List of top Chemistry Questions asked in JEE Main

Among the statements (A)-(D), the correct ones are : (a) Lithium has the highest hydration enthalpy among the alkali metals. (b) Lithium chloride is insoluble in pyridine. (c) Lithium cannot form ethynide upon its reaction with ethyne. (d) Both lithium and magnesium react slowly with $H_2O$ .

Cast iron is used for the manufacture of :

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) and (z) is :

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :

Kraft temperature is the temperature

Which of the following statement is not true for glucose?

The true statement amongst the following is :

If enthalpy of atomisation for $Br_{2(I)}$ is $x \,kJ/mol$ and bond enthalpy for $Br_2$ is $y\, kj/mol$, the relation between them :

The electronic configurations of bivalent europium and trivalent cerium are : (atomic number: $Xe = 54, Ce =58, Eu ??63$)

The major product formed in the following reaction is : $CH _{3} CH = CHCH \left( CH _{3}\right)_{2} \stackrel{ HBr }{\longrightarrow}$

Two monomers in maltose are :

The solubility product of $Cr(OH)_3$ at $298 \,K$ is $6.0 \times 10^{-31}.$ The concentration of hydroxide ions in a saturated solution of $Cr(OH)_3$ will be :

The correct name of the following polymer is :

The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are :

The C–C bond length is maximum in :

The correct statement is :

Among the following, the INCORRECT statement about colloids is :

Which of the given statements is INCORRECT about glycogen?

Heating of 2-chloro-1-phenylbutane with EtOK/EtOH gives X as the major product. Reaction of X with \(\mathrm{Hg(OAc)_2/H_2O}\) followed by \(\mathrm{NaBH_4}\) gives Y as the major product. Y is :

The molar solubility of Cd(OH)₂ is \(1.84 \times 10^{-5}\) M in water. The expected solubility of Cd(OH)₂ in a buffer solution of pH = 12 is :

Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO₂ and gaseous product. MnO₂ reacts with NaCl and concentrated H₂O₄ to give a pungent gas Z. X, Y and Z, respectively, are :

An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options :
Assertion (A) : Vinyl halides do not undergo nucleophilic substitution easily.
Reason (R) : Even though the intermediate carbocation is stabilized by loosely held p-electrons, the cleavage is difficult because of strong bonding.

What will be the major product when m-cresol is reacted with propargyl bromide (HC\(\equiv\)C–CH₂Br) in presence of K₂CO₃ in acetone?

The IUPAC name for the following compound is :

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :