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Recent questions in Atomic Structure

Questions >> JEEMAIN and NEET >> Chemistry >> Atomic Structure

What electron transition in a hydrogen atom,starting from the orbit $n=7$ will produce infrared light of wavelength 2170nm?( $R_H=1.09677\times 10^7m^{-1})$

asked Jan 16, 2014 by sreemathi.v

1 answer

If uncertainties in the measurement of position and momentum are equal,calculate uncertainty in the measurement of velocity.

asked Jan 16, 2014 by sreemathi.v

1 answer

One quantum is absorbed per molecule of gaseous iodine for converting into iodine atoms.If light absorbed has wavelength of $5000A^{\large\circ}$,calculate energy required in KJ/mol.

asked Jan 16, 2014 by sreemathi.v

1 answer

Three isotopes of an element have mass numbers m,m+1 and m+2.If the mean mass number is ( m +0.5) then which of the following ratios may be accepted for m,(m+1) and (m+2) in that order

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate the uncertainty in velocity of an electron if uncertainty in its position is of the order of $1A^{\large\circ}$

asked Jan 16, 2014 by sreemathi.v

1 answer

An electron moves in an electric field with a kinetic energy of 2.5eV.What is the associated De-Broglie wavelength?

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate the accelerating potential that must be imparted to a proton beam to give it an effective wavelength of 0.005nm.

asked Jan 16, 2014 by sreemathi.v

1 answer

The energy E for an electron in H atom is $\large\frac{21.7\times 10^{-12}}{h^2}$erg.Calculate the energy required to remove electron completely from $n=2$ orbit.Also calculate the longest wavelength of light that can be used to cause this transition.

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate $\lambda$ of the radiations when the electrons jumps from III to II orbit for H atom.The electronic energy in II and III Bohr's orbit of H atom are $-5.42\times 10^{-12}$ and $-2.41\times 10^{-12}$erg respectively.

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the momentum of electron moving with $\large\frac{1}{3}$rd velocity of light

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the wavelength of moving electron having $4.55\times 10^{-25}$Joule of kinetic energy

asked Jan 15, 2014 by sreemathi.v

1 answer

Find out the number of waves made by a Bohr electron in one complete revolution in its third orbit

asked Jan 15, 2014 by sreemathi.v

1 answer

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 of $He^+$ spectrum ?

asked Jan 15, 2014 by sreemathi.v

1 answer

Estimate the difference in energy between first and second Bohr's orbit for a H atom.At what minimum atomic no a transition from $n=2$ to $n=1$ energy level would result in the emission of $X$-rays with $\lambda=3\times 10^8m$ ?which hydrogen atom like species does this atomic no corresponds to ?

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the energy emitted when electrons of 1.0g atom of hydrogen under go transition giving the spectral lines of lowest energy in the visible region of its atomic spectra.$R_H=1.1\times 10^7m^{-1},c=3\times 10^8msec^{-1}$ and $h=6.62\times 10^{-34}Jsec$

asked Jan 15, 2014 by sreemathi.v

2 answers

Calculate the wavelength of radiations emitted producing a line in Lyman series,when an electron falls from fourth stationary state in hydrogen atom $(R_H=1.1\times 10^7m^{-1})$

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the frequency of the spectral line emitted when the electron in n=3 in H-atom de-excites to ground state.$(R_H=109737/cm)$

asked Jan 15, 2014 by sreemathi.v

1 answer

Electromagnetic radiations of wavelength 242nm is just sufficient to ionize sodium atom.Calculate the ionization energy of sodium in KJ/mol.

asked Jan 15, 2014 by sreemathi.v

1 answer

The ionization energy of $He^+$ is $19.6\times 10^{-18}J/atom$.Calculate the energy of first stationary state of $Li^{2+}$

asked Jan 15, 2014 by sreemathi.v

1 answer

The ionization energy of H atom is $13.6eV$.What will be ionization energy of $He^+$ and $Li^{2+}$ ions?

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the velocity of an electron placed in $III$ orbit of H atom.Also calculate the no of revolution /sec round the nucleus.

asked Jan 15, 2014 by sreemathi.v

1 answer

Calculate the energy required to excite one litre of hydrogen gas at 1atm and 298K to the first excited state of atomic hydrogen.The energy for the dissociation of H-H bond is $463KJmol^{-1}$

asked Jan 15, 2014 by sreemathi.v

1 answer

A bulb emits light of $\lambda=4500A^{\circ}$ .The bulb is rated as 150watt and 8% of the energy is emitted as light.How many photons are emitted by the bulb per second?

