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Chapter - 2 Quantum Mechanical Model of Atom English medium Public one mark questions - III | QB365

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Chapter - 2 Quantum Mechanical Model of Atom English medium Public one mark questions - III

Published on: 27/04/2019

Public one mark questions Quantum Mechanical Model of Atom - III

Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Questions:

Multiple Choice Question

22 x 1 = 22

Which of the following statements is correct for an electron that has the quantum numbers n = 4 and in = -2.

(a)

The electron may be in 2p orbital

(b)

The electron may be in 4d orbital

(c)

The electron is in the second main shell

(d)

The electron must have spin quantum number as \(+\frac{1}{2}\)

The maximum number of electrons in a sub-shell is given by the equation________.

(a)

n²

(b)

2n²

(c)

2l- 1

(d)

2l+1

The outermost electronic configuration of manganese (at. no. = 25) is___.

(a)

3d⁵ 4s²

(b)

3d⁶ 4s¹

(c)

3d⁷ 4s^o

(d)

3d⁶ 4s²

The orbital with n = 3 and l = 2 is____.

(a)

(b)

(c)

(d)

de Broglie equation is______.

(a)

\(\lambda=\frac{h}{mv}\)

(b)

\(\lambda=\frac{hv}{m}\)

(c)

\(\lambda=\frac{mv}{h}\)

(d)

\(\lambda=hmv\)

The idea of stationary orbits was first given by_________.

(a)

Rutherford

(b)

J.J. Thomson

(c)

Niels Bohr

(d)

Max Planck

In a sodium atom (atomic number = 11 and mass number = 23) and the number of neutrons is___________.

(a)

equal to the number of protons

(b)

less than the number of protons

(c)

greater than the number of protons

(d)

none of these

Which of the following is the actual configuration of Cr (Z = 24)?

(a)

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²

(b)

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹

(c)

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶

(d)

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s³

What are the values of n, I, m and s for 3p_x electron?

(a)

3,2,1,0

(b)

3,1,-1,+1/2

(c)

3,2,+1,-1/2

(d)

3,0,0,+1/2

10.

Which of the following provides the experimental justification of magnetic quantum number?

(a)

Zeeman effect

(b)

Stark effect

(c)

Uncertainty principle

(d)

Quantum condition

11.

What is the formula used to calculate the angular momentum?

(a)

\(\sqrt{l(l+1)}{h\over 2\pi}\)

(b)

\(mvr\over 2\pi\)

(c)

\(mvr\over 2\)

(d)

m.\(\triangle v\)

12.

Which one of the quantum number is used to calculate the angular momentum of an atom?

(a)

(b)

(c)

(d)

13.

When l = 0, the number of electrons that can be accommodated in the subshell is_______________

(a)

(b)

(c)

(d)

14.

The maximum number of electrons that can be accommodated in f orbital is _________

(a)

(b)

(c)

(d)

15.

The maximum number of electrons that can be accommodated in N shell is_____________

(a)

(b)

(c)

(d)

16.

Match the list-I and list-II correctly using the code given below the list.

List-I	List-II
A. Principal quantum number	1.represents the directional orientation of orbital
B. Azimuthal quantum number	2.represents the spin of the electron
C. Magnetic quantum number	3.represents the main shell
D. Spin quantum number	4.represents the sub shell

(a)

A	B	C	D
3	4	1	2

(b)

A	B	C	D
4	2	3	1

(c)

A	B	C	D
2	1	4	3

(d)

A	B	C	D
1	3	2	4

17.

Which one of the following is the time independent Schrodinger wave equation?

(a)

\(\triangle x.\triangle p\ge {h\over 4\pi}\)

(b)

\({\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}=0\)

(c)

\({\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}(E-V)\psi=0\)

(d)

\(\hat{H}\psi-E\psi=-{8\pi^2m\over h^2}\)

18.

The crystal used in Davison and Germer experiment is__________

(a)

nickel

(b)

zinc sulphide

(c)

gold foil

(d)

NaCI

19.

de Broglie equation is_________

(a)

E = \(h \ \gamma\)

(b)

E = mc²

(c)

\(\gamma ={E_2-E_1 \over h}\)

(d)

\(\lambda ={h\over mv}\)

20.

Who proposed the dual nature of light to all forms of matter?

(a)

John Dalton

(b)

Neils Bohr

(c)

Albert Einstein

(d)

J. J. Thomson

21.

The formula used to calculate the Bohr's radius is__________

(a)

\(r_n={(-13.6)Z^2\over n^2}eV \ atom^{-1}\)

(b)

\(r_n={(0.529)n^2\over z}A\)

(c)

\(r_n={(-1312.8)Z^2\over n^2}kJ \ mol^{-1}\)

(d)

\(r_n={(+1312.8)n^2\over Z^2}kJ \ mol^{-1}\)

22.

The Bohr's radius of Li²⁺ of 2^nd orbit is ________________

(a)

0.529 \(\mathring{A}\)

(b)

0.0753\(\mathring{A}\)

(c)

0.7053\(\mathring{A}\)

(d)

0.0529\(\mathring{A}\)

Assertion and reason

3 x 2 = 6

23.

Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known.
Codes:
(a) Both assertion and reason are true and reason is correct explanation for the assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation for the assertion
(c) Assertion is true and the reason is false
(d) Both assertion and the reason are false

(a)

Both assertion and reason are true and reason is correct explanation for the assertion.

(b)

Both assertion and reason are true but the reason is not the correct explanation for the assertion

(c)

Assertion is true and the reason is false

(d)

Both assertion and the reason are false

24.

Assertion (A): Copper (Z = 29) with electronic configuration [Ar] 4s¹ 3d¹⁰ is more stable than [Ar] 4s² 3d⁹.
Reason (R): Copper with [Ar] 4s¹ 3d¹⁰ is more stable due to symmetrical distribution and exchange energies of d electrons.
Codes:
(a) A and R are correct and R is the correct explanation of A.
(b) A and R are correct but R is not the correct explanation of A.
(c) A is correct but R is wrong.
(d) A is wrong but R is correct.

(a)

A and R are correct and R is the correct explanation of A.

(b)

A and R are correct but R is not the correct explanation of A.

(c)

A is correct but R is wrong.

(d)

A is wrong but R is correct.

25.

Assertion(A): Cr with electronic configuration [Ar] 3d⁵ 4s¹ is more stable than [Ar] 3d⁴ 4s².
Reason(R): Half filled orbitals have been found to have extra stability than partially filled orbitals.
Codes:
(a) A and R are correct and R is the correct explanation of A.
(b) A and R are correct but R is not the correct explanation of A.
(c) A is correct but R is wrong.
(d) A is wrong but R is correct.