List of top Chemistry Questions

Given that the radius of the first Bohr orbit of hydrogen atom is 53 pm, the radius of its third Bohr orbit is ................ pm. (Round off to the nearest integer)
The collision flux of a monoatomic gas on copper surface is \(3.0 \times 10^{18}\) m\(^-2\) s\(^{-1}\). Note that copper surface forms a square lattice with lattice constant of 210 pm. If the sticking coefficient of the atom with copper is 1.0, the time taken by the gas to form a complete monolayer on the surface is ................ s. (Round off to one decimal place)
A radioactive sample decays to 10% of its initial amount in 4600 minutes. The rate constant of this process is ................ hour\(^{-1}\). (Round off to two decimal places)
The ionization energy of hydrogen atom is 13.6 eV and the first ionization energy of sodium atom is 5.1 eV. The effective nuclear charge experienced by the valence electron of sodium atom is ................. (Round off to one decimal place)
In the structure of P\(_4\)O\(_{10}\), the number of P-O-P bond(s) is ................
The value of \(n\) for the complex [Fe(CO)\(_4\)(SiMe\(_3\))]^\(n\) satisfying the 18-electron rule is ................
Number of vertices in an icosahedral closo-borane is ................
The magnetic field strength required to excite an isolated proton to its higher spin state with an electromagnetic radiation of 300 MHz is ................ Tesla. (Round off to two decimal places)
\text{[Magnetogyric ratio of proton is } 26.75 \times 10^7 \text{ rad T}^{-1} \text{ s}^{-1}]
One liter of a buffer solution contains 0.004 mole of acetic acid (pK\(_a\) = 4.76) and 0.4 mole of sodium acetate. The pH of the solution is ................. (Round off to two decimal places)
The correct statement(s) among the following is/are
The bond order of N\(_2^+\) ion is ................. (Round off to one decimal place)
The correct statement(s) about NO$_2$, NO$_2^+$ and CO$_2$ is/are
The true statement(s) regarding the carbonic anhydrase enzyme is/are
The true statement(s) regarding the brown ring test carried out in the laboratory for the detection of NO\(_3^-\) is/are
The unit of the constant ‘a’ in van der Waals equation of state of a real gas can be expressed as
Among the following, microwave active molecule(s) is/are
The compound formed upon subjecting an aliphatic amine to Lassaigne’s test is
Among the following compounds, the one having the lowest boiling point is
The correct option having one complex from each of the following pairs which is more reactive towards the oxidative addition reaction by hydrogen molecule is
Among the following, the correct statement is
In qualitative inorganic analysis of metal ions, the ion which precipitates as sulfide in the presence of H$_2$S in warm dilute HCl is
The ratio of the nearest neighbor atomic distances in body-centered cubic (bcc) and face-centered cubic (fcc) crystals with the same unit cell edge length is
The correct statement regarding the observed magnetic properties of NO, O$_2$, B$_2$ and C$_2$ in their ground state is
The correct option for the number of bending modes of vibration in each of H$_2$O, CS$_2$, and SO$_2$ molecules, respectively, is
According to the kinetic theory of gases, the ratio of the root mean square velocity of molecular oxygen and molecular hydrogen at 300 K is