ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is 3 4 5 6
2 The configuration 1s22s22p53s1shows Excited state of O<sub>2</sub> Excited state of neon Excited state of fluorine Ground state of fluorine atom
3 The energy of the first electron is helium will be -13.6 eV -54.4 eV -5.44 eV zero
4 Which of the following is not isoelectronic? Na<sup>+</sup> Mg<sup>2+</sup> O<sup>2-</sup> Cl<sup>-</sup>
5 The spectrum of He is expected to be similar to that of H Na He<sup>+</sup> Li<sup>+</sup>
6 Which of the following element's outermost orbits last electron has magnetic quantum number m=0? Na O Cl N
7 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
8 In the ground state, an element has 13 electrons in its M shell. The element is Copper Chromium Nickel Iron
9 Rutherford's atomic model suggests the existence of Atom Nucleus alpha particle Measons
10 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
11 In which of the following pairs, the numbers of electrons in the outermost shell are different? As,Sb Ge,Sn In,pt Se,Te
12 The total number of orbitals possible for the quantum number n is n n<sup>2</sup> 2n 2n<sup>2</sup>
13 A 4f orbital has one node two node three node four nodes
14 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
15 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
16 Which of the following has more unpaired d-electrons? Zn<sup>+</sup> Fe<sup>2+</sup> Ni<sup>3+</sup> Cu<sup>+</sup>
17 Heaviest particle is Meson Neutron Proton Electron
18 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
19 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
20 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>
21 The quantum number which determines the shape of the orbital is principal azimuthal magnetic spin
22 Which of the following orbitals have a dumb bell shape? s p d f
23 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
24 Rutherford's experiment led to the discovery of Nucleus Electron Proton alpha particle
25 Azimuthal quantum number of last electron of 11Na is 1 2 3 0
26 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
27 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
28 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
29 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be 1 4 9 12
30 The total number of possible values of magnetic quantum number for the value of l=3 is 3 1 5 7
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