P. JOY MINOR TEST (ATOMIC STRUCTURE) TIME : 1½ Hrs. IIT-JEE CHEMISTRY SINGLE OPTION CORRECT (+3, 1) M.M. 130

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1 MINOR TEST (ATOMI STRUTURE) (PHYSIAL) HEMISTRY TIME : 1½ Hrs. SINGLE OPTION ORRET (+3, 1) M.M. 130 Q.1 When the azimuthal quantum number has the value of 2, the number of orbitals possible are : (A) 0 () 4 () 1 () 5 Q.8 Which of the following represents the correct set up of the four quantum number of 4s electron : (A) 4, 1, 0, +½ () 4, 1, 1, ½ () 4, 2, 1, +½ () 4, 0, 0, ½ Q.2 For a d-electron, the orbital angular momentum is : (A) () l (6 l) () (2 l) () 2l Q.9 The orbital diagram in which the Aufbau principle is violated is : (A) () Q.3 The ratio of kinetic energy and potential energy of an electron in a ohr orbit of a hydrogen like species is : (A) 1 () +1 () ½ () +½ Q.4 In which of the following sets do all species have the same number of electrons? (A) O, O 2, O 2+ () Mg 2+, Sr 2+, r 2+ () r, Kr, Sr 2+ (), N 3, O 2 Q.5 Of the following, which has the shortest de roglie wavelength? (A) A nitrogen molecule moving at a velocity of 4000 mph. () A nitrogen molecule moving at a velocity of 1100 mph. () A helium nucleus moving at a velocity of 1200 mph () An airplane moving at a velocity of 200 mph. Q.6 Rutherford's a-particles scattering experiment led to the conclusion that : (A) Atoms are electrically neutral () Mass and energy are related () Mass and positive charge of an atom are concentrated in the nucleus. () Neutrons are present in the nucleus. Q.7 The mass of an electron is m. Its charge is e and it is accelerated from rest through a potential difference V. The velocity acquired by the electron will be : (A) V/m () ev/m () 2eV/m () None of these () () Q.10 Which of the following orbitals can have more than one nodal plane? (A) 1s () () () 3d Q.11 Which of the following represent electron configuration that violate the Pauli exclusion principle? (I) [Ne] 3s 1 3p 5 (II) [Kr] 4d 12 5s 2 5p 3 (III) [Ar] 3d 10 4s 2 2 (A) Only II () oth I and III () Only I () oth II and III Q.12 The number of d-electrons in Ni (atomic number = 28) is equal to that of the : (A) d-electrons in Ni 2+ () Total electrons in N (atomic number = 7) () s and p electrons in F () p-electrons in Ar (atomic number = 18) Q.13 If n = 3, l = 0, m = 0, then atomic number is : (A) 12, 14 () 11, 13 () 11, 12 () 13, 14 Q.14 The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and alpha particle (a) is : (A) n, p, a, e () n, a, p, e () n, p, e, a () e, p, n, a 1