asked Jan 15, 2014 by sreemathi.v

1 answer

Iodine molecule dissociates into atoms after absorbing light of 4500$A^{\circ}$ .If one quantum of radiation is absorbed by each molecule,calculate the kinetic energy of iodine atoms (Bond energy of $I_2=240KJmol^{-1}$)

asked Jan 15, 2014 by sreemathi.v

1 answer

The number of radial nodes of 3s and 2p orbitals are respectively

asked Jan 15, 2014 by sreemathi.v

1 answer

The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom

asked Jan 15, 2014 by sreemathi.v

1 answer

The quantum numbers $\large\frac{1}{2}$ and $-\large\frac{1}{2}$ for the electron spin represents :

asked Jan 15, 2014 by sreemathi.v

1 answer

If the nitrogen atom had electronic configuration $1s^7$,it would have energy lower than that of normal ground state configuration $1s^22s^22p^3$,because the electrons would be closer to the nucleus.Yet $1s^7$ is not observed because it violates

asked Jan 15, 2014 by sreemathi.v

1 answer

Number of nodal plane in px-orbital is

asked Jan 15, 2014 by sreemathi.v

1 answer

The wavelength of a golf ball weighing 200g and moving with a speed of 5m/h is of the order :

asked Jan 15, 2014 by sreemathi.v

1 answer

The electronic configuration of an element is $1s^2,2s^22p^6,3s^23p^63d^5,4s^1$.This represents its

asked Jan 15, 2014 by sreemathi.v

1 answer

The electrons,identified by quantum number n and l,(i) n=4,l=1;(ii) n=4,l=0;(iii) n=3,l=2;(iv) n=3,l=1 can be placed into order of increasing energy,from the lowest to highest,as :

asked Jan 15, 2014 by sreemathi.v

1 answer

The energy of an electron in the first orbit of H-atom is -13.6eV.The possible value of excited state for electron in bohr orbit of H atom are :

asked Jan 15, 2014 by sreemathi.v

1 answer

The first use of quantum theory to explain the structure of atom was given by

asked Jan 15, 2014 by sreemathi.v

1 answer

For a d electron,the orbital angular momentum is :

asked Jan 15, 2014 by sreemathi.v

1 answer

Which has maximum number of unpaired electron :

asked Jan 15, 2014 by sreemathi.v

1 answer

A 3p-orbital has :

asked Jan 13, 2014 by sreemathi.v

1 answer

Calculate the wavelength (in nanometer) associated with a proton moving $1.0\times 10^3ms^{-1}$ (mass of proton=$1.67\times 10^{-27}$kg and $h=6.63\times 10^{-34}Js)$

asked Jan 13, 2014 by sreemathi.v

1 answer

In an atom,an electron is moving with a speed of 600m/s with an accuracy of 0.005%.Certainly with which the position of the electron can be located is ($h=6.6\times 10^{-34}kg)m^2s^{-1}$.mass of electron,$e_m=9.1\times 10^{-31}kg)$

asked Jan 13, 2014 by sreemathi.v

1 answer

The ionization enthalpy of hydrogen atom is $1.312\times 10^6\;Jmol^{-1}$.The energy required to excite the electron in the atom from $n=1$ to $n=2$ is

asked Jan 13, 2014 by sreemathi.v

1 answer

Which of the following sets of quantum numbers represents the highest energy of an atom?

asked Jan 13, 2014 by sreemathi.v

1 answer

The "spin-only" magnetic moment [in units of Bohr magneton,$(\mu_B)$] of $Ni^{2+}$ in aqueous solution would be (Atomic no Ni=28)

asked Jan 13, 2014 by sreemathi.v

1 answer

Which one of the following sets of ions represents a collection of isoelectronic species?

asked Jan 13, 2014 by sreemathi.v

1 answer

Which of the following statement is correct in relation to the hydrogen atom?

asked Jan 13, 2014 by sreemathi.v

1 answer

In a multi-electron atom,which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic field.\[\] $\begin{array}{1 1}(i)\;n=1,l=0,m=0\\(ii)\;n=2,l=0,m=0\\(iii)\;n=2,l=1,m=1\\(iv)\;n=3,l=2,m=1\\(v)\;n=3,l=2,m=0\end{array}$

asked Jan 13, 2014 by sreemathi.v

1 answer

Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them

asked Jan 13, 2014 by sreemathi.v

1 answer

The wavelength of the radiations emitted,when in a hydrogen atom electron falls from infinity to stationary state is ($R_H=1.097\times 10^7m^{-1})$

asked Jan 13, 2014 by sreemathi.v

1 answer

The number of electrons with the azimuthal quantum number $l=1$ 1nd $l=2$ in ground state of $_{24}Cr$ is respectively :

asked Jan 13, 2014 by sreemathi.v

1 answer

Which set is correct for an electron in $4f-$orbital?

asked Jan 13, 2014 by sreemathi.v

1 answer

The De-Brogile wavelength of a tennis ball mass 60g moving with a velocity of 10m per second is approximately

asked Jan 13, 2014 by sreemathi.v

1 answer

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