List of top Chemistry Questions on Bohr’s Model for Hydrogen Atom

When the excited electron of a $H$ atom from $n =5$ drops to the ground state, the maximum number of emission lines observed are________

Radius of the 2^nd orbit of He⁺ is r₀. Radius of the 4^th orbit of Be³⁺ is xr₀. Find x.

According to Bohr's atomic theory :- (A) Kinetic energy of electron is $\propto \frac{ Z ^{2}}{ n ^{2}}$. (B) The product of velocity (v) of electron and principal quantum number (n), 'vn' $\propto Z ^{2}$. (C) Frequency of revolution of electron in an orbit is $\propto \frac{ Z ^{3}}{ n ^{3}}$. (D) Coulombic force of attraction on the electron is $\propto \frac{ Z ^{3}}{ n ^{4}}$. Choose the most appropriate answer from the options given below:

A particular station of All India Radio, New Delhi, broadcasts on a frequency of $1,368\, kHz$ (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light, $\left.c=3.0 \times 10^{8} ms ^{-1}\right]$

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 :

Among statements (a)-(d), the correct ones are: (a) Decomposition of hydrogen peroxide gives dioxygen. (b) Like hydrogen peroxide,compounds, such as $KClO_3, Pb (NO_3)_2$ and $NaNO_3$ when heated liberate dioxygen. (c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide. (d) Hydrogen peroxide is used for the manufacture of sodium perborate.

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

The time period of revolution of electron inits ground state orbit in a hydrogen atom is $1 .6 \times 10^{- 16}$ s. The frequency of revolution of the electron in its first excited state (in $s ^{- 1}$) is :

Deep sea divers use to respire a mixture of:

The angular speed of the electron in the $n^{th}$ orbit of Bohr hydrogen atom is

Number of visible lines in Balmer series.

Ionisation energy of $He^+$ is $19.6 \times 10^{-18}\, J$ atom$^{-1}$. The energy of the first stationary state $(n= 1)$ of $Li^{2+}$ is

Hydrogen peroxide oxidises $[Fe(CN)6]^{4-}$ to $[Fe(CN)6]^{3-}$ in acidic medium but reduces $[Fe(CN)6]^{3-}$ to$[Fe(CN)6]^{4-}$ in alkaline medium. The other products formed are, respectively

The ratio of lowest energy in terms of wave numbers of Balmer and Lyman series of lines of atomic spectrum of hydrogen is

The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol^-1, hence the energy of fourth Bohr orbit would be :

What are the products of auto-photolysis of water?

The difference between the radii of $n^{th}$ and $(n +1)^{th}$ orbits of hydrogen atom is equal to the radius of $(n -1)^{th}$ orbit of hydrogen. The angular momentum of the electron in the $n^{th}$ orbit is ________ ($h$ is Plank�s constant)

A light of frequency $1.6 \times 10^{16} \, Hz$ when falls on a metal plate emits electrons that have double the kinetic energy compared to the kinetic energy of emitted electrons when frequency of $1.0 \times 10^{16} \, Hz$ falls on the same plate. The threshold frequency $(v_0)$ of the metal in $Hz$ is

An example of non-stoichiometric hydride is

The following reactions show the $ H_{2}O_{2} $ behaviour in I and II reactions as: I. $ PbS(s) + 4 H_{2}O_{2} (aq) \to PbSO_{4}(s) + 4H_{2}O(l) $ II. $ HOC1 + H_{2}O_{2} \to H_{3}O^{+} + Cl^{-} + O_{2} $

The radius of the second Bohr orbit for hydrogen atom is: (Planck's Const. $h =6 . 6262 \times 10^{-34}\, Js$; mass of electron $=9 . 1091 \times 10^{-31}\, Kg$ charge of electron $e =1 .60210 \times 10^{-19} C$; permittivity of vacuum $\left.\left(\epsilon_{0}\right)=8 \cdot 854185 \times 10^{-12}\, Kg ^{-1}\, m ^{-3} A ^{2}\right)$

What is the actual volume occupied by water molecules present in $20 \, cm^3$ of water ?

The wavenumber of the first emission line in the Balmer series of H-Spectrum is: [$R=$ Rydberg constant]

Identify the incorrect statement regarding heavy water :