The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x 10¹⁷ nms^-1.

Which value is closest to the wavelength in nanometer of a quantum of light with the

frequency of 6 x 10¹⁵ s^-1?

1. 10

2. 25

3. 50

4. 75

What is the maximum numbers of electrons that can be associated with the following set

of quantum numbers?

n=3, l = 1 and m=-1

1. 10

2. 6

3. 4

4. 2

From the given equation, certain conclusions are drawn.
\(\mathrm{E}=-2.178 \times 10^{-18} \mathrm{(J)} \frac{\mathrm{z}^2}{\mathrm{n}^2} \)$\mathrm{}$
Choose the incorrect statement:

The maximum number of electrons in a subshell with l = 3 and n = 4 is

1. 14

2. 16

3. 10

4. 12

The correct set of four quantum numbers for the valence electron of rubidium atom (Z =37) is

1. 5, 1, 1, +1/2               

2. 6, 0, 0, +1/2

3. 5, 0, 0, +1/2               

4. 5, 1, 0, +1/2

The total number of atomic orbitals in fourth energy level of an atom is

1. 16                                 

2. 32

3. 4                                   

4. 8

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ( λ₁ and λ₂ ) will be:

1. λ₁ = 2λ₂

2. λ₁ = 4λ₂ 

3. λ₁ = $\frac{1}{2}$λ₂

4. λ₁ = λ₂

If the principal quantum number n=6, the correct sequence of filling of electrons will be:

Which one of the following ions has electronic configuration [Ar]3d⁶?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

1. Ni³⁺               

2. Mn³⁺

3. Fe³⁺               

4. Co³⁺

Which one of the elements with the following outer orbital configurations may exhibit the

largest number of oxidation states ?

1. 3d³, 4s²

2. 3d⁵, 4s¹

3. 3d⁵, 4s²

4. 3d², 4s²