Atomic Structure Questions and Answers

1 The maximum number of atomic orbitals associated with a principal quantum number 5 is 1 9 2 12 3 16 4 25 2 For a d electron the orbital angular momentum is in a gi 2 I giv 3 n gi 4 sg orbital 7 The m 3 are 1 2

The quantum numbers of most energetic electron in Ne atom when it is in first excited state is 1 2 1 0 1 2 2 3 1 1 1 2 3 3 0 0 1 2 4 3 1 0 1 2 4

Consider the following statements Matter consists of indivisible atoms p All the atoms of a given elements have identical properties including identical mass Atoms of different elements differ in mass C d Compounds are formed when atoms of different elements combine in a fixed ratio Atoms can neither be created nor destroyed in a chemical reaction e The correct statements are A a b c are correct statements B c d e are correct statements C a c e are correct statements 11 oro correct statements

Four containers of 2L capacity contains dinitrogen as described below Which one contains maximum num of molecules under similar conditions 1 2 5 gm molecules of N 3 3 01 x 1024 N atoms 2 4 gm atom of nitrogen 4 84 gm of dinitrogen

2 If one wanted to determine the mass of a single Argon atom what information would need to be know to complete this calculation Also provide the flow or pathway units labels arrows only atom Ar Info required here do not give a calculation 3

Electron revolving in first orbit of hydrogen with uncertainty of 0 1 of its velocity then uncertainty n its position will be 1 2 66 10 2 cm 3 2 66 x 10 6 m 2 2 66 x 10 8 m 4 2 66 x 10 0 cm

Small electric strip heaters with a width of 6 mm are oriented in a horizontal position The strips are maintained at 500 C and exposed to room air at 20 C Assuming that the strips dissipate heat from both the top and the bottom surfaces estimate the strip length required to dissipate 2 kW of heat by free convection

16 According to Born Oppenheim approximation the total energy of molecule is equ le de F de

c 1 70eV d 4 The value of charge on the oil droplets experimentally observed were 1 6 10 19 and 4 10 19 coulomb The value of the electronic charge indicated by these results is a 1 6 10 19 16 b 2 4 10 19 c 4x10 19 d 0 8x10 19 The Bohr s energy equation for H atom reveals that the 8x2

The frequency of a wave of light is 12 10 4 s The wave number associated with this light radiation is Question Type Single Correct Type 1 2 3 4 5 x 10 7 m 4 x 10 8 cm 1 2x 10 7 m 1 4 x 104 cm 1

Total number of enthalpy s out of given nine of M g which is are not associated with conversion of MM LE I E I E L E LE I E EGE EGE EGE I E lonization energy EGE electron gain enthalpy

possible from that state is a 6 b 5 d 15 c 7 Imagine an atom made up of a stationary proton and a hypothetical particle of double the mass of electron but having the same charge as the electron Apply Bohr s atomic model and consider all possible transitions of this hypothetical particle directly to the first excited state The longest wavelength photon that will be emitted has wavelength given in terms of Rydberg constant R for the hydrogen atom equal to E 9 3 5R 36 b 5R c 18 5R d 4 R

Which of the following phenomena are not justified by wave nature of light a Line spectra of atoms with special reference to hydroge b Variation of heat capacity of solids as a function of temperature c Photoelectric effect d Black body radiation a and b only c and d only b c and d only a b c and d

The minimum uncertainty in de Broglie wavelength of an electron accelerated from rest by a potential difference of 6 0V if the uncertainty in measuring 1 the position is nm is TU a 6 25 c 0 625 b 6 0 d 0 3125

In a sample of hydrogen atoms all the atoms are in a particular excited state If the emission spectrum of this sample has only 4 spectral lines in the visible region then the total number of spectral lines in IR region possible from that state is a 6 b 5 c 7 d 15 of double the mass of electron

3 When an electron de excites from higher orbit in H atom two radiations are emitted out in Paschen and Lyman series The wavelength of radiation emitted out in Lyman series is a BR 9 b 3R 4 4 C 3R 9 d BR

