Structure of Atom
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Structure of Atom
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25 Questions

1. The orbitals are called degenerate when[1996]
2. The total number of electrons that can beaccommodated in all the orbitals havingprincipal quantum number 2 and azimuthalquantum number 1 is [1990]
3. Which value is closest to the wavelength in nanometerof a quantum of light with frequency of 6 × 1015s-“1? [2013]
4. Uncertainty in position of an electron (mass= 9.1 × 10-“28 g) moving with a velocity of 3 × 104cm/s accurate upto %0.001 will be (use h/4 Ï€)in uncertainty expression where h = 6.626 ×10-“27 erg-second) [1995]
5. In a given atom no two electrons can have thesame values for all the four quantum numbers.This is called [1991]
6. If r is the radius of the first orbit - the radius ofnth orbit of H-atom is given by [1988]
7. If ionization potential for hydrogen atom is13.6 eV - then ionization potential for He + will be[1993]
8. According to Bohr-™s theory the energyrequired for an electron in the Li 2+ ion to beemitted from n = 2 state is (given that theground state ionization energy of hydrogenatom is 13.6 eV) [1999]
9. The electron was shown experimentally tohave wave properties by [1994]
10. The position of both - an electron and ahelium atom is known within 1.0 nmFurtherthe momentum of the electron is known within5.0 × 10-“26 kg ms-“ 1The minimum uncertainty inthe measurement of the momentum of thehelium atom is [1998]
11. Number of unpaired electrons in N 2+ is[1989]
12. The measurement of the electron position ifassociated with an uncertainty in momentum - which is equal to 1 × 10-“18 g cm s-“1Theuncertainty in electron velocity is - (mass of anelectron is 9 × 10-“28 g) [2008]
13. The ions O2-“ - F -“ - Na+ - Mg2+ and Al3+ areisoelectronicTheir ionic radii show [2003]
14. The spectrum of He is expected to be similarto that [1988]
15. The ion that is isoelectronic with CO is[1997]
16. The order of filling of electrons in theorbitals of an atom will be [1991]
17. The energy absorbed by each molecule (A 2)of a substance is 4.4 × 10-“19 Jand bond energyper molecule is 4.0 × 10-“19 JThe kinetic energyof the molecule per atom will be: [2009]
18. Which of the following species has four lonepairs of electrons? [1993]
19. A 066kg ball is moving with a speed of 100m/sThe associated wavelength will be ( h=6.6 ×10-34 Js) [2011]
20. Which of the following is not permissiblearrangement of electrons in an atom? [2009]
21. Set of isoelectronic species is [2000]
22. If electron has spin quantum number + 2/1and a magnetic quantum number -1 - it cannot bepresent in [1994]
23. The following quantum numbers arepossible for how many orbital n = 3 - l = 2 - m =+2? [2001]
24. Maximum number of electrons in a subshellof an atom is determined by the following:[2009]
25. In hydrogen atom - energy of first excitedstate is -“3.4 eV. Find out KEof the same orbit of Hydrogen atom [2002]

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