ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

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Question # 1

The charge of an electron is determined by

Question # 2

Heaviest particle is

Question # 3

The orbital in Rutherford's model is

Question # 4

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 5

Pauli's principle is applicable to

Question # 6

Schrodinger wave equation describes electron completely because

Question # 7

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 8

The e.m value for positive rays maximum for:

Question # 9

The energy of the first electron is helium will be

Question # 10

Which of the following particles has longest wavelength, if they have same speed:

Question # 11

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 12

The charge over mass ratio of electron is:

Question # 13

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 14

Smallest charge of electricity that has been measured so far is

Question # 15

The orbitals having n + l = 5 are

Question # 16

Balmer's series is in ______ region

Question # 17

Which of the following is not a sub-atomic particle

Question # 18

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 19

Spectrum of white light is continuous becuase

Question # 20

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 21

The range of visible spectrum is

Question # 22

The nature of positive ray depend on:

Question # 23

The radius of first orbit of hydrogen atom

Question # 24

Energy of electron in first orbit of H atom is

Question # 25

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 26

The radius of second Bohr's orbit is

Question # 27

Charge to mass ratio of electron was discovered by:

Question # 28

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 29

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Energy of electron in an orbit according to Bohr theory is negative due to
A. Repulsion of electrons in the same orb
B. At infinity energy is zero ad a traction towards nucleus decreases energy
C. Electron has negative charge
D. Product of positive nuclear charge and negative charge is negative
2 Energy of electron in first orbit of H atom is
A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole
3 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
4 Azimuthal quantum number of last electron of 11Na is
A. 1
B. 2
C. 3
D. 0
5 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
6 Light emitted from a source has its wave length 500nm, then its wave number will be
A. 2 x 106m-1
B. 2 x 107m-1
C. 5 x 108 m-1
D. 5 x 109m-1
7 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
8 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
9 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
10 Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called
A. Stark effect
B. Zeeman effect
C. Compton effect
D. Photoelectric effect

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