Physics question and answers for July 02, 2023
- Q 17 The frequency of first line of Balmer series in hydrogen atom is vo The frequency of corresponding line emitted by singly ionised helium atom is a 2v0 b 4...
- Q 4 All of these are correct 65 The wave number of electromagnetic radiation emitted during the transition of electron in between two levels of Li ion whose principal quantum numbers...
- Q Emission transitions in the Paschen series end at orbit n 3 and start from orbit n and can be represented as v 3 29 x 1015 Hz 1 32 1...
- Q on energy of Het is 19 6 x 10 18 J per atom 45 af Het then the energy of Be ion in the second stationary state is 19 610...
- Q 3 6 34 x 10 4 1 49 10 51 Pick out the correct order of magnetic moment among the following 1 Na Cr2 Co Fe 2 Na Co2 Fe...
- Q If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom the total energy of the revolving electron will...
- Q benzene 50 At 200 C hydrogen molecule have velocity torr in 2 4 x 105 cm s The de Broglie wavelength in this case is approximately a vapour 1 1...
- Q c 100 106 Of the following transitions in hydrogen atom the one which gives an absorption line of lowest frequency is b n 3 ton 8 a n 1 to...
- Q The emission spectra of atoms in the gaseous phase do not show a continuous spread of wavelength from red to violet rather they emit light only at specific wavelengths wit...
- Q CAREER INS 81 The correct set of four quantum numbers for the last elec 81 37 tron of Rubidium atom Z 37 is 1 5 2 5 3 5 4...
- Q 1987 8 7 0 A bulb emits light of wavelength nm The bulb is rated as 200 W and 14 of the energy is emitted as light How many photons...
- Q 1 The time period of revolution in the third orbit of Li ion is x second The time period of revolution in the second orbit of He ion should be...
- Q Which of the following expressions represents the spectrum of Balmer series If n is the principal quantum number of higher energy level in Hydrogen atom R n 1 n 1...
- Q id 10 1 h k 0 Important Formulas of Bohr s Theory and hydrogenic ions That is ions having one elecron for example Their Application in Numerical All the formulas...
- Q Zero Marks 0 In all other cases The uncertainty in the position of an electron is equal to its de Broglie wavelength Find minimum percentage error in measurement of its...
- Q 4 Total number of electrons 3 1 2 Ti 5 If Zef of F Z 9 is X and Zef of Li Z 3 is Y then find the 36...
- Q The de Broglie wavelength of electron of He ion is 3 329 If the photon emitted upon de excitation of this He ion is made to hit H atom in...
- Q 32 Write the period number group number and block of the 32 42 41414 High tea and and fac sad zien ari zi IUPAC Naming Atomic Structure Periodic Tab element...
- Q Select the correct statements A Over a boundary surface value of probability density lyf is constant for a orbital B Probability of finding an electron is 100 in an orbital...
- Q From the following observations predict the type of orbital Observation 1 x y plane acts as nodal plane Observation only Observation 3 R r v s r curve obtained for...
- Q The measurement of the electron position is associated with an uncertainty in momentum which is equal to 1 10 18 g cm s g cm s The uncertainty in electron...
- Q 4 0 0 Four diatomic species are listed below in different 58 HP T sequences Which of these presents the correct order of their increasing bond order ant 15 19...
- Q A photon of 300 nm is absorbed by a gas and 69 then re emits two photons One re emitted photon has wavelength 496 nm the wavelength of second re...
- Q 75 Energy levels A B C of a certain atom corresponds to 75 increasing values of energy i e EA E E If and A are the wavelengths of radiations...
- Q 3 1 x 100 cm s 4 1 x 105 cm 5 1 7 1 12 In carius method 0 05 gram organic compound gave 0 03 12 Rafafu 0...
- Q Question 16 Among the second period elements the actual ionization enthalpies are in the order Li B Be C o KI F Ne Explain why i Be has higher A...
