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

Question # 2

The credit of discovering neutron goes to

Question # 3

Which of the following is not a property of cathode rays

Question # 4

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 5

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

Question # 6

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

Question # 7

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 8

In the ground state of an atom the electron is present

Question # 9

The energy of the first electron is helium will be

Question # 10

The four quantum numbers of the valency electron of potassium are

Question # 11

Number of neutrons in heavy hydrogen atom is

Question # 12

The quantum number which determines the shape of the orbital is

Question # 13

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

Question # 14

The mass of the neutron is of the order of

Question # 15

Bohr model of atom is contradicted by:

Question # 16

Which of the following was discovered first:

Question # 17

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 18

The e.m value for positive rays maximum for:

Question # 19

The charge over mass ratio of electron is:

Question # 20

Heaviest particle is

Question # 21

The configuration 1s22s22p53s1shows

Question # 22

The number of spherical nodes in 3p orbitals are

Question # 23

The radiations with wavelength shorter than violet light are called

Question # 24

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 25

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 # 26

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

Question # 27

Which of the following is not a sub-atomic particle

Question # 28

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 29

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

Question # 30

The radius of second Bohr's orbit is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which of the following is not isoelectronic?
A. Na+
B. Mg2+
C. O2-
D. Cl-
2 The valence orbital configuration of an element with atomic number 23 is
A. 3d5
B. 3d3, 4s2
C. 3d3, 4s1, 4p1
D. 3d2,4s2,4p1
3 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
4 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
5 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
6

Mass of simple electron is:
A.

9.1 x 10-31 kg

B.

9.1 x 10-30 kg

C.

1.66 x 10-31 kg

D.

9.1 x 10-31 kg
7 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
8 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
9 The value of R (Rydberg's constant) is _______ m-1
A. 1.0974 x 107
B. 1.0842 x 107
C. 1.082 x 10-7
D. Both a and b
10 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

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