Question

152. As an electron is brought from an infinite distance close to nucleus of atom, the energy of electron 1) Increase to a greater +ve value 2) Decrease to a smaller +ve value 3) Increases to a smaller -ve value 4) Decrease to a greater -ve value 153. The ratio of the radii of the first three orbits in an atom of hydrogen is 1) 1 : 4 : 9 2) 9 : 4 : 1 3) 1 : 2 : 3 4) 3 : 2 : 1 156. Which of the following transistions in hydrogen atom will require the highest amount of energy 1) n = 1 to n = 2 2) n = 1 to n = 3 3) n = 2 to n = 1 4) n = 3 to n = 4 160. In a series in the spectrum of hydrogen, the wavelength of radiation is 6,563A0. The name of the series and the orbits in which electron transition takes place are 1) Balmer series, 3rd to 2nd orbit 2) Lyman series, 2nd to 1st orbit 3) Pfund series, 6th to 5th orbit 4) Paschen series, 4th to 3rd orbit 163. Which of the following transitions will have minimum wavelength ? 1) n4  n1 2) n2  n1 3) n4  n2 4) n3  n1 165. The ratio of the wavelength of first line of Lyman series of Hydrogen atomic spectrum and the first line of Balmer series of He+ spectrum is 1) 20 : 27 2) 27 : 20 3) 1 : 4 4) 4 : 1 166. Nitride ion in Li3N is composed of 1) 7 protons + 7 electrons 2) 10 protons + 7 protons 3) 7 protons + 10 electrons 4) 10 protons + 10 electrons 172. Identify the correct statements in the following. A) Einstein explained photo electric effect by using planck’s quantum theory B) Black body radiation can be explained by wave nature of light C) Bunsen used line spectrum to identify elements D) When an iron rod is heated in a furnance, one of the radiations emitted by it is yellow 1) A, C 2) A, B, C, D 3) A, C, D 4) A, B, C 173. Which of the following cannot give band spectrum 1) Hydrogen 2) Oxygen 3) Helium 4) Nitrogen answer if u know.....

Answer 1

Answer:

152) 4

153) 1

156) 1

160) 1

163) 1

165)

166) 3

172

173) 2

Explanation:

I think so some questions options are given wrong so i left some questions paper konchem hard undi previous question ki vellu inka konni answers chesta so you can see there sorry for late

Answer 2

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