PPSC Chemistry Part I Physical Chemistry Online Test With Answers

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PPSC Chemistry Part I Physical Chemistry Online Test

Sr. # Questions Answers Choice
1 The lowest K.E. for an electron is three dime national cubic box is given by h<sup>2</sup>/ 8m<sup>a</sup> 3h<sup>2</sup> / 8 ma<sup>2</sup> 9h<sup>2</sup>/ 8ma<sup>2</sup> 16h<sup>2</sup> / 8ma<sup>2</sup>
2 Which of the flowing operator combination would yield eight value equation d/x (sin x) d/dx (cos x) d /dx (sin 4x) d /dx (cos 4x) d/dx (e<sup>x</sup>)
3 Which is the correct configuration of Fe3+ (Z= 26)? [Ar] 4s<sup>2</sup> , 3d<sup>6</sup> [Ar] 4s<sup>2</sup> , 4d<sup>5</sup> [Ar] 3d<sup>5</sup> None of these
4 The electronic configuration of chromium (Z =24) in the ground state is. [Ar] 4s<sup>2</sup> , 3d<sup>4</sup> [Ar] 3d<sup>6</sup> [Ar]4s<sup>1</sup>, 3d<sup>5</sup> [Ar]
5 The atomic orbitals are progressively filled in order of increasing energy. This statement is called as Hund's rule Aufbau's rule (n+1) rule Planck's rule
6 Which of the following sets of quantum number is possible. n = 4, l = 3, m = -3 ,s = 0 n = 4, l = 0, m = 0, s =+1/2 n = 4, l = 4, m = -4, s = -1/2 None of these
7 The maximum number of electron is an atom with l = 2 and n = 3 is 2 6 10 12
8 Which of the following sets of quantum number is possible for an electron in a 4f orbital. n = 4,l = 3, m = 4, s = +1/2 n = 4, l= 4, m = +4 , s = +1/2 n = 4, l = 3, m = +1, s = -1/2 n = 4, l = 4, m = +1 , s = -1/2
9 The maximum number of electrons in s,p,d and f sub shells are. 2 in each 2, 6, 10, 18 2,6 ,10,14 5 in each
10 Which of the following orbitals does not make sense. 6f 4f 7s 2d
11 The designation of an orbital with n =4 and l = 1 in 4 s 4 p 4 d 4 f
12 The possible sub levels in the n = 4 energy level are. s,p,d s,p,d,f s s,p
13 If Principal quantum number n = 4 the quantum number l can have calue. 1,2,3 and 4 0,1,2 and 3 1,2 and 3 only None of the abvoe
14 The maximum number of electrons in first energy levels are. 1 2 8 10
15 For each value of l. the number of m velocity are. n<sup>2</sup> 2l (2l+1) (n+1)
16 The increasing order of energies of various sub shells is 1s &lt; 2s&lt;3s&lt;2p&lt;3p&lt;4s&lt;3d 1s &lt;2s&lt;2p&lt;3s&lt;3p&lt;4s&lt;3d 1s&gt;2s&gt;2p&gt;3s&gt;3p&gt;4s&gt;3d 1s&gt;2s&gt;2p&gt;3p&gt;3d&gt;4s
17 The magnetic quantum number (m) specifies the individual orbital in a Sub shell for a given l, m can be. l,l- l........-1 l........2, l -3.......-2l l-l-2,..........-l l-2,l-4, ............-4l
18 The azimuth or angular quantum number (i) determines the number of sob shells in a given shall. the allowed values of l for a given value ffor n are. 1.2.3....................... 1,2,3 ..................(n-1) 0.1.2.3................(n-1) 2,4,6,..............(n-2)
19 The principal quantum number determines the overall size of the orbital and energy of the electron when it is associated with the orbital.It may have the values. n = 1,3,5.........infinity n= 2,4,6................infinity n = 1,2,3,4..............infinity None of the abvoe
20 Heisenberg's uncertainty principle precludes the exact simultaneous measurement of. Velocity and energy Velocity and time Charge density and probability Position and momentum
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