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

Pauli's principle is applicable to

Question # 2

The nature of positive rays depend on:

Question # 3

Rutherford's model of atom failed because:

Question # 4

Which of the following is not charged particle

Question # 5

The size of electronic shell is described by

Question # 6

Which of the following has more unpaired d-electrons?

Question # 7

Which is not true with respect to cathode rays?

Question # 8

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

Question # 9

The velocity of photon is:

Question # 10

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 11

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

Question # 12

Neutron was discovered by:

Question # 13

Neutrons was discovered by

Question # 14

What is the packet of energy called?

Question # 15

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 16

The range of visible spectrum is

Question # 17

Schrodinger wave equation describes electron completely because

Question # 18

The orbital in Rutherford's model is

Question # 19

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

Question # 20

The number of electrons in the M shell of the element with atomic number 24 is

Question # 21

The mass of the neutron is of the order of

Question # 22

Effective magnetic moment of Sc3+ion is

Question # 23

Rutherford's atomic model suggests the existence of

Question # 24

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

Question # 25

When potassium metal is exposed to violet light

Question # 26

In the ground state of an atom the electron is present

Question # 27

The radiations with wavelength shorter than violet light are called

Question # 28

Charge of an electron is:

Question # 29

The orbitals having n + l = 5 are

Question # 30

Which have better penetrating power

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
2 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
3 Light emitted from a source has its wave length 500nm, then its wave number will be
A. 2 x 106m-1
B. 2 x 107m-1
C. 5 x 108 m-1
D. 5 x 109m-1
4 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
5 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
6 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
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
7 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
8 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
9 The radius of first orbit of H-atom is
A. 4.75 A°
B. 3.84 A°
C. 8.4 A°
D. 0.529 A°
10 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.

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