11th Standard Chemistry Quantum Mechanical Model of Atom English Medium Free Online Test One Mark Questions 2020 - 2021

1.

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

(a)

3d⁵ 4s²

(b)

3d⁶ 4s¹

(c)

3d⁷ 4s^o

(d)

3d⁶ 4s²

2.

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

3.

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

4.

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.\(\triangle v\)

5.

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

(a)

8

(b)

18

(c)

32

(d)

36

6.

The energy of an electron of hydrogen atom in 4^thmain shell in terms of kJ mol ^-1 is_______________

(a)

-1312.8 kJ mol^-1

(b)

-82.05kJ mol^-1

(c)

-328.2kJ mol^-1

(d)

-656.4kJ mol^-1

7.

The energy of an electron of hydrogen atom in 2^nd main shell is equal to_________

(a)

-13.6 eV atom^-1

(b)

-6.8 eV atom^-1

(c)

-0.34 eV atom^-1

(d)

-3.4 eV atom^-1

8.

Which of the following is the expected 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

9.

Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

(a)

(i) and (iii)

(b)

(i) and (ii)

(c)

(iii) only

(d)

(i) and (iii)

10.

The number of planar nodes in an orbital can be determined from the value of ___________

(a)

principal quantum number (n)

(b)

azimuthal quantum number (l)

(c)

both principal and magnetic quantum number (n, m)

(d)

magnetic quantum number (m)

11.

Which of the following expressions represents the electron probability function?

(a)

\(4\pi r dr{ \Psi }^{ 2 }\)

(b)

\(4\pi r^2 dr{ \Psi }\)

(c)

\(4\pi r^2 dr{ \Psi }^{ 2 }\)

(d)

\(4\pi r dr{ \Psi }\)

12.

\({ \Psi }^{ 2 }\) = 0 represents:

(a)

a node

(b)

an orbital

(c)

angular wave function

(d)

wave function

13.

What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3,l = 1,m₁= 0

(a)

1

(b)

2

(c)

3

(d)

4

14.

₆C¹⁴ and ₇N¹⁴ are _____________

(a)

isotones

(b)

isoelectronic

(c)

isobars

(d)

isotopes

15.

How many neutrons and protons respectively are present in the ₆C¹³ nuclei?

(a)

6, 13

(b)

6, 7

(c)

13,6

(d)

7,6

16.

Match the list I with List II and select the correct answer using the code given below the lists.

List I		List II
A	The energies of electrons are quantized	1	Thomson's atomic model
B	Atom is a positively charged sphere in which the electrons are embedded	2	Bohr atom model
C	Planetary model	3	De Broglie
D	Dual nature of the microscopic particles	4	Rutherford