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

The energy of the first electron is helium will be

Question # 2

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

Question # 3

The orbitals having n + l = 5 are

Question # 4

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

Question # 5

What is the packet of energy called?

Question # 6

The nature of positive rays depend on:

Question # 7

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

Question # 8

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 9

When 6d orbital is complete, the entering electron goes into:

Question # 10

Which of the following has more unpaired d-electrons?

Question # 11

The configuration 1s22s22p53s1shows

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Rutherford's model of atom failed because:

Question # 17

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

Question # 18

E = hv is the

Question # 19

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

Question # 20

Bohr model of atom is contradicted by:

Question # 21

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 22

The nature of positive ray depend on:

Question # 23

Effective magnetic moment of Sc3+ion is

Question # 24

The velocity of photon is:

Question # 25

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 26

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

Question # 27

The uncertainty principle was stated only

Question # 28

Schrodinger wave equation describes electron completely because

Question # 29

Neutrons was discovered by

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 Cathode rays emitted from cathode are
A. Canal rays
B. Protons
C. Electrons
D. Positrons
3 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
4 The value of Plank's constant 'h' is
A. 6.625 x 10-34
B. 6.625 x 10-34J sec
C. 6.625 x 10-34KJ
D. 6.625 x 10-34K Cal
5 In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits
A. Increases
B. Decreases
C. Reaming same
D. Orbits coincide
6 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
7 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
8 The energy of ionization of an atom is the energy difference between orbital
9 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
10 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton

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