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25. The radius of first orbital of hydrogen atom is
0.00530 nm. The radius of second orbital of He will
be
(1)0.265 nm,
(iii) 1.1016 nim
(ii) 0.0530 nm,
26. The electronic configuration of an element is
(iv)0,2120 nm
18228?2p 3s23p%3d4s'. it shows
(i) Its ground state, (ii) Its excited state
(iii) Its cationic state (iv) Its aniomo state
27. Magnetic quantum number is related with-
(i) Size (ii) shape (iii) orientation (iv) spin
28. One p-orbital contains -
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(i) 4 electrons,
(ii) 6 electrons
(iii) 2 electrons with parallel spins
(iv) 2 electrons with antiparallel spins
29. According to uncertainty principles.
(i) E=mc2
(ii) Ax* Ap
h
,
2.76
DOM
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(iii) 4 h
(iv) Ax x Apes ,
67
30. The energy of second Bohr orbit of the hydrogen
atom is-328 KM mol-1, hence the energy of fourth /
Bohr orbit would be
(11)-1312KJ mol"!
(1) -41 K mol
diis-164 KJ tol", (iv) -82 KJ mol"!
31. Aufbau's principle is not applicable for
(ii) Cu and Cr,
d) Cu and Ar,
la Cr and Ar,
(iv) Fe and Ag
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