2 MINOR TEST (ATOMI STRUTURE) (PHYSIAL) HEMISTRY Q.15 Name the ions indicated by the following electronic configurations : d 3d (A) Ni 2+, r () Zn 2+, Rb 2+ () u 2+, Se 2 () o 3+, Rb + Q.16 Which of the following ions has the maximum magnetic moment? (A) Mn 2+ () Fe 2+ () Ti 2+ () r 2+ Q.22 The masses of photons corresponding to the first lines of the Lyman and the almer series of the atomic spectrum of hydrogen are in the ratio of : (A) 4 : 9 () 27 : 5 () 9 : 4 () 1 : 1 Q.23 The electrons, identified by quantum numbers n and l (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 (iv) n = 3, l = 1 can be placed in order of increasing energy from the lowest to highest as : (A) iv < ii < iii < i () i < iii < ii < iv () ii < iv < i < iii () iii < i < iv < ii Q.17 In which of the following case would the probability of finding an electron residing in a dxy orbital be zero? (A) xz and yz-planes () xy and yz-planes () z-direction, yz and xz-planes () xy and xz-planes Q.18 The first emission lines in the atomic spectrum of hydrogen in the almer series appears at : (A) 3R 4 cm 1 () 36 5R cm 1 () 5R 36 cm 1 () 7R 36 cm 1 Q.19 A photon of wavelength 300 nm is absorbed by a gas and then re-emitted as two photon. One photon is red with wavelength of 760 nm. The wave number of the second photon will be : (A) m 1 () m 1 () m 1 () m 1 Q.20 If uncertainty in position and momentum are equal then uncertainty in velocity is : (A) () 1/m (h/ π) () (h/ π) 1/2m (h/ π) () (h/2) π Q.21 The numerical value y 4, 2, 0 denotes : (A) 4dx 2 y 2 () 4dz 2 () 4p z () 4f xyz Q.24 The radius of which of the following orbits is same as that of the first ohr's orbit of hydrogen atom? (A) He + (n = 2) () Li 2+ (n = 2) () Li 2+ (n = 3) () e 3+ (n = 2) Q.25 Radial nodes present in 3s and orbitals are respectively : (A) 0, 2 () 2, 0 () 2, 1 () 1, 2 MULTIPLE HOIE ORRET (Q.26 TO 28): Q.26 Which of the following statement is/are correct? (A) In silver atom, 23 electrons have a spin of one type and 24 of the opposite (atomic number of Ag = 47) () The number of unpaired electrons in both Fe 2+ and Mn 2+ are five () The electronic configuration of r is [Ar] 3d 4 4s 1 (atomic number of r = 24) () The azimuthal quantum number may have a negative value. Q.27 The ratio of the de-roglie wavelengths of an a-particle and a proton can be 2 : 1 when : (A) Their velocities are in 4 : 1 ratio () Their velocities are in 8 : 1 ratio () Their kinetic energies are in 128 : 1 ratio () Their kinetic energies are in 256 : 1 ratio. Q.28 The angular momentum of any electron can have the value(s) : (A) 3(h/π) () 0.5 (h/π) () 2.5 (h/2π) () (h/π) 2

3 MINOR TEST (ATOMI STRUTURE) (PHYSIAL) HEMISTRY omprehension (Q.29 to 31) : Elements are composed of tiny particles known as atoms. Atoms are made of fundamental particles (e, p, n). According to Rutherford's Atomic Model p, n are located in Nucleus. ohar's model explained the existence of circular orbits (energy levels) around the nucleus. ohr's model can explain the spectrum of hydrogenic species and helps in find e, v, r (energy, velocity and radius) in nth orbit. Q.29 The ratio of r 4 and r 3 for hydrogen atom and that of Li +2 ion : (A) 1 : 3 () 3 : 1 () 1 : 9 () 1 : 1 Q.30 The value of electro static potential energy = (A) mv 2 () qq πε r () () 2 ze r 2 1 ze 4πε r Q.31 In an orbit the velocity of an electron in excited state of H-atom is cm/s. What is the circumference in this orbit : (A) 6.65 Å () 3.33 Å () 13.3 Å () Å Q.32 Assertion : The shortest wavelength of transition of Lyman series is observed when electron jumps from orbit number, n = to n = 1. Reason : Since the wavelength of transition is given by hc/λ = E. (A) If Assertion and Reason both are correct and Reason is the correct explanation of Assertion. () If Assertion and Reason both are correct but Reason is not the correct explanation of Assertion. () Assertion is true but Reason is false () Assertion is false but Reason is true. Q.33 Assertion : The kinetic energy of photoelectrons increases with increase in frequency of incident light. Reason : The number of photoelectron ejected increases with increase in intensity of light. (A) If Assertion and Reason both are correct and Reason is the correct explanation of Assertion. () If Assertion and Reason both are correct but Reason is not the correct explanation of Assertion. () Assertion is true but Reason is false () Assertion is false but Reason is true. Q.34 Match the following : olumn I (A) r () u () K () Fe olumn II (p) 4s 1 state configuration state (q) Unpaired in 4s-orbit. (r) Un-paired electron in 3d-orbital (s) Ferro magnetic. Q.35 Match list I with list II and select the correct answer using the codes given below the lists : olumn I (Metal ions) olumn II (A) r 3+ (p) 35 () Fe 3+ (q) 8 () Ni 2+ (r) 24 () Mn 2+ (s) 15 (Magnetic moment) 3

4 MINOR TEST (ATOMI STRUTURE) (PHYSIAL) HEMISTRY SPAE FOR ROUGH WORK 4

5 Name :... Roll No. : A A Name :... Roll No. : A A

I. Multiple Choice Questions (Type-I)

I. Multiple Choice Questions (Type-I) 1. Which of the following conclusions could not be derived from Rutherford s α -particle scattering experiement? (i) Most of the space in the atom is empty. (ii) The