Introduction to Quantum Mechanical Model

Q.

What will be the wavelength of a ball of mass 0.1 kg moving with a velocity of $10m{s}^{-1}$?

1. 6.6× 10^-34 m

2. 7.8× 10^-40 m

3. 8.7× 10^-30 m

4. None of these

Q. The probability density curve for 2s electron appears like

Q.

If the binding energy of 2nd excited state of a hydrogen like sample is 24 eV approximately, then the ionization energy of the sample is approximately:

1. 122.3 eV

2. 216 eV

3. 24 eV

4. 54.4 eV

Q. 39. The total number of orbitals in a shell with Principal quantum number n is

Q. What is the energy order of orbitals of uni-electronic species?

Q. 94.What is maximum number of degenerate orbitals in 3rd excited state of Li+2 ?

Q.

The uncertainty principle was enunciated by

1. Einstein

2. Heisenberg

3. Rutherford

4. Pauli

Q. What is the order of filling of electrons in molecular orbital for NO, N_2, O_2?

Q. 30. An electron initially present in an excited state of H atom is further excited to another energy level by an incident photon. It releases 10 photons while coming back to ground state out of which 7 have higher energy than incident photon. In which excited state was the electron present initially?

Q. what represents the radial probability density of finding an electron

Q. What is the molecular orbital configuration of N2 molecule and N2-ion?

Q. select the correct statement about, the orbital overlap im N(SiH3)3 & P(SiH3)3 molecules.1. NSi axial and sideways 2. pSi only sidewYs

Q. The radii of maximum probability for 3s, 3p and 3d electrons are in the order:

1. $(r_{max}{)}_{3d}>(r_{max}{)}_{3p}>\left(r_{max}{)}_{3s}\right)$
2. $(r_{max}{)}_{3d}>(r_{max}{)}_{3s}>\left(r_{max}{)}_{3p}\right)$
3. $(r_{max}{)}_{3s}>(r_{max}{)}_{3p}>\left(r_{max}{)}_{3d}\right)$
4. None of these

Q. Which of the following option(s) is/are correct?

1. ${\Psi }^2$ gives the probability of finding an electron in an orbital
2. $5d_z^2$ has only 2 angular nodes
3. Probability of finding electron on y=x and y=-x is zero in
   $4d_{x^2-y^2}$ orbital
4. The radial part of the Schrodinger wave equation depends on the principal quantum number and the azimuthal quantum number but not on the magnetic quantum number

Q.

The value of $n_2+n_1$ and $n_2^2-n_1^2$ for $H{e}^{+}$ ion in atomic spectrum are 4 and 8 respectively. The wavelenght of emitted photon when electron jump from $n_2$ to $n_1$ is:

1. 

2. 

3. 

4. 

Q. 20.In NH3 why lone pair is presnt in Sp3 hybridised orbital

Q. 1. What is principal quantum number

Q.

In an atom, an electron is moving with a speed of $600m/s$ with an accuracy of 0.005 %. Certainity with which the position of the electron can be located is

($h=6.6\times {10}^{-34}kg{m}^2{s}^{-1}$, mass of electron, $e^m=9.1\times {10}^{-31}kg$)

1. 

2. 

3. 

4. 

Q. Number of degenerated orbitals in second shell of He+ ion

Q.

Graph of Radial Probability density v/s distance r of the electron from nucleus of 2s can be

1. 

2. 

3. 

4. 

Q. the energy required to exite an electron from ground state to 2nd excited state of H atom will be

Q. Find the quantum number ${}^{\prime }{n}^{\prime }$ corresponding to the state of $H{e}^{+}$ ion, if on transition to the ground state that ion emits two photons in succession with wavelength $108.5$ and $30.4nm$ (take $R_H=1.09\times {10}^{5}c{m}^{-1}$)

Q. electronic configuration of anion in sodium hydride will be- ( a) 1S^2 (b) 1S^1 (c)1S^0 (d)1S^1 2S^1

Q. how can we determine the spin quantum no. of an atomic orbital?

Q. for 2p_y what is the value of magnetic quantum no and how we will get it

Q. The quantum number that is no way related to other quantum number is

Q.

Which Quantum no. indicates direction of orientation of orbitals in space ?

Q. Q. What are the conditions at which electric discharge through the gases can be observed in cathode ray discharge tube?

Q. The quantum numbers $+\frac{1}{2}$ and $-\frac{1}{2}$ for the electron spin represent

1. Rotation of the electron in clockwise and anticlockwise direction respectively
2. Rotation of the electron in anticlockwise and clockwise direction respectively
3. Magnetic moment of the electron pointing up and down respectively
4. Two quantum mechanical spin states which have no classical analogue