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Recent questions tagged class11

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

If $A(4,7,8),\:B(2,3,4),\:C(2,5,7)$ are vertices of a triangle then the length of internal bisector of angle $A$ is ?

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

Find the angle between any two diagonals of a cube.

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

If from a point $P(a,b,c)$ perpendiculars $PA,\:PB,\:$ are drawn on $yz\:\:and\:\:zx$ planes. then the equation of the plane $OAB$ is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

If the vertices of a triangle are $A(1,4,2),\:B(-2,1,2)\:C(2,-3,4)$ then the angle $B$ = ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The projection of a line segment on $x,y,z$ axes are $12,\:4,\:3$ respectively, then the length of the line segment is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The locus of a point $(x,y,z)$ for which $z=k$ is a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The points $(5,0,2),\:(2,-6,0),\:(4,-9,6)\:and\:(7,-3,8)$ represent vertices of a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

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

A line segment of length $21$ has $d.r.=(2,-3,6)$ and makes obtuse angle with $x\:axis$, then the components of the line segment (vector) are?

asked Jan 10, 2014 by rvidyagovindarajan_1

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

If $P(2,3,4)\;and\:Q(1,b,1)$ are two points and $O$ is origin such that $OP$ is $\perp$ to $OQ$, then $b=?$

asked Jan 10, 2014 by rvidyagovindarajan_1

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

The point which divides the line joining the points $(2,4,5)\:\:and\:\:(3,5,-4)$ in the ratio $2:3$ externaly lies on the plane?

asked Jan 10, 2014 by rvidyagovindarajan_1

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

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