ‘A’ and ‘B’ where A has 6π electrons and B has 2π electrons. What is ‘B’?
Vulcanization of rubber is carried out by heating a mixture of

Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is,
Given : Atomic masses of C, H and N are 12, 1 and 14 amu, respectively. 
The molar mass of the compound A is 162g mol–1.

s-block element which cannot be qualitatively confirmed by the flame test is
Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: \(Mn = 25; Fe = 26\))
(1) \([FeF_6]^{3–}\)
(2) \([Fe(CN)_6]^{3–}\)
(3) \([MnCl_6]^{3–}\) (high spin)
(4) \([Mn(CN)_6]^{3–}\)
Consider, \(PF_5,BrF_5,PCl_3,SF_6,[ICl_4]^–,ClF_3 and\ IF_5\).
Amongst the above molecule(s)/ion(s), the number of molecule(s)/ion(s) having \(sp^3d^2\) hybridisation is _____.
Match List-I with List-II
 List I List II
A.Lyophilic colloidiLiquid-liquid colloid
B.EmulsioniiProtective colloid
C.Positively chargediii\(FeCl_3 + NaOH\)
D.Negatively chargediv\(FeCl_3 + hot\; water\)

Choose the correct answer from the options given below :