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Recent questions tagged class11

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

In Bohr series of lines of hydrogen spectrum,third line from the red end corresponds to which one of the following inner orbit jumps of electron of Bohr orbit in atom of hydrogen

asked Jan 13, 2014 by sreemathi.v

1 answer

The orbital angular momentum for an electron resolving in an orbit is $\large\frac{h}{2\pi}$$\sqrt{l(l+1)}$.This momentum of a $s$-electron is :

asked Jan 13, 2014 by sreemathi.v

1 answer

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