R n 2 n 2 4n 4n d 1 mole of atom The energy emitted when electron of 1 09 atom of hydrogen undergoes transition giving the spectral lines of lowest energy in the visible region of its atomic spectra is a 301 22 kJ b 328 kJ c 984 kJ d 182 22 kJ ories of lines in the spectrum of atomic hydrogen lines at wavelength 656 46 486 27 434 17 410 29 m

The standard emf of the cell Pt s H g HBr aq AgBr s Ag s was measured over a range of temperatures and the data were fitted to the following polynomial E V 0 07131 4 99 10 T K 298 3 45 10 T K 298 Evaluate the standard reaction Gibbs energy enthalpy and entropy at 298 K

For which of the following reaction AH AU PCI5 g PCl3 g Cl g CO g H O g CO g H g CaCO3 s CaO s CO g N g 3H g 2NH3 g

The wavenumbers of the three normal modes of H O are 3656 7 cm 1594 8 cm and 3755 8 cm Evaluate the vibrational partition function at 1500 K

Common ion effect will observed in the aqueous solution of NaCl HCI NaCl CH3COOH CH3COONa NaOH CH3COOH HCI

One mole of gas occupying 3 litre volume is expanded against a constant external pressure of one atm to a volume of 15 litre The work done by the system is 1 1 215 x 10 J 2 12 15 x 10 3 J 3 121 5 x 10 J par nad lover 4 1 215 x 10 J

Wrong statement regarding methyl carbonium ion CH3 A B C It is sp2 hybridised Vacant orbital is sp hybridised Vacant orbital is perpendicular to molecular planar and in pure p orbital It is electrophile with sextet of electron

Electron arrangements H 25 19 Na Mg Be K 20 Ca BID IVE 21 Sc Ti 23 V xx xx C 24 VID xx Periodic Table of the Elements VI Number the Symbol Name 28 10 29 ces 7 12 10 20 13 13 HA A B Al 16 14 IVA 4A C Si 15 VA Z P 16 16 VIA OS T

Question No 33 Chem Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out of Select the interhalogen of square pyramidal shape among the given options O CIF3 O IF O BrFs a ICI

In 14N if mass attributed to electrons were double the mass attributed to protons were halved th atomic mass would become approximately 1 Halved 2 Doubled 3 Reduced by 25 4 Remain same ASOO

3 For the azimuthal quantum number the to number of magnetic quantum number is given 1 2 3 4 m 1 2 m 1 2 2m 1 2 2m 1 2

49 The primary and secondary valences of the central atom of a schematic representation of given complex are respectively 1 6 6 H O H O 9 C plap OH 8 OH CI OH CI OH

ays that pairing will not done until each orbital will have atleast one electron so 3 ption satisfy hunds rule plss explain un 4 2021 9 28 12 PM Answered 135 Which of the following is violating Hund s rule 1 1 11 2 1 16 14 3 1 1 4 All of the above

An electron in a hydrogen atom is in gr ound state It is excited to a state wher e its path length is five times its de Bro glie wavelength From there it transits b ack to ground state producing maximu m number of photons possible If the s econd highest energy photon emitted fr om this transition is used to excite a Li 2 ion in an excited state find the final excited state to which the Li2 electron jumps

5 Which of the following is true according to variational theorem I The ground state energy of a quantum mechanical system is zero II III w H w v v v H v Eo Eo IV The ground state energy of a quantum mechanical system is infinite A I and II B II only C III only D I and IV

13 An energy of 24 6 eV is required to remove o the electrons from a He atom The energy requir remove both the electrons from He atom is a 38 2 eV c 51 8 eV b 49 2 eV d 79 eV

Magnesium reacts with an element X to form an ionic compound If the ground state electronic configuration of X is 1s 2s 2p the simplest formula for this compound is 2018 a Mg X c Mg X b MgX d Mg X

Consider the lons given below along with their size w 100 pm P x 150 pm y 200 pm Identify the incorrect statement O The solid wR undergo Frenkel defect The solid yP undergo Frenkel defect O The solid xP undergo Schottky defect O The solid xQ undergo Schottky defect R 200 pm 300 pm 350 pm

