ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Which of the following is not isoelectronic? Na<sup>+</sup> Mg<sup>2+</sup> O<sup>2-</sup> Cl<sup>-</sup>
2 The spectrum of He is expected to be similar to that of H Na He<sup>+</sup> Li<sup>+</sup>
3 Which of the following element's outermost orbits last electron has magnetic quantum number m=0? Na O Cl N
4 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
5 In the ground state, an element has 13 electrons in its M shell. The element is Copper Chromium Nickel Iron
6 Rutherford's atomic model suggests the existence of Atom Nucleus alpha particle Measons
7 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
8 In which of the following pairs, the numbers of electrons in the outermost shell are different? As,Sb Ge,Sn In,pt Se,Te
9 The total number of orbitals possible for the quantum number n is n n<sup>2</sup> 2n 2n<sup>2</sup>
10 A 4f orbital has one node two node three node four nodes
11 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
12 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
13 Which of the following has more unpaired d-electrons? Zn<sup>+</sup> Fe<sup>2+</sup> Ni<sup>3+</sup> Cu<sup>+</sup>
14 Heaviest particle is Meson Neutron Proton Electron
15 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
16 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
17 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>
18 The quantum number which determines the shape of the orbital is principal azimuthal magnetic spin
19 Which of the following orbitals have a dumb bell shape? s p d f
20 The total number of orbitals in a shell with principal quantum number 'n' is 2n 2n<sup>2</sup> n<sup>2</sup> n + 1
21 Rutherford's experiment led to the discovery of Nucleus Electron Proton alpha particle
22 Azimuthal quantum number of last electron of 11Na is 1 2 3 0
23 For which of the following sets of quantum numbers and electron will have the highest energy? 3,2,1,1/2 4,2,-1,1/2 4,1,0,-1/2 5,0,0,1/2
24 The radius of second Bohr's orbit is 0.053 nm 0.053/4 nm 0.053 x 4 nm 0.053 x 20 nm
25 The electron in an atom moves randomly around the nucleus has fixed space around the nucleus is stationary in various energy levels moves around its nucleus in definite energy levels
26 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be 1 4 9 12
27 The total number of possible values of magnetic quantum number for the value of l=3 is 3 1 5 7
28 The electronic configuration of an atom/ion can be defined by the following Aufbau principle Pauli's exclusion principle Hund's Rule All the above
29 Number of neutrons in heavy hydrogen atom is 0 1 2 3
30 The number of spherical nodes in 3p orbitals are One Three Non Two
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