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

00:00
Question # 1

The configuration 1s22s22p53s1shows

Question # 2

When 3p orbital is complete, the entering electron goes into

Question # 3

The number of spherical nodes in 3p orbitals are

Question # 4

In the ground state of an atom, the electron is present:

Question # 5

Spectrum of white light is continuous becuase

Question # 6

The radius of first orbit of H-atom is

Question # 7

Charge to mass ratio of electron was discovered by:

Question # 8

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

Question # 9

The order of distance between the various Bohr orbits is

Question # 10

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 11

The quantum number which describe the orientation of the orbitals is

Question # 12

Energy of electron in first orbit of H atom is

Question # 13

Mass of simple electron is:

Question # 14

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 15

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

Question # 16

The energy of ionization of an atom is the energy difference between orbital

Question # 17

A 4f orbital has

Question # 18

The charge of an electron is determined by

Question # 19

Quantum number value for 2p orbitals are:

Question # 20

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 21

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 22

The energy of the first electron is helium will be

Question # 23

Smallest charge of electricity that has been measured so far is

Question # 24

The value of R (Rydberg's constant) is _______ m-1

Question # 25

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 26

Charge to mass ratio (e/m) of the electron is determined by

Question # 27

Their e/m, ratio resembles with that of electrons

Question # 28

The quantum number which describes the shape of the orbital is

Question # 29

Charge on electron was discovered by:

Question # 30

When 6s orbital is complete then next electron goes to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The value of R (Rydberg's constant) is _______ m-1
A. 1.0974 x 107
B. 1.0842 x 107
C. 1.082 x 10-7
D. Both a and b
2 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
3 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
4 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
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
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
6

Mass of simple electron is:
A.

9.1 x 10-31 kg

B.

9.1 x 10-30 kg

C.

1.66 x 10-31 kg

D.

9.1 x 10-31 kg
7 The value of charge on electron is
A. 1.602 x 10-19coulombs
B. 1.602 x 10-18coulombs
C. 1.602 x 10-17coulombs
D. 1.602 x 10-16 coulombs
8 The wave length of electron as wave is 0.5 nm. What is the wave length in meter
A. 5 x 10-9
B. 5 x 10-12
C. 5 x 10-6
D. 5 x 10-10
9 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
10 Which is not true with respect to cathode rays?
A. A stream of electrons
B. Charged particles
C. Move with speed as that of light
D. Can be deflected by magnetic fields

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