Atomic Structure PYQs Set 11 (PDF)

Set 11 of 14 · Questions 301-330 of 415

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Atomic Structure · Set 11 (Q301-330)
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301. $If uncertainty in position and momentum are equal, then uncertainty in velocity is$ (1) $\frac{1}{m} \frac{h}{π}$ (2) $\frac{h}{π}$ (3) $\frac{1}{2 m} \frac{h}{π}$ (4) $\frac{h}{2 π}$ 302. $The graph between (ψ)^{2} and r (radial distance) is shown below. This represents :$ (1) $3s orbital$ (2) $2s orbital$ (3) $1s orbital$ (4) $2p orbital$ 303. $For hydrogen like species, which of the following graphs provides the most appropriate representation of E vs Z plot for a constant n? [E: Energy of the stationary state, Z: atomic number, n = principal quantum number]$ (1) (2) (3) (4) 304. $The ionization enthalpy of hydrogen atom is 1.312 \times 1 0^{6} J m o l^{-1} . The energy required to excite the electron in the atom from n_{1} = 1 to n_{2} = 2 is$ (1) $8.51 \times 1 0^{5} J m o l^{-1}$ (2) $6.56 \times 1 0^{5} J m o l^{-1}$ (3) $7.56 \times 1 0^{5} J m o l^{-1}$ (4) $9.84 \times 1 0^{5} J m o l^{-1}$ 305. $The orbital angular momentum for an electron revolving in an orbit is given by ℓ (ℓ + 1) \frac{h}{2 π} . This momentum for an s-electron will be given by$ (1) $+ \frac{1}{2} . \frac{h}{2 π}$ (2) $Zero$ (3) $\frac{h}{2 π}$ (4) $2. \frac{h}{2 π}$ 306. $Uncertainty in position of an electron (mass = 9.1 \times 1 0^{- 28} g) moving with a velocity of 3 \times 1 0^{4} c m / s accurate up to 0.001% will be (Use h l_{(} 4_{)} in uncertainty expression where h = 6.626 \times 1 0^{- 27} erg second)$ (1) $5.76 cm$ (2) $7.68 cm$ (3) $1.93 cm$ (4) $3.84 cm$ 307. $Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from n=4 to n = 2 of H e^{+} spectrum$ (1) $n = 2ton= 1$ (2) $n = 1 to n = 3$ (3) $n = 1 to n = 2$ (4) $n = 3 to n = 4$ 308. $According to the wave-particle duality of matter by de-Broglie, which of the following graph plot presents most appropriate relationship between wavelength of electron (λ) and momentum of electron (p) ?$ (1) (2) (3) (4) 309. $Correct statements for an element with atomic number 9 are: (A) There can be 5 electrons for which m_{s} = + \frac{1}{2} and 4 electrons for which m_{s} = - \frac{1}{2} .(B) There is only one electron in p_{z} orbital.(C) The last electron goes to orbital with n = 2 and l = 1 .(D) The sum of angular nodes of all the atomic orbitals is 1. Choose the correct answer from the options given below:$ (1) $A and B Only$ (2) $A. C and D Only$ (3) $A and C Only$ (4) $C and D Only$ 310. $Find the number of unpaired electrons for copper in ground state configuration.$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 311. $The uncertainty in momentum of an electron is 1 \times 1 0^{- 5} kg m / s . The uncertainty in its position will be (h = 6.62 \times 1 0^{- 34} kg m^{2} / s)$ (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) $5. 25 \times 1 0^{- 28} m$ 312. $Which of the following is the correct plot for the probability density as a function of distance V of the electron form the nucleus for 2s orbital?