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

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 2

The size of electronic shell is described by

Question # 3

Quantum number value for 2p orbitals are:

Question # 4

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 5

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 6

The credit of discovering neutron goes to

Question # 7

Schrodinger wave equation describes electron completely because

Question # 8

Energy of electron in first orbit of H atom is

Question # 9

A 4f orbital has

Question # 10

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 11

1 erg of energy corresponds to

Question # 12

The ratio of the ionization energy of H and Be3+is

Question # 13

When the 6d orbital is completed the entering electron goes into

Question # 14

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 15

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 16

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 17

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

Question # 18

The radius of first orbit of hydrogen atom

Question # 19

When potassium metal is exposed to violet light

Question # 20

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

Question # 21

Mass of simple electron is:

Question # 22

Photons of yellow colour are ______ energetic than violet colour

Question # 23

Which is not true with respect to cathode rays?

Question # 24

The electron in an atom

Question # 25

Neutrons was discovered by

Question # 26

Cathode rays emitted from cathode are

Question # 27

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

Question # 28

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 29

Which of the following is not isoelectronic?

Question # 30

Bohr model of atom is contradicted by:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25
A. 3.0 BM
B. 4.9 BM
C. 5.9 BM
D. 6.9 BM
2 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
3 The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is
A. 3
B. 4
C. 5
D. 6
4 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
5 The ratio of the ionization energy of H and Be3+is
A. 1 : 1
B. 1 : 3
C. 1 : 9
D. 1 : 16
6 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
7 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
8 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
9 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
10 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°

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