ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

Question # 1

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

0, 1, 2, 3 A
+3, +2, +1, -1, -2, -3 B
0, -1, -2 ,-3 C
-3, 0, +3 D

Question # 2

The radius of first orbit of H-atom is

4.75 A° A
3.84 A° B
8.4 A° C
0.529 A° D

Question # 3

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

1 A
4 B
9 C
12 D

Question # 4

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

1.0974 x 107 A
1.0842 x 107 B
1.082 x 10-7 C
Both a and b D

Question # 5

E = hv is the

Spectral equation A
Plank's equation B
de Broglie's equation C
None of these D

Question # 6

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

Cathode rays are material particles A
Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place B
Cathode rays are absorbed by the nucleus C
Cathode rays become heated D

Question # 7

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

50% A
Less than 10%. B
More than 95%. C
Zero. D

Question # 8

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

5s A
5p B
5d C
5f D

Question # 9

Rutherford's atomic model suggests the existence of

Atom A
Nucleus B
alpha particle C
Measons D

Question # 10

The number of neutrons in the element ⁹₄Be is

4 A
5 B
9 C
13 D

Question # 11

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

Aufbau principle A
Pauli's exclusion principle B
Hund's Rule C
All the above D

Question # 12

The configuration 1s²2s²2p⁵3s¹shows

Excited state of O₂ A
Excited state of neon B
Excited state of fluorine C
Ground state of fluorine atom D

Question # 13

Subsidiary quantum number specifies

size of orbital A
shape of orbital B
orientations of orbitals C
Nuclear stability D

Question # 14

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

Copper A
Chromium B
Nickel C
Iron D

Question # 15

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

As,Sb A
Ge,Sn B
In,pt C
Se,Te D

Question # 16

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

Voltage is low A
Discharge tube is not coloured B
Gas does not conduct current under ordinary pressure C
Temperature low D

Question # 17

The radius of first orbit of hydrogen atom

0.329 A° A
0.429 A° B
0.529 A° C
0.229 A° D

Question # 18

The four quantum numbers of the valency electron of potassium are

4,1,1,1/2 A
4,0,0,1/2 B
4,1,0,1/2 C
4,4,0,1/2 D

Question # 19

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Increases A
Decreases B
Reaming same C
Orbits coincide D

Question # 20

The quantum number which describe the orientation of the orbitals is

Spin quantum number A
Principle quantum number B
Azimathal quantum number C
Magnetic quantum number D

Question # 21

An orbital can accommodate maximum two electrons with opposite spins according to

Heisenberg's principle A
Aufbau principle B
Hund's srule C
Pauli exclusion principle D

Question # 22

Which of the following is not charged particle

Proton A
Electron B
Neutron C
Hydrogen nucleus D

Question # 23

When potassium metal is exposed to violet light

Ejection of electrons takes place A
Ejection of some potassium atoms occurs B
There is no effect C
The absorption of electrons takes place D

Question # 24

Which of the atoms has 1s², 2s², 2p_x²2p¹_y2p¹_zconfiguration

Nitrogen A
Carbon B
Fluorine C
Oxygen D

Question # 25

Their e/m, ratio resembles with that of electrons

Alpha rays A
Beta rays B
Gamma rays C
X-rays D

Question # 26

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

In the nucleus A
In the second shell B
Nearest to the nucleus C
Farthest from the nucleus D

Question # 27

Smallest charge of electricity that has been measured so far is

Charge on a-rays A
Charge on electron (1.602 x 10^-19C) B
Charge on x-rays C
Charge on gamma rays D

Question # 28

Which of the following is not a property of cathode rays

They can produce x-rays when they strike a heavy metal anode A
They can cause reduction reaction B
They produce fluorescence in rare earth and minerals C
They comprise neutral particles D

Question # 29

Photons of yellow colour are ______ energetic than violet colour

More A
Less B
Equal C
None D

Question # 30

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

low ionization energy of sodium A
sublimation of metallic sodium to give yellow vapour B
emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region C
photosenitivity D

Sr.#	Question	Answer
1	The e.m value for positive rays maximum for:	A. Oxygen. B. Nitrogen. C. Helium. D. Hydrogen.
2	The quantum number which determines the shape of the orbital is	A. principal B. azimuthal C. magnetic D. spin
3	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
4	Number of neutrons in heavy hydrogen atom is	A. 0 B. 1 C. 2 D. 3
5	In which of the following pairs, the numbers of electrons in the outermost shell are different?	A. As,Sb B. Ge,Sn C. In,pt D. Se,Te
6	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
7	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
8	The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is	A. N B. Li C. P D. Na
9	Light emitted from a source has its wave length 500nm, then its wave number will be	A. 2 x 10⁶m^-1 B. 2 x 10⁷m^-1 C. 5 x 10⁸m^-1 D. 5 x 10⁹m^-1
10	Charge to mass ratio of electron was discovered by:	A. Millika. B. Rutherford. C. J.J. Thomson. D. Chadwick.

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ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

ECAT Chemistry Chapter 5 Atomic Structure

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

The radius of first orbit of H-atom is

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

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

E = hv is the

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

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

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

Rutherford's atomic model suggests the existence of

The number of neutrons in the element 94Be is

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

The configuration 1s22s22p53s1shows

Subsidiary quantum number specifies

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

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

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

The radius of first orbit of hydrogen atom

The four quantum numbers of the valency electron of potassium are

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

The quantum number which describe the orientation of the orbitals is

An orbital can accommodate maximum two electrons with opposite spins according to

Which of the following is not charged particle

When potassium metal is exposed to violet light

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

Their e/m, ratio resembles with that of electrons

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

Smallest charge of electricity that has been measured so far is

Which of the following is not a property of cathode rays

Photons of yellow colour are ______ energetic than violet colour

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

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The number of neutrons in the element ⁹₄Be is

The configuration 1s²2s²2p⁵3s¹shows

Which of the atoms has 1s², 2s², 2p_x²2p¹_y2p¹_zconfiguration