Structure of Atom

For hydrogen atom, the orbital/s with lowest energy is/are : Choose the correct answer from the options given below :

1. A only
2. B only
3. B, C and D only
4. A and E only

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this? Given : Rydberg constant RH = 105 cm-1, h = 6.6 10-34 J s, c = 3 108 m/s

1. Lyman series, 1
2. Balmer series, 2
3. Paschen series, 5 3
4. Paschen series, 3

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is false but Statement II is true
4. Statement I is true but Statement II is false

Given below are two statements about X-ray spectra of elements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are false

Radius of the first excited state of Helium ion is given as : a0 radius of first stationary state of hydrogen atom.

1. r = a04
2. r = 2a0
3. r = 4a0
4. r = a02

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are true

Niobium (Nb) and ruthenium (Ru) have “x” and “y” number of electrons in their respective 4 d orbitals. The value of x+y is .

Compare the energies of following sets of quantum numbers for multielectron system. (A) n = 4, l = 1 (B) n = 4, l = 2 (C) n = 3, l = 1 (D) n = 3, l = 2 (E) n = 4, l = 0 Choose the correct answer from the options given below :

1. (E) > (C) > (A) > (D) > (B)
2. (B) > (A) > (C) > (E) > (D)
3. (C) < (E) < (D) < (A) < (B)
4. (E) < (C) < (D) < (A) < (B)

Match List I with List II Choose the correct answer from the options given below:

1. A-IV, B-III, C-II, D-I
2. A-I, B-IV, C-III, D-II
3. A-III, B-II, C-I, D-IV
4. A-II, B-I, C-IV, D-III

Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter 10-15 m is 109 ms-1 (nearest integer) [Given : mass of electron = 9.1 10-31 kg, Planck's constant (h) = 6.626 10-34 Js] (Value of = 3.14)