Atomic Structure PYQs Set 10 (PDF)

Set 10 of 12 · Questions 271-300 of 359

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Mere Teacher · Previous Year Questions NEET Chemistry · Atomic Structure · Set 10 (Q271-300)
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271. $According to the wave-particle duality of matter by de-Broglie, which of the following graph plot presents most appropriate relationship between wavelength of electron (λ) and momentum of electron (p) ?$ (1) (2) (3) (4) 272. $Correct statements for an element with atomic number 9 are: (A) There can be 5 electrons for which m_{s} = + \frac{1}{2} and 4 electrons for which m_{s} = - \frac{1}{2} .(B) There is only one electron in p_{z} orbital.(C) The last electron goes to orbital with n = 2 and l = 1 .(D) The sum of angular nodes of all the atomic orbitals is 1. Choose the correct answer from the options given below:$ (1) $A and B Only$ (2) $A. C and D Only$ (3) $A and C Only$ (4) $C and D Only$ 273. $Find the number of unpaired electrons for copper in ground state configuration.$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 274. $The uncertainty in momentum of an electron is 1 \times 1 0^{- 5} kg m / s . The uncertainty in its position will be (h = 6.62 \times 1 0^{- 34} kg m^{2} / s)$ (1) $5.27 \times 1 0^{- 30} m$ (2) $1. 05 \times 1 0^{- 26} m$ (3) $1. 05 \times 1 0^{- 28} m$ (4) $5. 25 \times 1 0^{- 28} m$ 275. $Which of the following is the correct plot for the probability density as a function of distance V of the electron form the nucleus for 2s orbital?$ (1) (2) (3) (4) 276. $For given energy, E = 3.03 \times 1 0^{- 19} Joules corresponding wavelength is (h = 6.626 \times 1 0^{- 34} J sec, c = 3 \times 1 0^{8} m / sec)$ (1) $65.6 nm$ (2) $6.56 nm$ (3) $3.4 nm$ (4) $656 nm$ 277. $For emission line of atomic hydrogen from ni = 8 to n_{f} = n, the plot of wave number (ν) against (\frac{1}{n ^{2}}) will be (The Rydberg constant, R_{H} is in wave number unit$ (1) $Linear with intercept - R_{H}$ (2) $Linear with slope - R_{H}$ (3) $Non linear$ (4) $Linear with slope R_{H}$ 278. $Which of the following is not permissible arrangement of electrons in an atom?$ (1) $n = 5, l = 3, m = 0, s = + 1/2$ (2) $n = 3, l = 2, m = - 3, s = - 1/2$ (3) $n = 3, l = 2, m = - 2, s = - 1/2$ (4) $n = 4, l = 0, m = 0, s = - 1/2$ 279. $Maximum number of electrons in a subshell of an atom is determined by the following$ (1) $2 l + 1$ (2) $4 l - 2$ (3) $2 n^{2}$ (4) $4 l + 2$ 280. $Which of the following nuclear reactions will generate an isotope?$ (1) $Neutron particle emission$ (2) $Positron emission$ (3) $α-particle emission$ (4) $β-particle emission$ 281. $The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is$ (1) $5, 1, 1, + 1/2$ (2) $6, 0, 0, + 1/2$ (3) $5, 0, 0, + 1/2$ (4) $5, 1, 0, + 1/2$ 282. $Which one of the following species doesn't have a magnetic moment of 1.73BM, (spin only value) ?$ (1) $O_{2}^{+}$ (2) $CuI$ (3) $[C u (N H_{3})_{4}] C l_{2}$ (4) $O_{2}^{-}$ 283. $For which of the following sets of four quantum numbers, an electron will have the highest energy? n l m s$ (1) $3 2 1 + 1/2$ (2) $4 2 - 1 + 1/2$ (3) $4 1 0 - 1/2$ (4) $5 00 - 1/2$ 284. $If the radius of the 3^{r d} Bohr's orbit of hydrogen atom is r_{3} and the radius of 4^{t h} Bohr's orbit is r_{4} . Then :$ (1) $r_{4} = \frac{9}{16} r_{3}$ (2) $r_{4} = \frac{16}{9} r_{3}$ (3) $r_{4} = \frac{3}{4} r_{3}$ (4) $r_{4} = \frac{4}{3} r_{3}$ 285. $Ionization energy of H e^{+} is 19.6 \times 1 0^{-18} J a t o m^{-1} . The energy of the first stationary state (n = 1) of L i^{2 +} is:$ (1) $4.41 \times 1 0^{-16} J a t o m^{-1}$ (2) $- 4.41 \times 1 0^{-17} J a t o m^{-1}$ (3) $- 2.2 \times 1 0^{-15} J a t o m^{-1}$ (4) $8.82 \times 1 0^{-17} J a t o m^{-1}$ 286. $What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it'saqueous solution?