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 number of neutrons in the element 94Be is

Question # 2

The mass of the neutron is of the order of

Question # 3

Which of the following has more unpaired d-electrons?

Question # 4

The orbital in Rutherford's model is

Question # 5

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 6

The radiations with wavelength shorter than violet light are called

Question # 7

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

Question # 8

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 # 9

Rutherford's experiment led to the discovery of

Question # 10

Orbital having same energy is called:

Question # 11

The principle quantum number describes

Question # 12

Which of the following orbitals have a dumb bell shape?

Question # 13

The radius of first orbit of H-atom is

Question # 14

Number of neutrons in heavy hydrogen atom is

Question # 15

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 16

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

Question # 17

Effective magnetic moment of Sc3+ion is

Question # 18

The value of charge on electron is

Question # 19

Their e/m, ratio resembles with that of electrons

Question # 20

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 21

The size of electronic shell is described by

Question # 22

Proton was discovered by:

Question # 23

The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 24

Cathode rays emitted from cathode are

Question # 25

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 26

The number of spherical nodes in 3p orbitals are

Question # 27

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Question # 28

Which of the following is not a sub-atomic particle

Question # 29

Anode is the surface on which probability of finding electron is:

Question # 30

Pauli's principle is applicable to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
2 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
3 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
4 The radius of second Bohr's orbit is
A. 0.053 nm
B. 0.053/4 nm
C. 0.053 x 4 nm
D. 0.053 x 20 nm
5 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays
6 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2
7 Which of the following orbitals have a dumb bell shape?
A. s
B. p
C. d
D. f
8 The order of distance between the various Bohr orbits is
A. r2- r1> r3- r2> r4- r3> ......
B. r1> r2> r2- r3> r4-r3> .....
C. r2-r1= r3- r2= r4- r3> .....
D. r2- r1> r3- r2< r4- r3< ....
9 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
10 Splitting of spectral lines when atoms are subjected to strong electron field is called
A. Zeeman effect
B. Stark effect
C. Photoelectric effect
D. Compton effect

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