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

Heaviest particle is

Question # 2

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

Question # 3

The number of spherical nodes in 3p orbitals are

Question # 4

The value of charge on electron is

Question # 5

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

Question # 6

The value of R (Rydberg's constant) is _______ m-1

Question # 7

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 8

1 erg of energy corresponds to

Question # 9

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

Question # 10

The velocity of photon is:

Question # 11

Anode is the surface on which probability of finding electron is:

Question # 12

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 13

E = hv is the

Question # 14

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

Question # 15

The size of electronic shell is described by

Question # 16

The divisibility of atom was shown by

Question # 17

In the ground state of an atom the electron is present

Question # 18

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

Question # 19

Orbital having same energy is called:

Question # 20

The charge of an electron is determined by

Question # 21

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 22

The value of Plank's constant 'h' is

Question # 23

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

Question # 24

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

Question # 25

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 26

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

Question # 27

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?

Question # 28

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

Question # 29

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 30

Which of the following orbitals have a dumb bell shape?

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
3 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
4 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
5 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
6 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
7 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
8 If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be
A. 3 x ao
B. 6 x ao
C. 9 x ao
D. 1/2 x ao
9 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
10 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays

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