List of top Chemistry Questions asked in JEE Main

Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration ?
Calamine is an ore of :
For the equilibrium, \(\mathrm{A(g) \rightleftharpoons B(g)}\), \(\Delta H\) is \(-40\) kJ/mol. If the ratio of the activation energies of the forward (\(E_f\)) and reverse (\(E_b\)) reactions is \(\frac{2}{3}\) then :
The increase of pressure on ice \(\rightleftharpoons\) water system at constant temperature will lead to :
Molecule AB has a bond length of 1.617 \(\mathrm{\AA}\) and a dipole moment of 0.38 D. The fractional charge on each atom (absolute magnitude) is : (\(e_0 = 4.802\times10^{-10}\) esu)
Match the polymers in column-A with their main uses in column-B and choose the correct answer:
Column - AColumn - B
A. Polystyrenei. Paints and lacquers
B. Glyptalii. Rain coats
C. Polyvinyl chlorideiii. Manufacture of toys
D. Bakeliteiv. Computer discs
The correct order of basicity is

(structure: benzene ring with \(\mathrm{OCOCH_3}\) and \(\mathrm{COOH}\) on adjacent carbons, i.e. acetylsalicylic acid) is used as:

(the dipotassium salt of 1,4-dihydronaphthalene-1,4-dicarboxylic acid, with COOK at both sp3 ring carbons) \(\xrightarrow{\text{Electrolysis}}\) A
A is :
In the presence of a small amount of phosphorous, aliphatic carboxylic acid reacts with chlorine or bromine to yield a reaction in which, \(\alpha\)-hydrogen is been replaced by halogen. This reaction is known as
Which molecule/ion among the following cannot act as a ligand in complex compounds?
The correct statement on the isomerism associated with the following complex ions.
(a) \(\mathrm{[Ni(H_2O)_5NH_3]^{2+}}\)
(b) \(\mathrm{[Ni(H_2O)_4(NH_3)_2]^{2+}}\) and
(c) \(\mathrm{[Ni(H_2O)_3(NH_3)_3]^{2+}}\) is:
An aqueous solution of a salt X turns blood red on treatment with \(\mathrm{SCN^-}\) and blue on treatment with \(\mathrm{K_4[Fe(CN)_6]}\). X also gives a positive chromyl chloride test. The salt X is:
In the isolation of metals, calcination process usually results in:
The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:
The cation that will not be precipitated by \(\mathrm{H_2S}\) in the presence of dil HCl is:
A variable, the opposite external potential (\(E_{ext}\)) is applied to the cell \(\mathrm{Zn \mid Zn^{2+}\ (1\ M) \parallel Cu^{2+}\ (1\ M) \mid Cu}\), of potential 1.1 V. When \(E_{ext} \lt 1.1\) V and \(E_{ext} \gt 1.1\) V, respectively electrons flow from
1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10 \(\mathrm{H_2SO_4}\) solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is:
A compound A with molecular formula \(\mathrm{C_{10}H_{13}Cl}\), gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis, gives C and D. C gives Cannizzaro reaction, but not aldol condensation. D gives aldol condensation, but not Cannizzaro reaction. A is
The reaction \(\mathrm{2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)}\) follows first order kinetics. The pressure of a vessel containing only \(\mathrm{N_2O_5}\) was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :
The optically inactive compound from the following is:
Which of the following is not an assumption of the kinetic theory of gases?
The heat of atomization of methane and ethane are \(360\ \mathrm{kJ\ mol^{-1}}\) and \(620\ \mathrm{kJ\ mol^{-1}}\), respectively. The longest wavelength of light capable of breaking the C \(-\) C bond is (Avogadro's number = \(6.023 \times 10^{23}\), \(h = 6.62 \times 10^{-34}\ \mathrm{J\ s}\))
If the principal quantum number n = 6, the correct sequence of filling of electrons will be:
The shape of \(\mathrm{XeOF_4}\) by VSEPR theory is: