ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

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 electron in an atom

Question # 2

The valence orbital configuration of an element with atomic number 23 is

Question # 3

When 6d orbital is complete, the entering electron goes into:

Question # 4

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

Question # 5

Rutherford's atomic model suggests the existence of

Question # 6

Quantum number values for 2p orbitals are

Question # 7

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

Question # 8

Which of the following is not a sub-atomic particle

Question # 9

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 10

The radiations with wavelength shorter than violet light are called

Question # 11

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

Question # 12

When electrons revolve in stationary orbits

Question # 13

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 14

The divisibility of atom was shown by

Question # 15

Subsidiary quantum number specifies

Question # 16

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

Question # 17

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

Question # 18

The nature of the positive rays depend on

Question # 19

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 20

The uncertainty principle was stated only

Question # 21

Maximum potential energy that an electron can have within the atom is:

Question # 22

Heaviest particle is

Question # 23

The quantum number which determines the shape of the orbital is

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 29

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 30

Which of the following particles has longest wavelength, if they have same speed:

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Sr.# Question Answer
1 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.
2 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
3 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
4 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
5 The velocity of photon is:
A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.
6 The nature of positive ray depend on:
A. The nature of electrode.
B. The nature of discharge tube.
C. The nature of residual gas.
D. All of above.
7
Question Image
A. s
B. p
C. d
D. f
8 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
9 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
10 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
11 Energy of electron in an orbit according to Bohr theory is negative due to
A. Repulsion of electrons in the same orb
B. At infinity energy is zero ad a traction towards nucleus decreases energy
C. Electron has negative charge
D. Product of positive nuclear charge and negative charge is negative
12 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
13 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
14 The quantum number which determines the shape of the orbital is
A. principal
B. azimuthal
C. magnetic
D. spin
15 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4
16 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
17 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
18 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
19 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
20 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.
21 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
22 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
23 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
24 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
25 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
26 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
27 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
28 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
29 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
30

Mass of simple electron is:
A.

9.1 x 10-31 kg

B.

9.1 x 10-30 kg

C.

1.66 x 10-31 kg

D.

9.1 x 10-31 kg

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