Atomic Structure PYQs Set 11 (PDF)

Set 11 of 12 · Questions 301-330 of 359

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Mere Teacher · Previous Year Questions NEET Chemistry · Atomic Structure · Set 11 (Q301-330)
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301. $Consider the hypothetical situation where the azimuthal quantum number, l, takes values 0, 1, 2, \dots, n + 1, where n is the principal quantum number. Then, the element with atomic number$ (1) $9 is the first alkali metal$ (2) $6 has a 2 p -valence subshell$ (3) $8 is the first noble gas$ (4) $13 has a half-filled valence subshell$ 302. $According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 \times 1 0^{- 27} ergs, c = 3 \times 1 0^{10} cm s^{- 1}, N_{A} = 6.02 \times 1 0^{23} mo l^{- 1})$ (1) $\frac{1.196 \times 1 0 ^{8}}{λ}$ (2) $\frac{2.859 \times 1 0 ^{5}}{λ}$ (3) $\frac{2.859 \times 1 0 ^{16}}{λ}$ (4) $\frac{1.196 \times 1 0 ^{16}}{λ}$ 303. $The velocity (v) of de Broglie wave is given by [ν = Frequency, m = mass, C = Velocity of light]$ (1) $m C^{2}$ (2) $ν λ$ (3) $\frac{h ν}{m C}$ (4) $\frac{C ^{2}}{ν}$ 304. $Given below are the quantum numbers for 4 electrons. A. n = 3, l = 2, m_{l} = 1, m_{s} = +1/2 B. n = 4, l = 1, m_{l} = 0, m_{s} = +1/2 C. n = 4, l = 2, m_{l} = -2, m_{s} = -1/2 D. n = 3, l = 1, m_{l} = -1, m_{s} = +1/2 The correct order of increasing energy is :$ (1) $D<B<A<C$ (2) $D<A<B<C$ (3) $B<D<A<C$ (4) $B<D<C<A$ 305. $Given below are two statement: Statement (I): It is impossible to specify simultaneously with arbitrary precision, both the linear momentum and the position of a particle. Statement (II): If the uncertainty in the measurement of position and uncertainty in measurement of momentum are equal for an electron, then the uncertainty in the measurement of velocity is ⩾ \frac{h}{π} \times \frac{1}{2 m} . choose the correct answer from the options given below:$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are false$ (3) $Both Statement I and Statement II are true$ (4) $Statement I is true but Statement II is false$ 306. $The radiation with maximum frequency is$ (1) $X-rays$ (2) $radio waves$ (3) $UV rays$ (4) $IR rays$ 307. $Match List I with List II List - I (Element) A. N B. S C. Br D. Kr List - II (Electronic configuration) I . [Ar] 3 d^{10} 4 s^{2} 4 p^{5} AR II . [Ne] 3 s^{2} 3 p^{4} III . [He] 2 s^{2} 2 p^{3} IV . [Ar] 3 d^{10} 4 s^{2} 4 p^{6} Choose the correct answer from the options given below:$ (1) $A-III, B-II, C-I, D-IV$ (2) $A-II, B-I, C-IV, D-III$ (3) $A-I, B-IV, C-III, D-II$ (4) $A-IV, B-III, C-II, D-I$ 308. $Which one is the wrong statement?$ (1) $The uncertainty principle is ∆ E \times ∆ t \geq \frac{h}{4 π}$ (2) $Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.$ (3) $The energy of 2 s ‐orbital is less than the energy of 2 p ‐orbital in case of hydrogen like atoms.$ (4) $de‐Broglie’s wavelength is given by λ = \frac{h}{m v}, where m = mass of the particle, v = group velocity of the particle$ 309. $The statement that is not correct is$ (1) $angular quantum number signifies the shape of the orbital$ (2) $energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number$ (3) $total number of nodes for 3 s orbital is three$ (4) $the radius of the first orbit of He^{+} is half that of the first orbit of hydrogen atom.$ 310. $Given below are two statements : Statement I: When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequencies. Statement II: The frequency of second line of Balmer series obtained from He^{+} is equal to that of first line of Lyman series obtained from hydrogen atom. