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Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

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

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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

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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

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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

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

asked Jan 13, 2014 by sreemathi.v

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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

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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

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