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

What is the packet of energy called?

Question # 2

Pauli's principle is applicable to

Question # 3

Proton was discovered by:

Question # 4

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 5

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 6

Which is not true with respect to cathode rays?

Question # 7

Which of the following is not a property of cathode rays

Question # 8

Which of the following has more unpaired d-electrons?

Question # 9

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

Question # 10

Alpha rays consist of:

Question # 11

The e.m value for positive rays maximum for:

Question # 12

Which of the following orbitals have a dumb bell shape?

Question # 13

Smallest charge of electricity that has been measured so far is

Question # 14

Number of neutrons in heavy hydrogen atom is

Question # 15

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 16

Charge on electron was discovered by:

Question # 17

The orbitals having n + l = 5 are

Question # 18

Energy of electron in first orbit of H atom is

Question # 19

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

Question # 20

Which of the following is not charged particle

Question # 21

The quantum number which describe the orientation of the orbitals is

Question # 22

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 # 23

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

Question # 24

The order of distance between the various Bohr orbits is

Question # 25

The size of electronic shell is described by

Question # 26

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

Question # 27

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 28

The value of Plank's constant 'h' is

Question # 29

The radius of first orbit of H-atom is

Question # 30

The configuration 1s22s22p53s1shows

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
3 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
4 When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series
5 The wave length of electron as wave is 0.5 nm. What is the wave length in meter
A. 5 x 10-9
B. 5 x 10-12
C. 5 x 10-6
D. 5 x 10-10
6 Energy of electron in the infinite Bohr orbit of H-atom is
A. 0 KJ/mole
B. 1 KJ/mole
C. -1 KJ/mole
D. -1313.32 KJ/mole
7 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
8 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
9 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton
10 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N

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