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

Charge to mass ratio (e/m) of the electron is determined by

Question # 2

Rutherford's planetary like picture of the atomic modal was defective because

Question # 3

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 4

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

Question # 5

Which of the following was discovered first:

Question # 6

Which of the following is not isoelectronic?

Question # 7

Which is not true with respect to cathode rays?

Question # 8

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

Question # 9

Balmer's series is in ______ region

Question # 10

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

Question # 11

The radius of first orbit of hydrogen atom

Question # 12

The energy of the first electron is helium will be

Question # 13

The charge over mass ratio of electron is:

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Schrodinger wave equation describes electron completely because

Question # 22

The orbital in Rutherford's model is

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

When electrons revolve in stationary orbits

Question # 28

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

Question # 29

Proton was discovered by:

Question # 30

Azimuthal quantum number of last electron of 11Na is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The radius of second Bohr's orbit is
A. 0.053 nm
B. 0.053/4 nm
C. 0.053 x 4 nm
D. 0.053 x 20 nm
2 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
3 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
4 Which is not true with respect to cathode rays?
A. A stream of electrons
B. Charged particles
C. Move with speed as that of light
D. Can be deflected by magnetic fields
5 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
6 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25
A. 3.0 BM
B. 4.9 BM
C. 5.9 BM
D. 6.9 BM
7 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
8 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
9 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
10 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

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