1) What is the four basic quantum numbers? (4 answer) a) Principal Quantum Number,n b) Angular momentum Quantum Number, l c) Effective Nuclear Charge , Zeff d) Magnetic Quantum Number,m e) Electron Spin Quantum number, s f) Molarity , M 2) Find ONE possible quantum numbers for an electron 3s. (1 answer) a) n=3 l=0 m=0 s=+1/2 b) n=3 l=2 m=+2 s=+1/2 c) n=2 l=0 m=0 s=+1/2 d) n=1 l=1 m=+1 s=+3/4 3) List all possible quantum numbers of an electron in 4p orbitals (4 answer) a) n=4 b) n=2 c) l=1 d) s=+1/2 e) m=+1 f) s=-2/4 4) Which of the following quantum numbers is allowed ? ( 4 answer ) a) 1s b) 3s c) 2d d) 2p e) 5f f) 1p 5) Which of the following is drawing shape of 4d x 2 - y 2 (1 answer) a) b) c) d) 6) Which of the following statements does not form a part of Bohr's model of hydrogen atom? ( 1 answer ) a) Energy of the electrons in the orbit is quantised b) The electron in the orbit nearest the nucleus has the lowest energy c) Electrons resolve in different orbits around the nucleus. d) The position and valocity of the electrons in the orbit cannot be determined simultaneously 7) Ionisation of hydrogen atom can be calculated by using the following method, EXCEPT ( 1 answer ) a) use the Rydberg expression where ni=1 and nf=∞  b) use the covergence limit that can be found in the Balmer series c) use the wavelength of the last line in the Lyman series d) use the convergence limit of the UV spectrum 8) Which of the following statements in relation to the hydrogen atom is correct? ( 1 answer ) a) 3s orbital is lower in energy than 3p orbital b) 3p orbital is lower in energy than 3d orbital c) 3s and 3p orbitals are of lower energy than 3d orbital d) 3s, 3p and 3d orbitals all have the same energy 9) Maximum number of electrons in a subshell with l = 3 and n = 4 is ( 1 answer ) a) 10 b) 15 c) 9 d) 14 10) Which of the following quantum number explain the orientation of orbital? ( 1 answer ) a) Principle quantum number b) Angular momentum quantum number c) Electron spin quantum number d) Magnetic quantum number

QUANTUM MECHANICS

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