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

Balmer's series is in ______ region

Question # 2

The orbitals having n + l = 5 are

Question # 3

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question # 4

The radius of first orbit of hydrogen atom

Question # 5

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

Question # 6

The mass of the neutron is of the order of

Question # 7

When 6s orbital is complete then next electron goes to

Question # 8

Which of the following is not charged particle

Question # 9

Subsidiary quantum number specifies

Question # 10

When electrons revolve in stationary orbits

Question # 11

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

Question # 12

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 13

The spectrum of helium is expected to be similar to that of

Question # 14

The range of visible spectrum is

Question # 15

n + l value for 4f will

Question # 16

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

Question # 17

Mass of simple electron is:

Question # 18

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

Question # 19

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 20

Pauli's principle is applicable to

Question # 21

The principle quantum number describes

Question # 22

Quantum number values for 2p orbitals are

Question # 23

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 24

The divisibility of atom was shown by

Question # 25

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

Question # 26

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

Question # 27

Bohr model of atom is contradicted by:

Question # 28

The orbital in Rutherford's model is

Question # 29

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

Question # 30

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
2 Bohr model of atom is contradicted by:
A. Planck's quantum theory
B. Pauli's exclusion theory
C. Heisenberg's uncertainty principle.
D. All of above.
3 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
4 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
5 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< ....
6 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
7 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
8 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
9 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
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
10 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None

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