ECAT Chemistry Online Test With Answers

image
image
image

ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is Sigma bond Pi bond Ionic bond Non-polar bond
2 One of the following bonds is polar but compound is non-polar H<sub>2</sub>O NH<sub>3</sub> HCl CO<sub>2</sub>
3 The bond order for He2molecule is zero 1/2 1 2
4 Tripple bond is present in O<sub>2</sub> H<sub>2</sub> N<sub>2</sub> Cl<sub>2</sub>
5 Coordinate covalent bond is present in the molecules H<sub>2</sub>O BF<sub>3</sub> SiO<sub>2</sub> SO<sub>2</sub>
6 The bond order O2molecule is 1 2 3 Zero
7 Which is made by coordinate covalent bond H<sub>3</sub>O<sup>+</sup> H<sub>2</sub>O CH<sub>4</sub> HCl
8 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as Balmer series Lyman series Pfund series Brackett series
9 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as Paschen Pfund Balmer Brackett
10 Photons of yellow colour are ______ energetic than violet colour More Less Equal None
11 The quantum number which describe the orientation of the orbitals is Spin quantum number Principle quantum number Azimathal quantum number Magnetic quantum number
12 The quantum number which describes the shape of the orbital is Principle quantum number Spin quantum number Azimathal quantum number Magnetic quantum number
13 Balmer's series is in ______ region Visible U V I. R. None
14 The range of visible spectrum is 300 - 600 nm 600 - 900 nm 400 - 750 nm 100 - 300 nm
15 n + l value for 4f will 2 5 7 9
16 Neutrons was discovered by Mosely Milliken Chadwick Ruherford
17 Charge to mass ratio (e/m) of the electron is determined by R. A. Millikan J. J. Thompson G. J, Stoney None of these
18 Cathode rays emitted from cathode are Canal rays Protons Electrons Positrons
19 The value of R (Rydberg's constant) is _______ m-1 1.0974 x 107 1.0842 x 107 1.082 x 10-7 Both a and b
20 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration Nitrogen Carbon Fluorine Oxygen
21 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to Hund's rule Pauli exclusion principle Aufbau principle Mosley's law
22 An electron with n = 3 , l = 2 will be in the sub-shell 3p 3d 3f 3s
23 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be 0, 1, 2, 3 +3, +2, +1, -1, -2, -3 0, -1, -2 ,-3 -3, 0, +3
24 The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is Microwave &gt; infrared &gt; visible &gt; ultraviolet Visible &gt; ultraviolet &gt; microwave &gt; infrared Ultraviolet &gt; visible &gt; infrared &gt; microwave Infrared &gt; microwave &gt; ultraviolet &gt; visible
25 Which have better penetrating power Alpha rays Beta rays Gamma rays X-rays
26 The radiations with wavelength shorter than violet light are called Ultraviolet Infrared Microwave Radio frequency
27 Spectrum of white light is continuous becuase Colors separated by dark spaces There are no boundary lines between the colours The radiations are in infrared region The radiatins fall in ultraviolet region
28 The number of isotopes of gold is 3 1 2 4
29 Isotopes of an element differ in Number of protons Number of electrons Number of neutrons Number of electrons and protons
30 The phenomenon of isotropy was first discovered by Soddy Rutherford Bohr Dalton
Download This Set
×