Atomic Structure PYQs Set 4 (PDF)

Set 4 of 12 · Questions 91-120 of 359

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Mere Teacher · Previous Year Questions NEET Chemistry · Atomic Structure · Set 4 (Q91-120)
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91. $The spectrum of helium is expected to be similar to that of$ (1) $Li^{+}$ (2) $H$ (3) $Na$ (4) $He^{+}$ 92. $Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable for this purpose ? (R_{H} = 1 \times 10^{5} c m^{- 1} . h = 6.6 \times 10^{- 34} Js, c = 3 \times 10^{8} m s^{- 1})$ (1) $Paschen, \infty \to 3$ (2) $Paschen, 5 \to 3$ (3) $Balmer, \infty \to 2$ (4) $Lyman, \infty \to 1$ 93. $The ground state energy of hydrogen atom is -13.6 eV. The energy of second excited state of H e^{+} ion eV is:$ (1) $-27.2$ (2) $-54.4$ (3) $-3.4$ (4) $-6.04$ 94. $If, the binding energy of electrons in a metal is 250 kJ / mol, what should be the threshold frequency of the striking photons in order to free an electron from the metal surface?$ (1) $6.26 \times 10^{14} s^{- 1}$ (2) $12.4 \times 10^{14} s^{- 1}$ (3) $6.26 \times 10^{12} s^{- 1}$ (4) $12.4 \times 10^{12} s^{- 1}$ 95. $The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency ' A^{’} \times 10^{12} hertz and that has a radiant intensity in that direction of \frac{1}{B ^{’}} watt per steradian. 'A' and 'B' are respectively$ (1) $540 and 683$ (2) $450 and 683$ (3) $450 and \frac{1}{683}$ (4) $540 and \frac{1}{683}$ 96. $The maximum number of orbitals present in n = 4 energy level of an atom and the maximum number of electrons with spin value + \frac{1}{2} in the same orbitals are______ respectively.$ (1) $16,5$ (2) $16,7$ (3) $16,9$ (4) $16,16$ 97. $Which one of the following sets of quantum numbers represents the highest energy level in an atom?$ (1) $n = 4, l = 0, m = 0, s = + \frac{1}{2}$ (2) $n = 3, l = 1, m = 1, s = + \frac{1}{2}$ (3) $n = 3, l = 2, m = - 2, s = + \frac{1}{2}$ (4) $n = 3, l = 0, m = 0, s = + \frac{1}{2}$ 98. $If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength λ, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be : (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function):$ (1) $\frac{3}{4} λ$ (2) $\frac{1}{2} λ$ (3) $\frac{2}{3} λ$ (4) $\frac{4}{9} λ$ 99. $Choose the correct option regarding: Assertion: Energy of the orbital decreases with increase of ' n'. Reason: Energy is required in shifting away the negatively charged electron from positively charged nucleus.$ (1) $Assertion and Reason are correct statements and Reason is the correct explanation for Assertion$ (2) $Assertion and Reason are correct statements and Reason is not the explanation for Assertion$ (3) $Assertion is correct, Reason is wrong$ (4) $Assertion is wrong, Reason is correct$ 100. $Calculate the frequency if wavelength is 750 nm .$ (1) $2 \times 10^{14} Hz$ (2) $4 \times 10^{14} Hz$ (3) $6 \times 10^{15} Hz$ (4) $8 \times 10^{15} Hz$ 101. $Orbital having 3 angular nodes and 3 total nodes is$ (1) $5 p$ (2) $3 d$ (3) $4 f$ (4) $6 d$ 102. $The number of electrons with (n + l) values equal to 3 , 4 and 5 in an element with atomic number (z) 24 are respectively (n = principal quantum number and l = azimuthal quantum number)$ (1) $7, 8, 5$ (2) $6, 8, 6$ (3) $8, 7, 5$ (4) $8, 8, 5$ 103. $The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is:$ (1) $0.529 Å$ (2) $2π \times 0.529 Å$ (3) $\frac{0.529}{2 π} Å$ (4) $4 \times 0.529 Å$ 104. $The number of protons, neutrons and electrons in_{71}^{175} Lu, respectively are$ (1) $71, 104 and 71$ (2) $104, 71 and 71$ (3) $71, 71 and 104$ (4) $175, 104 and 71$ 105. $The pair, in which ions are isoelectronic