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 four quantum numbers of the valency electron of potassium are

Question # 2

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

Question # 3

Which of the following is not a sub-atomic particle

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Which of the following was discovered first:

Question # 8

Rutherford's experiment led to the discovery of

Question # 9

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

Question # 10

The divisibility of atom was shown by

Question # 11

Quantum number value for 2p orbitals are:

Question # 12

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 13

The nature of positive ray depend on:

Question # 14

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

Question # 15

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

Question # 16

The orbital in Rutherford's model is

Question # 17

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

Question # 18

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

Question # 19

Rutherford's model of atom failed because:

Question # 20

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

Question # 21

Energy of electron in first orbit of H atom is

Question # 22

Orbitals having same energy are called

Question # 23

The degenerate orbitals p-sub shell are

Question # 24

The radiations with wavelength shorter than violet light are called

Question # 25

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 26

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

Question # 27

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 28

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 29

E = hv is the

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
2 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
3 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
4 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
5 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
6 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
7 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.
8 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
9 The experimental evidences for the existence of atomic nucleus comes from:
A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.
10 Rutherford's experiment led to the discovery of
A. Nucleus
B. Electron
C. Proton
D. alpha particle

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