- Q Aqueous solution of two compound M O H M O H are prepared in two different beakers If EN of M 3 4 M 1 2 0 3 5 H...
- Q Which of the following options does not represent ground state electronic configuration of an atom a 1s 2s 2p 3s 3p6 3d8 4s 3s 3p6 3d 4s b 1s 2s...
- Q 2 I II e III rect 4 None of these 4 T The distance between third and 2nd Bohr s orbit of hydrogen 64 Si fa face au dau ar...
- Q 2 1 25h 1 X 4 TL 58 If ionisation energy for He ion is x Kcal mol then find out 58 Het x Kcal molt the energy of electron...
- Q Number of spectral line obtained when electron is provided with a photon of energy of 11 eV for H atom 01 02 00 06
- Q 108 cm 4 1 058 x 108 cm 65 The ratio of radius 2nd 4th and 6th orbits of hydrogen 65 A 2nd 4th en 6th 3 0 529 9...
- Q INSTITUTE 79 Angular momentum of electron for hydrogen in second orbit 79 El 24 at se en la tiam ante durant is x then it will be for Li 2...
- Q 81 SCQ If the ionic potential of ions is in the order M M Mand b polarizability of ions is in the order x y z Select the combination of...
- Q The effective nuclear charge experienced by a valence electron in an atom will be less than the actual charge on the nucleus because of the shielding or screening of valence...
- Q 2 4 4 1 3 29 Calculate the energy of a photon of sodium light of wave 69 44 folucnt 1368 length 5 862 x 10 6 m in Joules...
- Q 46 The quantum numbers of four electrons are as follows 1 Electron 1 ii Electron 2 1 Electron 3 n 3 3 4 1 0 0 m 2 1 0...
- Q the degenerate orbitals When several electrons occupy a set of degenerate orbitals the lowest energy state corresponds to the maximum possible extent of single occupation of orbital and parallel spins...
- Q 4 All 4 47 When an electron moving with a speed of 600 ms 1 with 47 600 ms n qu gu us d gia xfafradal an uncertanity of 0...
- Q Heat treatment of muscular pain involves radiation of wavelength of about 900 nm Which spectral line of H atom is suitable for this purpose R 1 x 105 cm h...
- Q Which one of the following statements related to lanthanons is incorrect 1 Europium shows 2 oxidation state 2 The basicity decreases as the ionic radius decreases from pr to Lu...
- Q The de Broglie wavelength 2 associated with a photoelectron varies with the frequency v of the incident radiation as vo is threshold frequency JEE Main 2019 1 v vo 1...
- Q 3 Four species are listed below i HCO3 iii HSO4 ii H30 iv HSO3F Which one of the following is the correct sequence of the acid strength 1 iv ii...
- Q The graph between y2 and r radial distance is shown below This represents JEE Main 2019 lyf 1 1s orbital 3 2p orbital 2 2s orbital 4 3s orbital
- Q What contribution did John Dalton make to atomic theory A B C D he discovered that every atom was positively charged he discovered that every every element consisted of one...
- Q An element with mass number 95 have 4 unit positive charge and 25 more neutrons than electrons in the given ionic state Its atomic number is Z then find the...
- Q For particles having same kinetic energy the de broglie wavelength Directly proportional to mass Inversely proportional to speed Inversely proportional to square root of mass Inversely proportional to square root...
- Q 0 The energy of an electron in the first Bohr obit of H atom 50 13 6 e Chemical Arithmetic Atomic Structure is 13 6 eV Then which of the...
- Q c excited state of Mg 9 Ionisation potential of hydrogen atom is 13 6 eV Hydrogen atom in the ground state are excited by monochromatic light of energy 12 1...
- Q 4 Can t be determined 4 Hond 6 8 eV 56 If the P E of an electron is 6 8 eV in hydrogen atom then 56 ISSIGA TRHY UN...