$ (1) $5.92$ (2) $5$ (3) $Zero$ (4) $5.26$ 287. $The spin only magnetic moments (in BM) for free T i^{3 +}, V^{2 +} and S c^{3 +} ions respectively are (At.No. Sc: 21, Ti: 22, V:23)$ (1) $3.87, 1.73, 0$ (2) $1.73, 3.87, 0$ (3) $1.73, 0, 3.87$ (4) $0,3.87,1.73$ 288. $Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect? (Bohr's radius is represented by a_{0})$ (1) $The probability density of finding the electron is maximum at the nucleus$ (2) $The total energy of the electron is maximum when it is at a distance a_{0} from the nucleus$ (3) $The electron can be found at a distance 2 a_{0} from the nucleus$ (4) $The 1 s orbital is spherically symmetrical$ 289. $What will be the longest wavelength line in Balmer series of spectrum?$ (1) $546 nm$ (2) $656 nm$ (3) $566 nm$ (4) $556 nm$ 290. $Which of the following set a of quantum numbers is correct for an electron in 4f orbital?$ (1) $n = 4, l =3, m = +4, s = +1/2$ (2) $n = 4, l = 4, m = -4, s = -1/2$ (3) $n = 4, l = 3, m = +1, s = +1/2$ (4) $n = 3, l=2, m =-2, s = +1/2$ 291. $The de Broglie wavelength (λ) associated with a photoelectron varies with the frequency (v) of the incident radiation as, [v_{0} is threshold frequency] :$ (1) $λ \frac{1}{( v - v _{0} ) ^{\frac{3}{2}}}$ (2) $λ \frac{1}{( v _{0} - v _{0} )}$ (3) $λ \frac{1}{( v - v _{0} ) ^{\frac{1}{2}}}$ (4) $λ \frac{1}{( v - v _{0} ) ^{\frac{1}{4}}}$ 292. $In hydrogen atom, energy of first excited state is - 3.4 e V . Then find out K.E. of same orbit of hydrogen atom$ (1) $+ 3.4 e V$ (2) $+ 6.8 e V$ (3) $- 13.6 e V$ (4) $+ 13.6 e V$ 293. $A 0.66 kg ball is moving with a speed of 100 m / s . The associated wavelength will be (h = 6.6 \times 1 0^{- 34} J s)$ (1) $6.6 \times 1 0^{- 32} m$ (2) $6.6 \times 1 0^{- 34} m$ (3) $1.0 \times 1 0^{- 35} m$ (4) $1.0 \times 1 0^{- 32} m$ 294. $Consider the following complex ions P = (FeF_{6})^{3 -} Q = (V (H_{2} O)_{6})^{2 +} R = (Fe (H_{2} O)_{6})^{2 +} The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is :$ (1) $R < Q < P$ (2) $R < P < Q$ (3) $Q < R < P$ (4) $Q < P < R$ 295. $The electrons are more likely to be found :$ (1) $in the region a and c$ (2) $in the region a and b$ (3) $only in the region a$ (4) $only in the region c$ 296. $According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?$ (1) $n = 6 to n = 1$ (2) $n = 5 to n = 4$ (3) $n = 6 to n = 5$ (4) $n = 5 to n = 3$ 297. $The radius of hydrogen atom in the ground state is 0.53 Å. The radius o f L i^{2 +} ion (atomic number = 3) in a similar state is$ (1) $0.53 Å$ (2) $1.06 Å$ (3) $0.17 Å$ (4) $0.265 Å$ 298. $In a Bohr’s model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed?$ (1) $2. 389 \times 1 0^{- 12} ergs$ (2) $0. 239 \times 1 0^{- 10} ergs$ (3) $2. 15 \times 1 0^{- 11} ergs$ (4) $0. 1936 \times 1 0^{- 10} ergs$ 299. $Identify the incorrect statements from the following.$ (1) $The shapes of d_{xy}, d_{yz}, and d_{zx} orbitals are similar to each other; and d_{x^{2} - y^{2}} and d_{z^{2}} are similar to each other.$ (2) $All the five 5d orbitals are different in size when compared to the respective 4 d orbitals.$ (3) $All the five 4d orbitals have shapes similar to the respective 3 d orbitals.$ (4) $In an atom, all the five 3d orbitals are equal in energy in free state.$ 300. $Consider the following sets of quantum numbers: n l m s (i) 3 00 + 1/2 (ii) 2 2 1 + 1/2 (iii) 4 3 - 2 - 1/2 (iv) 1 0 - 1 - 1/2 (v) 3 2 3 + 1/2 Which of the following sets of quantum number is not possible?$ (1) $(i), (ii), (iii) and (iv)$ (2) $(ii), (iv) and (v)$ (3) $(i) and (iii)$ (4) $(ii), (iii) and (iv)$