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11th Chemistry Weekly Test - 1 ( Quantum Mechanical Model of Atom )

MABS Institution

11th Chemistry Weekly Test - 1 ( Quantum Mechanical Model of Atom )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Schrodinger wave equation is applied to determine______.

Probability of finding electron at a given point in space
Wave motion of the electron
Probability density of electron in a given region
All of the above

The total number of orbitals associated with the principal quantum number n = 3 is

9
8
5
7

As per Aufbau principle, arrange the orbitals in increasing order of energy

4p > 4d > 5s > 5p
4p < 4d < 5s < 5p
4d < 4p < 5s < 5p
4p < 5s < 4d < 5p

Who modified Bohr's theory by introducing elliptical orbits for electrons path?

Rutherford
Thomson
Hund
Sommerfeld

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be

-3E
\(\frac{-E}{3}\)
\(\frac{-E}{9}\)
-9E

The energies E₁and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie \(\lambda \)₁ and\(\lambda \)₂ will be

\(\frac { { \lambda }_{ 1 } }{ { \lambda }_{ 2 } } =1\)
\({ \lambda }_{ 1 }=2{ \lambda }_{ 2 }\)
\({ \lambda }_{ 1 }=\sqrt { 25\times 50{ \lambda }_{ 2 } } \)
\(2{ \lambda }_{ 1 }={ \lambda }_{ 2 }\)

Maximum number of electrons in a subshell of an atom is determined by the following

2l+1
4l-2
2n²
4l+2

If uncertainty in position and momentum are equal, then minimum uncertainty in velocity is

\(\frac { 1 }{ m } \sqrt { \frac { h }{ \pi } } \)
\( \sqrt { \frac { h }{ \pi } } \)
\(\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } } \)
\( { \frac { h }{4\pi } } \)

In Rutherford's gold foil experiment, a thin gold foil was bombarded with a stream of fast moving

B particles
\(\alpha\)-particles
\(\gamma\) particles
\(\delta\) particles

How many nodes are possible for 2s orbital?

1
2
3
zero

Part - B

Generic 2 - Answer All Question

How fast must a 54g tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light 5400\(\overset { 0 }{ A } \) ?

What is the charge and mass of an electron?

After the execution of the \(\alpha\)-ray scattering experiment, what were the observations made by Rutherford? What did he conclude from his observations?
For each of the following, give the sub level designation, the allowable m values and the number of orbitals
(i) n = 4, l=2, (ii) n = 5, l=3 (iii) n = 7, l=0

How many radial nodes for 2s, 4p, 5d and 4f orbitals exhibit? How many angular nodes

Part - C

Generic 3 - Answer All Question

Which quantum accounts for the orientation of the electron orbital?

In a chemical reaction, chlorine atom undergoes reduction and aluminium atom undergoes oxidation. Will this redox reaction affect their initial number of protons, neutrons and electrons?

State Heisenberg's uncertainty principle and give its mathematical expression
Two particles A and B are in motion. If the wavelength associated with the particle A is 5 \(\times\) 10^-8 cm calculate the wavelength of particle B, if its momentum is half of A.

Which of the following orbitals are possible? 1p, 2s, 2p and 3f.

Part - D

Generic 5 - Answer All Question

How does the effective nuclear charge influence the stability of the orbital?

What is the de Broglie wavelength (in cm) of a 160g cricket ball travelling at 140 Km hr^-1.

Complete the table given below

S.No Symbol Mass No. Atomic No Proton Neutron Electrons

1. Zn²⁺ 64 30 - - -

2. Cl^- 35 - - 18 18

3. Ar - - 18 22 1

Show that if the measurement of the uncertainty in the location of the particle is equal to its de Broglie wavelength, the minimum uncertainty in its velocity is equal to its velocity /4\(\pi\)
Enlist the postulates of Bohr's atom model.

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