- Q 55 The maximum and minimum number of electrons in Co having 2 s 1 1 2 1 7 0 2 2 5 5 2 Can t be determined e P...
- Q 3 K E 3 4 eV 3 3 4 eV n 4 4 None of these 4 T 57 A 2 kW radio transmitter operates at a frequency of 400...
- Q 85 Which of the following is in order of increasing covalent 85 character 1 CCl4 BeCl BCl3 LICI 2 LICI CCI4 BeCl BCla 3 LICI BeCl BCl3 CCl4 4 LICI...
- Q How many a 58 grams NaCl contain more Cl atoms than 0 4 mol Cl b The energy lost by an electron that moves from the sixth to the second...
- Q 4 28 23 J K After hp 1 n 1 s 2 n 2 p n 1 d n 2 s R 8 35 m k 3 20 J K...
- Q 160 4 None of these 74 Value of screening constant for 39th electron of 39Y 1 39 2 36 3 18 4 20 4 74 Y 39 39 1 39...
- Q Which of the following electronic configuration represents a sudden large gap between the values of second and third ionisation energies of an element 1 1s 2s 2p 2 1s 2s...
- Q 9 From elementary molecular orbital theory we can deduce the electronic configuration of the singly positive nitrogen molecular ion N as 2 A 015 015202 202s 22p 02p B 01s201520252025...
- Q If the P E of an electron is 6 8 eV in hydrogen atom then what is the K E total energy and the orbit where electron exist are respectively...
- Q size 1 3 Decrease B CI Ipcrease Decrease B CI B CI Decrease Increase Decrease Decrease Decrease Decrease C S C S C S Decrease Increase Decrease Decrease Decrease Decrease...
- Q 31 Suppose the elements X and Y combine to form two compounds XY and X3Y When 0 1 mole of XY weights 2 10 g and 0 05 mole of...
- Q The pH of mixture obtained by mixing Vml each of 0 1M salicylic acid and 0 1M NaOH is x The Ka 1 and Ka of salicylic acid are 10...
- Q b a ground state of Na e excited state of Mg d excited state of Al 9 Ionisation potential of hydrogen atom is 13 6 eV Hydrogen atom in the...
- Q T Y B Sc I Physical Chemistry 8 The half life period of a radioactive element is 120 days After 600 days one gram of the element will reduce to...
- Q 5 In Bohr series of lines of hydrogen spectrum the third line from the red end corresponds to which one of the following inter orbit jumps of the electron for...
- Q 97 For which of the following the radius will be same as for hydrogen atom having n 1 a He n 2 ran Be n 2 b Li2 n 2...
- Q 3 K 4 Rb 88 Consider the following transformation X n X 9 X X2 9 9 Then correct relation between n and n is 1 n n 2 n...
- Q The approximate quantum number of a circular orbi diameter 20 6 nm of the hydrogen atom according Bohr s theory is Mxm a 10 c 12 www 14 d 16
- Q The energy needed to remove one electron from unipositive ion is abbreviated as A 1st I P B 3rd I P D 1st E A 2nd 1 P The radius...
- Q 4 15 The sub shell that comes after f sub sell is called g subshell The number of g sub orbitals in g sub shell and the total number of...
- Q A stream of electrons from heated filament was passed between two charged plates kept at a potential difference V esu If e and m are charge and mass of an...
- Q 5 a The wavelength in a vacuum of electromagnetic radiation is 275 nm What is the frequency of this radiation b What is the energy in joules of a photon...
- Q In a hydrogen spectrum if electron moves from 6th to 2nd orbit by transition in multi steps then find out the number of lines in spectrum Total number of line...
- Q A radioactive isotope having a half life of 3 days was received after 12 days It was found that there were 3 gm of the isotope in the container The...
- Q 1 For a hypothetical hydrogen like atom the potential energy of the system is given by U r where r is the distance between the two particles If Bohr s...
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