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to 8 9 times the rydberg constant if the electron jumps from a n 3 to n 1 b n 10 to n 1 c n 9 to n 1 d n 2 ton 1

In given figures of FCC unit cell a plane is shown in which certain arrangement of atoms are find here find out number of planes in which given arrangement of atoms can be find iv Match the colum A B C 8 88 ge v Column l Arrangement of the atoms ions 1 2 3 iii Column II Planes in FCC lattice 2 5 4

der the following series of reactions Cl NaOH NaCl NaClO H O NaClO NaCl NaClO NaCIO NaClO NaCl How many moles of NaCIO are obtained after the completion of reactions by taking 1 m Cl NaOH in excess A mol B Zero c mo C D None of these

The figure that is not a direct manifestation of the quantum nature of atoms is Rb 1 1 Internal 1 energy of Ar 3 1 300 400 500 600 Increasing wavelength 2 Kinetic energy of photoelectrons Intensity of 4 black body radiation K Na Frequency of incident T T T

87 Consider the following reactions i NaNO HCI 0 5 C ii B naphthol NaOH 88 P The compound P is NH 2 Bry H O CH Colored Solid C H6NBr3 NH NH NHCH 2 CH 3 CH CH The function of Sodium pump is a biological process operating in each and every cell of al

Two parallel planes 90 by 60m are separated by a distance of 60 cm One plane is maintained at a temperature of 800 K and has an emissivity of 0 6 The other plane is insulated The planes are placed in a large room that is maintained at 290 K Calculate the temperature of the insulated plane and the energy lost by the heated plane

11 If the wave number of 1st line of Balmer series of H atom is x then 108 x A Wave number of 1st line of lyman series of the He ion will be 5 36x B Wave number of 1st line of lyman series of the He ion will be 5 5 C The wave length of 2nd line of lyman series of H atom is 32x 32x D The wave length of 2nd line of lyman series of H atom is

electron position is en momentum which the uncertainty in electron 9x10 28g 1x 109 cm s 1 According to the Bohr Theory which of the following transitions in the hydrogen atom will give rise to the least energetic photon 1 n 5 to n 3 3 n 5 to n 4 IS 2 n 6 to n 1 4 n 6 to n 5 Yn 2011

BEGINNER S BOX 6 A neutral atom of an element has 2K 8L 11 M and 2N electrons The number of p electrons in the atom are 1 2 212 3 10 4 6 An atom has 2 electrons in K shell 8 electrons in L shell 8 electrons in M shell The numbe

45 Total no of voids in 0 5 mole of a compound formin closed packed structure are hexagonal a 6 022 1023 b c 9 033 x 1023 d 3 011 x 1023 4 516 1023

In which one of the following the number of protons is greater than neutrons but number of protons is less than the number of electrons Kerala PMT 2008 b SO 2 c H O d s o 0 OH 3

10 Two electrolytic cells containing AgNO3 abd CuSO4 solution connected in series A steady current of 2 5A was passed till 1 078g of Ag is deposited How long did the current flow What mass of copper will be deposited atomic mass of Ag 107 8 Cu 63 5

The compound of the highest acidity is OH b c 2 2 Dimethylbutane OH HO 2 3 Dimethyl 2 butene undergoes catalytic hydrogenation to give a 2 3 Dimethylbutane b 2 Methylpentane OH d 3 Methylpentane OCH3 d 11 OH 12

A hypothetical element Z exists in nature as two isotopes Z65 and Z67 with their relative abundances 25 75 respectively Then the average atomic mass in u of element Z is A 65 5 B 66 C 66 25 D 66 5

If A is the wavelength of the line for jump of the electron from 7th to 6th orbit and A that of the line for jump from 6th to 5th orbit then the wave number of the line for the jump from 7th orbit to 5th orbit will be

1 dien 2 tri n 3 en 4 dmg Arrange the following compounds in order of increasing dipole moment Increasing dipole moment I Toluene II III o dichlorobenzene m dichlorobenzene IV p dichlorobenzene 3 IV I III II 1 I IV II III 2 IV I II III 4 IV II I III Which of the following electrolutoe will be most effective in the coagulation of gold co