ECAT Chemistry Chapter 5 Atomic Structure Online Test With Answers

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ECAT Chemistry Chapter 5 Atomic Structure Online Test

Sr. # Questions Answers Choice
1 When potassium metal is exposed to violet light Ejection of electrons takes place Ejection of some potassium atoms occurs There is no effect The absorption of electrons takes place
2 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25 3.0 BM 4.9 BM 5.9 BM 6.9 BM
3 What is the packet of energy called? Electron Photon Positron Proton
4 Effective magnetic moment of Sc3+ion is 1.73 0 5.92 2.83
5 Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively 12 and 4 16 and 5 16 and 4 12 and 5
6 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is 2,1,0 2,1,1 3,1,1 3,2,1
7 For principle quantum number n=4, the total number of orbitals having l = 3 is 3 7 5 9
8 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element? 6 11 17 23
9 The orbital in Rutherford's model is Spiral Circular Both None
10 The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is 3 4 5 6
11 The configuration 1s22s22p53s1shows Excited state of O<sub>2</sub> Excited state of neon Excited state of fluorine Ground state of fluorine atom
12 The energy of the first electron is helium will be -13.6 eV -54.4 eV -5.44 eV zero
13 Which of the following is not isoelectronic? Na<sup>+</sup> Mg<sup>2+</sup> O<sup>2-</sup> Cl<sup>-</sup>
14 The spectrum of He is expected to be similar to that of H Na He<sup>+</sup> Li<sup>+</sup>
15 Which of the following element's outermost orbits last electron has magnetic quantum number m=0? Na O Cl N
16 Which is not true with respect to cathode rays? A stream of electrons Charged particles Move with speed as that of light Can be deflected by magnetic fields
17 In the ground state, an element has 13 electrons in its M shell. The element is Copper Chromium Nickel Iron
18 Rutherford's atomic model suggests the existence of Atom Nucleus alpha particle Measons
19 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the Fourth Bohr orbit to the first Bohr orbit Fifth Bohr orbit to the second Bohr orbit Sixth Bohr orbit to the third Bohr orbit Seventh Bohr orbit to the third Bohr orbit
20 In which of the following pairs, the numbers of electrons in the outermost shell are different? As,Sb Ge,Sn In,pt Se,Te
21 The total number of orbitals possible for the quantum number n is n n<sup>2</sup> 2n 2n<sup>2</sup>
22 A 4f orbital has one node two node three node four nodes
23 1 erg of energy corresponds to 6.02 x 10<sup>23</sup>J/mol 6.02 x 10<sup>16</sup>J/mol 1 erg/mol 10<sup>-7</sup>J/mol
24 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is 6.63 x 10<sup>-33</sup>m 6.63 x 10<sup>-34</sup>m 6.63 x 10<sup>-35</sup>m 6.65 x 10<sup>-35</sup>m
25 Which of the following has more unpaired d-electrons? Zn<sup>+</sup> Fe<sup>2+</sup> Ni<sup>3+</sup> Cu<sup>+</sup>
26 Heaviest particle is Meson Neutron Proton Electron
27 The four quantum numbers of the valency electron of potassium are 4,1,1,1/2 4,0,0,1/2 4,1,0,1/2 4,4,0,1/2
28 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively 3 and 5 3 and 7 3 and 9 2 and 5
29 If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be 3 x a<sub>o</sub> 6 x a<sub>o</sub> 9 x a<sub>o</sub> 1/2 x a<sub>o</sub>
30 The quantum number which determines the shape of the orbital is principal azimuthal magnetic spin
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