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

00:00
Question # 1

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

Question # 2

Cathode rays emitted from cathode are

Question # 3

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

Question # 4

The order of distance between the various Bohr orbits is

Question # 5

The orbitals having n + l = 5 are

Question # 6

When 3p orbital is complete, the entering electron goes into

Question # 7

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

Question # 8

The radiations with wavelength shorter than violet light are called

Question # 9

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

Question # 10

The quantum number which describes the shape of the orbital is

Question # 11

A 4f orbital has

Question # 12

Mass of simple electron is:

Question # 13

Orbital having same energy is called:

Question # 14

Quantum number values for 2p orbitals are

Question # 15

The number of spherical nodes in 3p orbitals are

Question # 16

The electron in an atom

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The spectrum of He is expected to be similar to that of

Question # 21

The quantum number which determines the shape of the orbital is

Question # 22

The spectrum of helium is expected to be similar to that of

Question # 23

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 24

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 25

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

Question # 26

The charge of an electron is determined by

Question # 27

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 28

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

Question # 29

Neutrons was discovered by

Question # 30

The energy of ionization of an atom is the energy difference between orbital

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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 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
3 Which of the following is not isoelectronic?
A. Na+
B. Mg2+
C. O2-
D. Cl-
4 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
5 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
6 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
7 Bohr model of atom is contradicted by:
A. Planck's quantum theory
B. Pauli's exclusion theory
C. Heisenberg's uncertainty principle.
D. All of above.
8 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
9 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
10 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C

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