List of top Chemistry Questions asked in JEE Main

Which of the following is true regarding coagulation of egg:
From the given information, calculate enthalpy of formation of 2 moles of $C_6H_6$(l) at 25°C. Given: $CH(C_6H_6$(l)) = –3264.6 kJ/mol $CH(C(s))$ = –393.5 kJ/mol $fH(H_2O(l))$ = –285.83 kJ/mol
The molarity of NaCl solution is 3 M. Calculate the morality of the solution. (Given density of the solution = 1.25 g/mL)
Find out E cell of the given cell M | M2+ | | x2-|x.|
EºM2+I M = 0.34 V
E°x|x2- = 0.46 V
Which of the following d-block elements has maximum unpaired electron in ground state electronic configuration?
Find out the shortest wavelength of paschen series for H- atom
If Ksp of Ag2CO3 is 8×10−12, the molar solubility of Ag2CO3 in 0.1MAgNO3 is:
At 25∘C, the solubility product of Mg(OH)2 is 1.0×10−11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001MMg2+ ions ?
Highest oxidation state of $Mn$ is exhibited in $Mn _2 O _7$ The correct statements about $Mn _2 O _7$ are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) $Mn$ is octahedrally surrounded by oxygen atoms
(C) Contains $Mn-O-Mn$ bridge
(D) Contains $Mn - Mn$ bond
Choose the correct answer from the options given below:
Which of the following statement is incorrect-
We have two complexes, [Fe(H2O)6]2+ and [Cu(H2O)6]2+ , the magnetic properties respectively are
For a certain reaction, ΔHr is 400 kJ/mol and ΔS=0.2 kJ/mol K. Above what minimum temperature in Kelvin, the reaction becomes spontaneous.
IUPAC name of complex compound [Pt(Br)2(PPh3)2].
Consider following statements.
S1: IUPAC name is IUPAC name is 4-chloro-1,3-dinitrobenzene
S2: IUPAC name is IUPAC name is 2-methylaniline
Identify the product formed in the following reaction:
aqueous sodium hydroxide (NaOH)
Among the following anions, identify the anion which gives pale yellow precipitate with aq. AgNO3. The precipitate is partially soluble in aq. NH4OH solution.

If the initial pressure of a gas is 0.03 atm, the mass of the gas adsorbed per gram of the adsorbent is ______ × 10–2 g.

2 g of a base whose equivalent weight is 40 reacts with 3g of an acid. The equivalent weight of the acid is:
For a reaction, \({A \rightleftharpoons P}\), the plots of [A] and [P] with time at temperatures \(T_1\) and \(T_2\) are given below. If \(T_2 > T_1\), the correct statement(s) is (are) (Assume \(\Delta H^{\ominus}\) and \(\Delta S^{\ominus}\) are independent of temperature and ratio of lnK at \(T_1\) to lnK at \(T_2\) is greater than \(\frac{T_2}{T_1}\) . Here \(H, S, G\) and \(K\) are enthalpy, entropy, Gibbs energy and equilibrium constant, respectively.)

What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at 
Thermoplastics are:
The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are:
The number of isomeric forms that are represented by C7H9N is:
Nitrogen has no d-orbital in its valence shell and therefore it cannot1) Exhibits the oxidation state of +52) Have covalency greater than 33) Exhibit orbital Hybridization4) Form oxides with oxidation states greater than +5Select the correct answer using codes given below: