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

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

Question # 2

A 4f orbital has

Question # 3

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

Question # 4

The charge over mass ratio of electron is:

Question # 5

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 6

When 6s orbital is complete then next electron goes to

Question # 7

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

Question # 8

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

Question # 9

The size of electronic shell is described by

Question # 10

Alpha rays consist of:

Question # 11

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

Question # 12

Quantum number values for 2p orbitals are

Question # 13

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

Question # 14

The nature of the positive rays depend on

Question # 15

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 16

The mass of the neutron is of the order of

Question # 17

The value of charge on electron is

Question # 18

Spectrum of white light is continuous becuase

Question # 19

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 20

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

Question # 21

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

Question # 22

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 23

The orbital in Rutherford's model is

Question # 24

Which of the following is not a property of cathode rays

Question # 25

Neutron was discovered by:

Question # 26

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 27

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

Question # 28

Cathode rays emitted from cathode are

Question # 29

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

Question # 30

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Smallest charge of electricity that has been measured so far is
A. Charge on a-rays
B. Charge on electron (1.602 x 10-19C)
C. Charge on x-rays
D. Charge on gamma rays
2 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
3 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
4 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
5 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
6 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
7 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
8 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
9 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
10 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

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