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

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 2

Charge to mass ratio of electron was discovered by:

Question # 3

Balmer's series is in ______ region

Question # 4

Schrodinger wave equation describes electron completely because

Question # 5

Their e/m, ratio resembles with that of electrons

Question # 6

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

Question # 7

Bohr model of atom is contradicted by:

Question # 8

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

Question # 9

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

Question # 10

The experimental evidences for the existence of atomic nucleus comes from:

Question # 11

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

Question # 12

Quantum number value for 2p orbitals are:

Question # 13

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 14

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 15

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 16

The charge over mass ratio of electron is:

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

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

Question # 19

Which is not true with respect to cathode rays?

Question # 20

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

Question # 21

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

Question # 22

The electronic configuration of an atom/ion can be defined by the following

Question # 23

Charge on electron was discovered by:

Question # 24

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

Question # 25

The maximum number of electrons in a subshell for which l = 3 is

Question # 26

Energy of electron in first orbit of H atom is

Question # 27

Photons of yellow colour are ______ energetic than violet colour

Question # 28

The charge of an electron is determined by

Question # 29

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 30

Quantum number values for 2p orbitals are

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The nature of the positive rays depend on
A. The nature of the electrode
B. The nature of the discharge tube
C. The nature of the residual gas
D. All of the above
2 Charge to mass ratio (e/m) of the electron is determined by
A. R. A. Millikan
B. J. J. Thompson
C. G. J, Stoney
D. None of these
3 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.
4 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
5 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
6 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
7 Azimuthal quantum number of last electron of 11Na is
A. 1
B. 2
C. 3
D. 0
8 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
9 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
10 The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the
A. Orientation of orbital in space
B. Fact that two electrons in the same orbital should have opposite spins
C. Energy of the orbital
D. Spin of the electron

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