List of top Chemistry Questions on General Chemistry asked in JEE Main

The correct increasing order of spin-only magnetic moment values of the complex ions:

[MnBr4]2− (A),
[Cu(H2O)6]2+ (B),
[Ni(CN)4]2− (C), and
[Ni(H2O)6]2+ (D)

is:

Identify the correct statements: The presence of –NO\(_2\) group in benzene ring A. activates the ring towards electrophilic substitutions. B. deactivates the ring towards electrophilic substitutions. C. activates the ring towards nucleophilic substitutions. D. deactivates the ring towards nucleophilic substitutions. Choose the correct answer from the options given below:

Consider the following aqueous solutions. I. 2.2 g Glucose in 125 mL of solution. II. 1.9 g Calcium chloride in 250 mL of solution. III. 9.0 g Urea in 500 mL of solution. IV. 20.5 g Aluminium sulphate in 750 mL of solution. The correct increasing order of boiling point of these solutions will be: [Given: Molar mass in g mol\(^{-1}\): H = 1, C = 12, N = 14, O = 16, Cl = 35.5, Ca = 40, Al = 27 and S = 32]

The wavelength of photon 'A' is 400 nm. The frequency of photon 'B' is \(10^{16}\,\text{s}^{-1}\). The wave number of photon 'C' is \(10^{5}\,\text{cm}^{-1}\). The correct order of energy of these photons is:

Given below are two statements: Statement I: The increasing order of boiling point of hydrogen halides is HCl<HBr<HI<HF. Statement II: The increasing order of melting point of hydrogen halides is HCl<HBr<HF<HI. In the light of the above statements, choose the correct answer from the options given below:

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

Match List - I with List - II according to shape. List - I A. XeO\(_3\) B. XeF\(_2\) C. XeO\(_2\)F\(_2\) D. XeOF\(_4\) List - II I. BrF\(_5\) II. NH\(_3\) III. [I\(_3\)]\(^{-}\) IV. SF\(_4\) Choose the correct answer from the options given below:

Consider the following statements about manganate and permanganate ions. Identify the correct statements. A. The geometry of both manganate and permanganate ions is tetrahedral. B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively. C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product. D. Manganate ion is paramagnetic and permanganate ion is diamagnetic. E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.

For a strong electrolyte, molar conductivity increases slowly with dilution and can be represented by the equation:
Lambda_m = Lambda_m(0) − A × square root of c

Molar conductivity values of solutions of strong electrolyte AB at 18 degree Celsius are given below:

Concentration (mol L-1): 0.04 , 0.09 , 0.16 , 0.25
Molar conductivity (S cm2 mol-1): 96.1 , 95.7 , 95.3 , 94.9

The value of constant A based on the above data [in S cm2 mol-1 per (mol L-1)1/2] is: