Two electrons occupying the same orbital are distinguished by ___________

(a)

azimuthal quantum number

(b)

spin quantum number

(c)

magnetic quantum number

(d)

 orbital quantum number

The number of nodes in s orbital of any energy level is equal to _________

(a)

n

(b)

2n²

(c)

n-1

(d)

n-2

Which one of the following orbitals is spherical in shape?

(a)

4s

(b)

3p

(c)

3d

(d)

4f

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S^-1 will have a de Broglie wavelength of ___________

(a)

6.6 x 10^-29 cm

(b)

6.6 x 10^-30 cm

(c)

 6.6 x 10^-31 cm

(d)

6.6 x 10^-32 cm

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

(a)

A	B	C	D
1	3	2	4

(b)

A	B	C	D
4	3	1	2

(c)

A	B	C	D
3	1	4	2

(d)

A	B	C	D
2	1	4	3

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

(a)

6, 13

(b)

6, 7

(c)

13,6

(d)

7,6

₆C¹⁴ and ₇N¹⁴ are _____________

(a)

isotones

(b)

isoelectronic

(c)

isobars

(d)

isotopes

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

\({ \Psi }^{ 2 }\) = 0 represents:

(a)

a node

(b)

an orbital

(c)

angular wave function

(d)

wave function

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)

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

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)

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)

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

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

The energy of an electron of hydrogen atom in 4^th main 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

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

(a)

8

(b)

18

(c)

32

(d)

36

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.\(\triangle v\)

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

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

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

(a)

3d⁵ 4s²

(b)

3d⁶ 4s¹

(c)

3d⁷ 4s^o

(d)

3d⁶ 4s²