From the given sets of quantum numbers, the one that is inconsistent with the theory is

• n =3; l =2; m = -3; s = +$\frac{1}{2}$

• n = 4; l = 3; m = 3; s = +$\frac{1}{2}$

• n = 2; l = 1; m = 0; s = -$\frac{1}{2}$

• n = 4; l = 3; m = 2; s = +$\frac{1}{2}$

In the following particle

₃Li⁶ + ? → ₂He⁴ + ₁H³

the missing particle is

• electron

• neutron

• proton

• deuteron

153.

Bohr's radius of 2^nd orbit of Be³⁺ is equal to that of

• 4^th orbit of hydrogen

• 2^nd orbit of He⁺

• 3^rd orbit of Li²⁺

• first orbit of hydrogen

The sky looks blue due to

• dispersion effect

• reflection

• transmission

• scattering

A radioactive substance disintegrate its 90% in 100 days. How much time it will take to disintegrate its 99.9% ?

• 100 days

• 200 days

• 300 days

• 400 days

The wavelength of an electron having kinetic energy equal to 4.55 × 10^-25 J is (h = 6.6 × 10^-34 kgm²s^-1, mass of electron = 9.1 × 10^-31 kg)

• 7.25 × 10^-7 nm

• 725 nm

• 7.25 × 10^-7 m

• 7.25 × 10⁷ nm

A proton is converted to a neutron by

1.β^- emission

2.β⁺ emission

3. electron capture

Which of the statements given above are correct?

• (1) and (2) only 

• (2) and (3) only

• (1) and (3) only

• (1), (2) and (3)

In Neptunium series

${}_{94}{}^{241}\mathrm{Pu}\to \mathrm{Am}\to \mathrm{Np}\to \mathrm{Pa}\to {}_{92}{}^{238}\mathrm{U},$ the order of radiation

• β,α,α,β

• β,β,α,α

• α,α,β,β

• α,β,α,β

What number of subshells are possible in n = 3 energy level?

• 7

• 8

• 9

• 6

Four different sets of quantum numbers for 4 electrons are given below:

e₁ = 4, 0, 0, -$\frac{1}{2}$

e₂ = 3, 1, 1, -$\frac{1}{2}$

e₃ = 3, 2, 2, +$\frac{1}{2}$

e₄ = 3, 0, 0, +$\frac{1}{2}$

The order of energy of e₁, e₂, e₃, e₄ is 

• e₁ > e₂ > e₃ > e₄

• e₄ > e₃ > e₂ > e₁

• e₃ > e₁ > e₂ > e₄

• e₂ > e₃ > e₄ > e₁