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51.	Which of the following may be an incorrect statement regarding cathode ray discharge tube?(a) Presence of negative charge in cathode rays(b) The magnetic field deflects these rays(c) It needs high voltage(d) Protons are present in cathode raysThe question was posed to me in unit test.My doubt stems from Discovery of Sub-atomic Particles topic in chapter Structure of Atom of Chemistry – Class 11
Answer» The correct answer is (d) Protons are PRESENT in CATHODE rays For explanation: Electric discharge in partially EVACUATED tubes in cathode RAY discharge tube. Cathodes rays are made up of electrons. There is a presence of negative charge in cathode rays, magnetic field deflects these rays. Cathode ray discharge tube needs HIGH voltage.

52.	Find out the wavenumber, when an electron jumps from 2^nd orbit to 1^st.(a) 82357.75 cm^-1(b) 105,677 cm^-1(c) 82257.75 cm^-1(d) 109,677 cm^-1This question was addressed to me in a job interview.This key question is from Developments Leading to the Bohr’s Model of Atom topic in section Structure of Atom of Chemistry – Class 11
Answer» Correct choice is (c) 82257.75 cm^-1 The best I can explain: The Swedish SPECTROSCOPIST, JOHANNES Rydberg gave a FORMULA; Wavenumber = RH[(1/n1)^2-(1/n2)^2]. Here RH is the Rydberg constant and is EQUAL to 109,677 cm^-1. Wavenumber = 109,677(3/4) = 82257.75 cm^-1.

53.	Iω = _________(a) mev^2r(b) mevr^2(c) mer(d) mevrI got this question in an interview for job.Enquiry is from Bohr’s Model for Hydrogen Atom topic in chapter Structure of Atom of Chemistry – Class 11
Answer» The CORRECT option is (d) mevr Easiest explanation: We know that linear MOMENTUM is given by mv and that angular momentun in Iω; m = MASS, V = VELOCITY, r = radius, I = inertia of momentum and w = angular velocity. I =mer^2 and ω = v/r and Iω = mer^2v/r = mevr.

54.	What is the wavenumber of violet color?(a) 25 x 10^3 mm^-1(b) 25 x 10^3 m^-1(c) 25 x 10^3 cm^-1(d) 25 x 10^3 nm^-1I got this question in unit test.My question comes from Developments Leading to the Bohr’s Model of Atom in division Structure of Atom of Chemistry – Class 11
Answer» CORRECT choice is (C) 25 X 10^3 cm^-1 The best I can explain: The wavenumber is the reciprocal or the inverse of wavelength. Wavenumber = 1/Wavelength. Its UNIT is cm^-1. The wavelength of violet color is 400nm as seen in the electromagnetic spectrum. So wavenumber = 1/400nm = 25 x 10^3 cm^-1.

55.	Who found out about dual behavior of a matter?(a) De Broglie(b) Bohr(c) Rutherford(d) ThomsonThe question was asked during an online interview.My question comes from Towards Quantum Mechanical Model of the Atom topic in chapter Structure of Atom of Chemistry – Class 11
Answer» Correct answer is (a) DE Broglie Explanation: A FRENCH PHYSICIST named LOUIS de Broglie proposed that matter exhibits both particle and wave like nature. This means that like photons, electrons ALSO should have both momentum and wavelength.

56.	No two electrons have the same set of all four quantum numbers.(a) True(b) FalseI had been asked this question during an internship interview.My question is from Quantum Mechanical Model of Atom topic in chapter Structure of Atom of Chemistry – Class 11
Answer» Right OPTION is (a) True Explanation: Yes, no TWO electrons have the same set of all four quantum numbers. This is explained by Pauli’s EXCLUSIVE principle. At most electrons can have all 3 quantum numbers the same as they are in the same orbital. But the spin quantum number’s VALUES are different.

57.	The energy of a hydrogen atom is positive.(a) True(b) FalseI had been asked this question in a national level competition.My question is based upon Bohr’s Model for Hydrogen Atom in division Structure of Atom of Chemistry – Class 11
Answer» The correct answer is (b) False Easy EXPLANATION: The energy of a HYDROGEN atom is negative. It MEANS the energy of a hydrogen atom is then that lower than that of a FREE ELECTRON that is at rest. This means the hydrogen atom has negative electronic energy.

58.	Which of the following models are not the same as Thomson Model of Atom?(a) plum pudding model(b) watermelon model(c) raisin pudding model(d) nuclear modelI have been asked this question in unit test.Enquiry is from Atomic Models in portion Structure of Atom of Chemistry – Class 11
Answer» Correct choice is (d) nuclear model To explain: Thomson proposed a model of the atom, in which ELECTRONS are embedded to make it as the stable electrostatic arrangement and such that positive charge is equally distributed around a sphere. Mass is assumed to be equally distributed. So. it has DIFFERENT names like PLUM pudding, WATERMELON and RAISIN pudding model.