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 nature of positive ray depend on:

Question # 2

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 3

Which have better penetrating power

Question # 4

The mass of the neutron is of the order of

Question # 5

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

Question # 6

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 7

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 8

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 # 9

Rutherford's experiment led to the discovery of

Question # 10

Rutherford's model of atom failed because:

Question # 11

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 12

Quantum number value for 2p orbitals are:

Question # 13

The e.m value for positive rays maximum for:

Question # 14

The orbitals having n + l = 5 are

Question # 15

When electrons revolve in stationary orbits

Question # 16

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

Question # 17

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 18

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 19

Alpha rays consist of:

Question # 20

The configuration 1s22s22p53s1shows

Question # 21

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

Question # 22

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

Question # 23

The number of neutrons in the element 94Be is

Question # 24

Which one of the following statements is true about discovery of neutrons?

Question # 25

Which of the following has more unpaired d-electrons?

Question # 26

The velocity of photon is:

Question # 27

Rutherford's planetary like picture of the atomic modal was defective because

Question # 28

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

Question # 29

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 # 30

The order of distance between the various Bohr orbits is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series
2 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
3 In the ground state of an atom the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
4 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.
5 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be
A. 1
B. 4
C. 9
D. 12
6 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
7 Splitting of spectral lines when atoms are subjected to strong electric field is called:
A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.
8 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit
9 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
10 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.

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