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

Orbitals having same energy are called

Question # 2

The nature of positive rays depend on:

Question # 3

Subsidiary quantum number specifies

Question # 4

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

Question # 5

The range of visible spectrum is

Question # 6

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

Question # 7

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

Question # 8

The mass of the neutron is of the order of

Question # 9

Which of the following is not a property of cathode rays

Question # 10

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

Question # 11

The maximum number of electrons in a subshell for which l = 3 is

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

The nature of the positive rays depend on

Question # 18

Their e/m, ratio resembles with that of electrons

Question # 19

Alpha rays consist of:

Question # 20

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 21

Charge on electron was discovered by:

Question # 22

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

Question # 23

Which of the following is not isoelectronic?

Question # 24

n + l value for 4f will

Question # 25

The degenerate orbitals p-sub shell are

Question # 26

The number of neutrons in the element 94Be is

Question # 27

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

Question # 28

Which is not true with respect to cathode rays?

Question # 29

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

Question # 30

Which of the following was discovered first:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
2 The number of electrons in the M shell of the element with atomic number 24 is
A. 24
B. 12
C. 13
D. 8
3 Which is not true with respect to cathode rays?
A. A stream of electrons
B. Charged particles
C. Move with speed as that of light
D. Can be deflected by magnetic fields
4 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
5 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.
6 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
7 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
8 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
9 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
10 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?
A. 6
B. 11
C. 17
D. 23

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