$ (1) (2) (3) (4) 313. $For given energy, E = 3.03 \times 1 0^{- 19} Joules corresponding wavelength is (h = 6.626 \times 1 0^{- 34} J sec, c = 3 \times 1 0^{8} m / sec)$ (1) $65.6 nm$ (2) $6.56 nm$ (3) $3.4 nm$ (4) $656 nm$ 314. $For emission line of atomic hydrogen from ni = 8 to n_{f} = n, the plot of wave number (ν) against (\frac{1}{n ^{2}}) will be (The Rydberg constant, R_{H} is in wave number unit$ (1) $Linear with intercept - R_{H}$ (2) $Linear with slope - R_{H}$ (3) $Non linear$ (4) $Linear with slope R_{H}$ 315. $Which of the following is not permissible arrangement of electrons in an atom?$ (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) $n = 4, l = 0, m = 0, s = - 1/2$ 316. $Maximum number of electrons in a subshell of an atom is determined by the following$ (1) $2 l + 1$ (2) $4 l - 2$ (3) $2 n^{2}$ (4) $4 l + 2$ 317. $Which of the following nuclear reactions will generate an isotope?$ (1) $Neutron particle emission$ (2) $Positron emission$ (3) $α-particle emission$ (4) $β-particle emission$ 318. $The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is$ (1) $5, 1, 1, + 1/2$ (2) $6, 0, 0, + 1/2$ (3) $5, 0, 0, + 1/2$ (4) $5, 1, 0, + 1/2$ 319. $Which one of the following species doesn't have a magnetic moment of 1.73BM, (spin only value) ?$ (1) $O_{2}^{+}$ (2) $CuI$ (3) $[C u (N H_{3})_{4}] C l_{2}$ (4) $O_{2}^{-}$ 320. $For which of the following sets of four quantum numbers, an electron will have the highest energy? n l m s$ (1) $3 2 1 + 1/2$ (2) $4 2 - 1 + 1/2$ (3) $4 1 0 - 1/2$ (4) $5 00 - 1/2$ 321. $If the radius of the 3^{r d} Bohr's orbit of hydrogen atom is r_{3} and the radius of 4^{t h} Bohr's orbit is r_{4} . Then :$ (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) $r_{4} = \frac{4}{3} r_{3}$ 322. $In the nuclear transmutation_{4}^{9} Be + X ⟶_{4}^{8} Be + Y (X, Y) is (are) :$ (1) $(γ, n)$ (2) $(p, D)$ (3) $(n, D)$ (4) $(γ, p)$ 323. $Ionization energy of H e^{+} is 19.6 \times 1 0^{-18} J a t o m^{-1} . The energy of the first stationary state (n = 1) of L i^{2 +} is:$ (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) $8.82 \times 1 0^{-17} J a t o m^{-1}$ 324. $What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it'saqueous solution?$ (1) $5.92$ (2) $5$ (3) $Zero$ (4) $5.26$ 325. $The spin only magnetic moments (in BM) for free T i^{3 +}, V^{2 +} and S c^{3 +} ions respectively are (At.No. Sc: 21, Ti: 22, V:23)$ (1) $3.87, 1.73, 0$ (2) $1.73, 3.87, 0$ (3) $1.73, 0, 3.87$ (4) $0,3.87,1.73$ 326. $The electron in the n^{t h} orbit of L i^{2 +} is excited to (n + 1) orbit using the radiation of energy 1.47 x 1 0^{- 17} J (as shown in the diagram). The value of n is Given : R_{H} = 2.18 x 1 0^{- 18} J$ 327. $A hypothetical electromagnetic wave is show below. The frequency of the wave is x \times 10^{19} Hz . x =__________(nearest integer)$ 328. $How many of the following metal ions have similar value of spin only magnetic moment in gaseous state ?___________(Given: Atomic number : V 23 ; Cr, 24 ; Fe, 26 ; Ni, 28) V^{3 +} . C r^{3 +}, F e^{2 +}, N i^{3 +}$ 329. $When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are_____$ 330. $If the wavelength for an electron emitted from H-atom is 3. 3 x 1 0^{- 10} m, then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is _____times. (Nearest integer).[Given :h = 6.626 x 1 0^{- 34} Js, Mass of electron = 9. 1 x 1 0^{- 31}]$