Question

136. The radius of hydrogen atom is 0.53A0 . The radius of 3 Li2+ is of 1) 1.27 A0 2) 0.17 A0 3) 0.57 A0 4) 0.99 A0 137. The spectrum of He is expected to be similar to 1) H 2) Li+ 3) Na 4) He+ 138. Existence of positively charged nucleus was established by 1) Positive ray analysis 2)   ray scattering experiments 3) X - ray analysis 4) Discharge tube experiments 139. Which radiation has maximum wavelength 1) u.v 2) visible 3) I.R 4) x - ray 149. Ratio of radii of second and first Bohr orbits of H atom 1) 2 2) 4 3) 3 4) 5 151. Splitting of spectral lines under the influence of magnetic field is called 1) Zeeman effect 2) Stark effect 3) Photoelectric effect 4) None of these 152. The radius of which of the following orbit is same as that of the first Bohr’s orbit of hydrogen atom 1) He+ (n = 2) 2) Li2+(n = 2) 3) Li2+(n = 3) 4) Be3+(n = 2) 153. The positive charge of an atom is 1) Spread all over the atom 2) Distributed around the nucleus 3) Concentrated at the nucleus 4) All of these .155. Energy of Bohr’s second orbit 1) Greater than 1st orbit 2) Lessar than 3rd orbit 3) Greater than 3rd orbit 4) Both (1) and (2) 156. The wavelength of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be 1) 25 : 9 2) 5 : 3 3) 9 : 25 4) 3 : 5 157. The total number of atomic orbitals in fourth energy level of an atom is 1) 4 2) 8 3) 16 4) 32 158. What is the maximum no. of emission lines obtained when the excited electrons of a hydrogen atom in n = 5 drop to ground state 1) 10 2) 5 3) 12 4) 15 159. Block body is 1) Perfect emmiter 2) Perfect absorber 3) Both (1) and (2) 4) Neither (1) nor (2) 164. Dual nature of particles was proposed by 1) Heisenberg 2) Lowry 3) De-Broglie 4) Schrodinger 169. The possibility of finding an electron in an orbital was conceived by 1) Rutherford 2) Bohr 3) Heisenberg 4) Schrodinger 172. The number of electrons in 3rd orbit 1) 3 2) 9 3) 18 4) 32 174. When an electron goes farthest from nucleus its 1) Energy decreases 2) Velocity decrease 3) Velocity increase 4) Angular momentum decreases 175. The energy 1st line of lyman series 1) Greater energy than all lines in the spectrum 2) Same energy with 1st line of balmer series 3) Lesier energy with 2nd line of limen series 4) All 176. The correct order of different shells in hydrogen atom 1) K > L > M 2) M > L > K 3) L > K > M 4) K > M > L 177. P.E of electron 1) Double than total energy 2) Half of total energy 3) Equal to kinetic energy 4) None of the above 180. Minimum de- Broglie wavelength is associated with 1) Electron 2) Proton 3) CO2molecule 4) SO2molecule

Answer 1

Answer:

1) 2

2) 2

3) alpha scattering experiment

4) 4

5) 2

6) 1

sorry time up for me also exam is there now it will start at 2 45 really Very very sorry plz forgive I don't why today you also have same exam timing sorry