with A 1^{3 +} is :-$ (1) $Br and B e^{2 +}$ (2) $C l^{-} and L i^{+}$ (3) $S^{2 -} and K^{+}$ (4) $O^{2 -} and M g^{2 +}$ 106. $The number of oribtals associated with quantum number n = 5, m_{s} = + \frac{1}{2}$ (1) $25$ (2) $30$ (3) $50$ (4) $35$ 107. $At temperatuere T, the average kinetic energy of any particle is \frac{3}{2} KT. The de Broglie wavelength follows the order:$ (1) $Visible photon > Thermal neutron > Thermal electron$ (2) $Thermal proton > Thermal electon > Visible photon$ (3) $Thermal proton > Visible photon > Thermal electron$ (4) $Visible photon > Thermal electron > Thermal neutron$ 108. $Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?$ (1) $The electron in a H atom's stationary state moves in a circle around the nucleus.$ (2) $An atom can take only certain distinct energies E_{1}, E_{2}, E_{3}, etc. These allowed states of constant energy are called the stationary states of atom.$ (3) $An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.$ (4) $When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.$ 109. $Vijayawada FM radio station broadcasts at frequency of 103.4 MHz. The wavelength of the corresponding radio waves (in m) is$ (1) $2.90$ (2) $29.0$ (3) $9.20$ (4) $92.0$ 110. $Given below are two statements: Statement-I: The orbitals having same energy are called as degenerate orbitals. Statement-II: In hydrogen atom, 3 p and 3 d orbitals are not degenerate orbitals. In the light of the above statements, choose the most appropriate answer from the options given$ (1) $Statement-I is true but Statement-II is false$ (2) $Both Statement-I and Statement-II are true.$ (3) $Both Statement-I and Statement-II are false$ (4) $Statement-I is false but Statement-II is true$ 111. $B e^{2 +} is isoelectronic with which ofthe following ions?$ (1) $H^{+}$ (2) $L i^{+}$ (3) $N a^{+}$ (4) $M g^{2 +}$ 112. $The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :$ (1) $0.529 Å$ (2) $2π \times 0.529 Å$ (3) $\frac{0.529}{2 π} Å$ (4) $4 \times 0.529 Å$ 113. $The correct set of four quantum numbers for outermost electron of potassium (Z = 19) is$ (1) $3, 1, 0, \frac{1}{2}$ (2) $4, 0, 0, \frac{1}{2}$ (3) $3, 0, 0, \frac{1}{2}$ (4) $4, 1, 0, \frac{1}{2}$ 114. $If two particles A and B are moving with the same velocity, but wavelength of A is found to be double than that of B . Which of the following statement is correct?$ (1) $Both A and B have same mass.$ (2) $Mass of A is half that of B .$ (3) $Mass of B is half that of A .$ (4) $Mass of B is one-fourth that of A .$ 115. $The number of angular nodes and radial nodes in 3s orbital are:$ (1) $1 and 0, respectively$ (2) $3 and 0, respectively$ (3) $0 and 1, respectively$ (4) $0 and 2, respectively$ 116. $If the de Broglie wavelength of the electron in n^{th} Bohr orbit in a hydrogenic atom is equal to 1.5 π a_{0} (a_{0} is Bohr radius), then the value of n/z is :$ (1) $0.40$ (2) $1.50$ (3) $1.0$ (4) $0.75$ 117. $The energies E_{1} and E_{2} of two radiations are 25 e V and 50 e V respectively. The relation between their wavelengths i.e., λ_{1} and λ_{2} will be$ (1) $λ_{1} = λ_{2}$ (2) $λ_{1} = 2 λ_{2}$ (3) $λ_{1} = 4 λ_{2}$ (4) $λ_{1} = \frac{1}{2} λ_{2}$ 118. $The total number of spectral lines observed when electron returns from the 6^{th} shell until the 2^{nd} shell in hydrogen atom is$ (1) $15$ (2) $10$ (3) $8$ (4) $2$ 119. $The radius of the second Bohr orbit, in terms of the Bohr radius, a_{0}, in L i^{2 +} is$ (1) $\frac{3 a _{0}}{4}$ (2) $\frac{4 a _{0}}{3}$ (3) $\frac{a _{0}}{3}$ (4) $\frac{16 a _{0}}{9}$ 120. $The orbital having two radial as well as two angular nodes is$ (1) $5d$ (2) $4f$ (3) $3p$ (4) $4d$