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are false$ 311. $Given below are two statements. Statement I: According to Bohr's model of an atom, qualitatively the magnitude of velocity of electronincreases with decrease in positive charges on the nucleus as there is no strong hold on the electron by thenucleus. Statement II: According to Bohr's model of an atom, qualitatively the magnitude of velocity of electronincreases with decrease in principal quantum number. In the light of the above statements, choose the answer from the options given below:$ (1) $Both Statement I and Statement II are false$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is false but Statement II is true$ (4) $Statement I is true but Statement II is false$ 312. $Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface. Reason R : When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Both A and R are correct and R is the correct explanation of A$ (2) $A is correct but R is not correct$ (3) $Both A and R are correct but R is NOT the correct explanation of A$ (4) $A is not correct but R is correct$ 313. $Select the correct statements from the following. A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electrons is 9.10939 \times 10^{- 31} kg . C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below.$ (1) $C, D and E$ (2) $A and E$ (3) $B, C and E$ (4) $A, B and C$ 314. $Identify the INCORRECT statements from the following:(A) Notation_{12}^{24} Mg represents 24 protons and 12 neutrons.(B) Wavelength of a radiation of frequency 4.5 \times 10^{15} s^{- 1} is 6.7 \times 10^{- 8} m .(C) One radiation has wavelength = λ_{1} (900 nm) and energy = E_{1} . Other radiation has wavelength = λ_{2} (300 nm) and energy = E_{2} . E_{1} : E_{2} = 3 : 1 .(D) Number of photons of light of wavelength 2000 pm that provides 1 J of energy is 1.006 \times 10^{16} . Choose the correct answer from the options given below:$ (1) $(B) and (C) Only$ (2) $(A) and (D) Only$ (3) $(A) and (C) Only$ (4) $(A) and (B) Only$ 315. $The isoelectronic set of ions is :$ (1) $N3-, O2-, F-and N a^{+}$ (2) $N^{3 -}, Li^{+}, Mg^{2 +} and O^{2 -}$ (3) $F-, Li+, Na+and M g^{2 +}$ (4) $L i^{+}, N a^{+}, O^{2 -} and F^{-}$ 316. $From the following energy levels of hydrogen atom, the values of E_{\infty} and E_{3} in J are, respectively______E_{\infty} = \dots \dots \dots \dots ._______E_{3} = \dots \dots \dots \dots ._______E_{2} = - 0.545 \times 10^{- 18} J_______E_{1} = - 2.18 \times 10^{- 18} J$ (1) $1, - 0.242 \times 10^{- 18}$ (2) $\infty, - 0.726 \times 10^{- 18}$ (3) $0, - 0.242 \times 10^{- 18}$ (4) $0, - 0.321 \times 10^{- 18}$ 317. $Select the correct statements from the following A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is 9.10939 \times 10^{- 31} kg . C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below:$ (1) $B, C and E only$ (2) $A, B and C only$ (3) $C, D and E only$ (4) $A and E only$ 318. $P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is 4 p r^{2} dr. The qualitative sketch of the dependence of P on r is:$ (1) (2) (3) (4) 319. $The number of radial node/s for 3 p orbital is:$ (1) $1$ (2) $4$ (3) $2$ (4) $3$ 320. $Isochores are drawn at\dots\dots\dots\dots$ (1) $constant volume, pressure vs temperature$ (2) $constant pressure, volume vs temperature$ (3) $constant temperature, pressure vs volume$ (4) $constant temperature, volume vs temperature$ 321. $The region in the electromagnetic spectrum where the Balmar series lines appear is$ (1) $Microwave$ (2) $Ultraviolet$ (3) $Visible$ (4) $Infrared$ 322. $Aqueous solution of which salt will not contain ions with the electronic configuration 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} ?$ (1) $NaCl$ (2) $C a I_{2}$ (3) $NaF$ (4) $KBr$ 323. $In a given atom no two electrons can have the same values for all the four quantum numbers. This is called$ (1) $Hund’s Rule$ (2) $Aufbau principle$ (3) $Uncertainty principle$ (4) $Pauli’s Exclusion principle.$ 324. $The number of angular and radial nodes in 3 p orbital respectively are$ (1) $3,1$ (2) $1,1$ (3) $2,1$ (4) $2,3$ 325. $An ion has 18 electrons in the outermost shell, it is$ (1) $C u^{+}$ (2) $T h^{4 +}$ (3) $C s^{+}$ (4) $K^{+}$ 326. $The number of subshells associated with n = 4 and m = - 2 quantum numbers is$ (1) $2$ (2) $8$ (3) $4$ (4) $16$ 327. $A certain orbital has no angular nodes and two radial nodes. The orbital is:$ (1) $2 s$ (2) $3 s$ (3) $3 p$ (4) $2 p$ 328. $The number of spherical nodes in 3 p orbitals are/is$ (1) $one$ (2) $three$ (3) $none$ (4) $two$ 329. $Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?$ (1) $Lyman series$ (2) $Balmer series$ (3) $Paschen series$ (4) $Brackett series$ 330. $The spectrum of He is expected to be similar to that$ (1) $H$ (2) $L i^{+}$ (3) $Na$ (4) $H e^{+}$