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Recent questions tagged physical-chemistry

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

The number of d-electrons retained in $Fe^{2+}$ ion is :

asked Jan 13, 2014 by sreemathi.v

1 answer

Which has the maximum magnetic moment

asked Jan 13, 2014 by sreemathi.v

1 answer

Uncertainty in position of a minute particle of mass 25g in space is $10^{-5}$m.The uncertainty in its velocity (in $ms^{-1})$ is

asked Jan 13, 2014 by sreemathi.v

1 answer

In a hydrogen atom,if energy of an electron in ground state is -13.6eV,then that in the $2^{nd}$ excited state is :

asked Jan 13, 2014 by sreemathi.v

1 answer

The quantum number that does not describe the distance and the angular disposition of the electron

asked Jan 13, 2014 by sreemathi.v

1 answer

Kcrypon ($36_Kr)$ has the electronic configuration $(_{18}Ar)4s^23d^{10}4p^6$,the $37^{th}$ electron will go into which of the following subshells?

asked Jan 13, 2014 by sreemathi.v

1 answer

The electronic configuration $1s^2,2s^2p^6,3s^13p^1$ correctly describes :

asked Jan 13, 2014 by sreemathi.v

1 answer

An ion with 18 electrons in the outermost shell is :

asked Jan 13, 2014 by sreemathi.v

1 answer

Among the following series of transition metals ions,the one where all metal ions have $3d^2$ electronic configuration is

asked Jan 13, 2014 by sreemathi.v

1 answer

Which of the following statement is (are) correct ?

asked Jan 10, 2014 by sreemathi.v

1 answer

Which atom has as many as s-electron and p-electrons?

asked Jan 10, 2014 by sreemathi.v

1 answer

In which electronic level,the H atom can absorb the photon but cannot emit a photon?

asked Jan 10, 2014 by sreemathi.v

1 answer

In potassium atom,electronic energylevel is in the order:

asked Jan 10, 2014 by sreemathi.v

1 answer

Out of first 100 elements,number of elements having electrons in 3d-orbitals are

asked Jan 10, 2014 by sreemathi.v

1 answer

Which will be the most stable among $Cu^{+},Fe^+,Fe^{2+}$ and $Fe^{3+}$

asked Jan 10, 2014 by sreemathi.v

1 answer

Determine the element of lowest atomic number that contains a complete d subshell in the ground state.

asked Jan 10, 2014 by sreemathi.v

1 answer

In ground state of $_{24}Cr$

asked Jan 10, 2014 by sreemathi.v

1 answer

How many unpaired electrons are there in $Ni^{2+}$

asked Jan 10, 2014 by sreemathi.v

1 answer

The magnetic moment of electron in an atom(excluding orbital magnetic moment) is given by

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following ions has the highest magnetic moment ?

asked Jan 10, 2014 by sreemathi.v

1 answer

Magnetic moment of $Fe^{a+}(z=26)$ is $\sqrt{24}$BM.Hence number of unpaired electrons and value of a respectively are :

asked Jan 10, 2014 by sreemathi.v

1 answer

Magnetic moments of $V(Z=23), \;Cr(Z=24),\;Mn(Z=25)$ are $x,\;y,\;z$ , respectively. Hence,

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following has the maximum number of unpaired electrons?

asked Jan 10, 2014 by sreemathi.v

1 answer

Which is correct paramagnetic order?

asked Jan 10, 2014 by sreemathi.v

1 answer

The correct ground state electronic configuration of chromium atom is

asked Jan 10, 2014 by sreemathi.v

1 answer

Which electronic level would allow a H-atom to absorb a photon but not to emit a photon ?

asked Jan 10, 2014 by sreemathi.v

1 answer

Which subshell has maximum energy (polyelectronic system)?

asked Jan 10, 2014 by sreemathi.v

1 answer

The number of d-electrons present in $Fe^{2+}$ is

asked Jan 10, 2014 by sreemathi.v

1 answer

Total number of nodal planes are same in

asked Jan 10, 2014 by sreemathi.v

1 answer

Which orbital is nearest to the nucleus?

asked Jan 10, 2014 by sreemathi.v

1 answer

Assuming the velocity to be same,which sub-atomic particle possesses smallest de-Brogile wavelength

asked Jan 10, 2014 by sreemathi.v

1 answer

If the total energy of an electron in a hydrogen like atom in an excited state is -3.4eV then the debroglie wavelength of the electron is

asked Jan 10, 2014 by sreemathi.v

1 answer

The work function for a metal is 4eV.To emit a photon-electron of zero velocity from the surface of the metal,the wavelength of incident light should be

asked Jan 10, 2014 by sreemathi.v

1 answer

Photoelectric effect shows :

asked Jan 10, 2014 by sreemathi.v

1 answer

The study of photoelectric effect is useful in understanding :

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following does not characterized X-rays?

asked Jan 10, 2014 by sreemathi.v

1 answer

A photon of 300nm is observed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm, the wavelength of second re-emitted photon is

asked Jan 10, 2014 by sreemathi.v

1 answer

Suppose $10^{-17}J$ of light energy is needed by the interior of human eye to see an object .The photons of green light ($\lambda =550nm)$ needed to see the object are :

asked Jan 10, 2014 by sreemathi.v

1 answer

The maximum sum of the number of neutrons and protons in an isotope of hydrogen is

asked Jan 10, 2014 by sreemathi.v

1 answer

The ratio between the neutrons present in carbon and silicon with respect to mass number of 12 and 28 respectively is

asked Jan 10, 2014 by sreemathi.v

1 answer

The total number of fundamental particles in one atom of $_6 C ^{14}$ is

asked Jan 10, 2014 by sreemathi.v

1 answer

For which of the following process energy is absorbed?

asked Jan 9, 2014 by sreemathi.v

1 answer

Heavy water molecule made from $_2 H ^3$ and $O ^{18}$ has a molecular weight of

asked Jan 9, 2014 by sreemathi.v

1 answer

The ratio of specific charge (e/m) of a proton to that of an $\alpha$-particle is :

asked Jan 9, 2014 by sreemathi.v

1 answer

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