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

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

Question # 2

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 # 3

In the ground state of an atom the electron is present

Question # 4

E = hv is the

Question # 5

The configuration 1s22s22p53s1shows

Question # 6

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

Question # 7

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

Question # 8

When potassium metal is exposed to violet light

Question # 9

The credit of discovering neutron goes to

Question # 10

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

Question # 11

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 12

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

Question # 13

Rutherford's model of atom failed because:

Question # 14

The nature of positive ray depend on:

Question # 15

Charge on electron was discovered by:

Question # 16

When 6s orbital is complete then next electron goes to

Question # 17

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

Question # 18

The total number of orbitals possible for the quantum number n is

Question # 19

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 20

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

Question # 21

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

Question # 22

The number of neutrons in the element 94Be is

Question # 23

When electrons revolve in stationary orbits

Question # 24

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

Question # 25

The radius of first orbit of H-atom is

Question # 26

Subsidiary quantum number specifies

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

Smallest charge of electricity that has been measured so far is

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Sr.# Question Answer
1 The electronic configuration of an atom/ion can be defined by the following
A. Aufbau principle
B. Pauli's exclusion principle
C. Hund's Rule
D. All the above
2 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
3 Cathode rays emitted from cathode are
A. Canal rays
B. Protons
C. Electrons
D. Positrons
4 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
5 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
A. low ionization energy of sodium
B. sublimation of metallic sodium to give yellow vapour
C. emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
D. photosenitivity
6 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
7 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2
8 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
9 The electron in an atom
A. moves randomly around the nucleus
B. has fixed space around the nucleus
C. is stationary in various energy levels
D. moves around its nucleus in definite energy levels
10 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
A. 0, 1, 2, 3
B. +3, +2, +1, -1, -2, -3
C. 0, -1, -2 ,-3
D. -3, 0, +3
11 The number of neutrons in the element 94Be is
A. 4
B. 5
C. 9
D. 13
12 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
13 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
14 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher
15 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
16 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2
17 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
18 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< ....
19 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
20 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
21 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
22 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
23 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy
24 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
25 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
26 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
27 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays
28 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
29 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
30 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.

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