List of top Chemistry Questions asked in JEE Main

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is
Hydrolysis of which compound will give carbolic acid?
Fig.

Considering the above reactions, the compound ‘A’ and compound ‘B’ respectively are :

Arrange the following in increasing order of reactivity towards nitration 
A. p-xylene 
B. bromobenzene 
C. mesitylene 
D. nitrobenzene 
E. benzene
Product ‘A’ of the following sequence of reactions is                                       
\(Ethylbenzene \xrightarrow[{(b)Cl_2,Δ;(c) alc.KOH}]{ (a)Br_2,Fe }\)‘ \(\;  \;\; \;\;A′\\major Product\)

Consider the above reaction and predict the major product.

Consider the above reaction and predict the major product.

Given below are two statements.

Statement I : Phenols are weakly acidic.

Statement II : Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water.

Choose the most appropriate option.

The correct IUPAC name of the following compound is:

Fig.
Two elements \(A\) and \(B\) which form \(0.15\) moles of \(A_2B\) and \(AB_3\) type compounds. If both \(A_2B\) and \(AB_3\) weigh equally, then the atomic weight of \(A\) is _____ times of atomic weight of \(B\).

The major product formed in the following reaction, is

If \([Cu(H_2O)_4]^{2+}\) absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [\(Cu(H_2O)_6]^{2+}\) will be _______ \(×10^{–21} J\). [Nearest integer]
(Given : h = \(6.63 × 10^{–34} Js\) and \(c = 3.08×10^8 ms^{–1}\))

In bromination of Propyne, with Bromine 1,1,2,2-tetrabromopropane is obtained in 27% yield. The amount of 1,1,2,2-tetrabromopropane obtained from 1 g of Bromine in this reaction is _______ × 10–1 g. (Nearest integer)
(Molar Mass : Bromine = 80 g/mol)
In the estimation of bromine, 0.5 g of an organic compound gave 0.40 g of silver bromide. The percentage of bromine in the given compound is _____% (nearest integer)
(Relative atomic masses of Ag and Br are 108 u and 80 u, respectively).
The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

For the given reactions
Sn2+ + 2e– → Sn
Sn4+ + 4e– → Sn
the electrode potentials are;
\(E^{∘}_{Sn^{2+}/Sn}=−0.140V \) and \(E^{∘}_{Sn^{4+}Sn} =−0.010 V.\)
The magnitude of standard electrode potential for \(Sn^{4+}/Sn^{2+}\) i.e.
\(E^{∘}_{Sn^{4+}/Sn^{2+}}\)
is _________ × 10–2 V. (Nearest integer)

Consider the following reaction sequence:

The product ‘B’ is:

If the uncertainty in velocity and position of a minute particle in space are, \(2.4 × 10^{–26}\) \((m s^{–1)}\) and \(10^{–7} (m)\), respectively. The mass of the particle in g is _____ . (Nearest integer)
(Given : \(h = 6.626 × 10^{–34} Js\))

Consider an imaginary ion \(\\_{22}^{48}X^{3−}\).The nucleus contains ‘a’% more neutrons than the number of electrons in the ion. The value of ‘a’ is ________. [nearest integer
For a reaction \(A → 2B + C\) the half lives are 100 s and 50 s when the concentration of reactant A is 0.5 and 1.0 mol L–1, respectively. The order of the reaction is ______ .(Nearest integer)
The pair, in which ions are isoelectronic with \(Al^{3+}\) is:

Match List-I with List-II.

List-IList-II
(A)N2(g) + 3H2(g) \(\rightarrow\) 2NH3(g)(I)Cu
(B)CO(g) + 3H2(g) \(\rightarrow\) CH4(g) + H2O(g)(II)Cu/ZnO – Cr2O3
(C)CO(g) + H2(g) \(\rightarrow\)HCHO(g)(III)FexOy + K2O + Al2O3
(D)CO(g) + 2H2(g) \(\rightarrow\) CH3OH(g)(IV)Ni


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: Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.
Reason R: Phenolphthalein is a weak acid. It doesn’t dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below.
Which of the following methods are not used to refine any metal?
  1. Liquation
  2. Calcination
  3. Electrolysis
  4. Leaching
  5. Distillation
Choose the correct answer from the options given below :
Which of the following reactions will yield benzaldehyde as a product?
reactions will yield benzaldehyde as a product
The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture, contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is \(\frac {x}{17}\). The value of x is _____.