List of top Chemistry Questions asked in JEE Main

Amongst the following, the most basic compound is:
Phenol on reduction with H2 in the presence of Ni catalyst gives:
Which substance is produced when alcohol is added with petrol and used as a fuel?
An aromatic compound 'A' C7H6Cl2  gives white precipitate on boiling with AgNO3 solution and yields C7H7OCl on treatment with NaOH.  'A' on oxidation gives a monochloro benzoic acid which affords only one mononitroderivative.  The compound A is:
The shapes of the compounds XeF2, XeF4, XeO3 and XeO4 respectively are:

Directions: The answer to the following question is a single digit integer ranging from 0 to 9. Enter the correct digit in the box given below.

How many open chain structures are possible for N-Methly butanamine (including it) that are referred to as metamers.

Which of the following are amongst the few carbon-containing compounds NOT classified as organic?
Resonance in carbonate ion $\left( CO _3{ }^{2-}\right)$ is
Which of the following is true?
At equilibrium the concentrations of N2=3.0×10−3M,O2=4.2×10−3M and NO=2.8×10−3M in a sealed vessel at 800 K. What will be KC for the reaction N2( g)+O2( g)⇋2NO(g)?
The correct order of atomic radii is:
The enthalpy of vaporisation of a substance is 8400 J mol−1 and its boiling point is −173.15∘C. The entropy change for vaporisation is:
If the ionisation potential of the hydrogen atom is 13.6eV, then what will be the longest wavelength needed to remove an electron from the 1st  Bohr's orbit of He+ ion?
Given:
(i) Cu2++2e−→Cu,E0=0.337 V
(ii) Cu2++e−→Cu+,E0=0.153
Standard electrode potential, E∘ for the reaction, Cu+e−→Cu, will be (in volts):

Chemical A is used for water softening to remove temporary hardness, A reacts with Na2Co3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. If  the chemical formula of A is \(Ca (OH)_{2} + CO_{2}  \rightarrow  CaCo_{?}  \downarrow + H_{2}O   \)  then what is the value of ?

In the following reaction, ' $A$ ' is
 

Hydrogen ion concentration of an aqueous solution is 1 × 10-4 M.  The solution is diluted with equal volume of water.  Hydroxyl ion concentration of the resultant solution in terms of p×10-10 mol dm-3 . What is the value of p?
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$
Assertion A : Hydrogen is an environment-friendly fuel
Reason R : Atomic number of hydrogen is 1 and it is a very light element
In the light of the above statements, choose the correct answer from the options given below

Match List I with List II

List IList II
ASlaked limeI$NaOH$
BDead burnt plasterII$Ca(OH)_2$
CCaustic sodaIII$Na_2CO_3 10H_2O$
DWashing sodaIV$CaSO_4$

Choose the correct answer from the options given below:

How can photochemical smog be controlled?
Given below are two statements:
Statement I : Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode
Statement II : Chemical reactivity of an element can be determined by its reaction with oxygen and halogens
In the light of the above statements, choose the correct answer from the options given below
Choose the correct statement(s):
A Beryllium oxide is purely acidic in nature
B Beryllium carbonate is kept in the atmosphere of $CO _2$
C Beryllium sulphate is readily soluble in water
D Beryllium shows anomalous behavior
Choose the correct answer from the options given below:
Product B is:
ethoxy benzene reacts with HNO3/H2SO4
Match the column.
Column-I
(Compounds)		Column-II
(Configurations)
A.TiCl4(1)e3t23
B.FeO42-(2)e2t20
C.FeCl42-(3)e2t23
D.MnCl42-(4)e0t20
Consider the following reaction: The product is
hydrocarbons
Find out value of $C_p/C_y$ for an ideal gas undergoing reversible adiabatic process for which $P ∝ T^3$ is given