Question # 1

The radius of first orbit of hydrogen atom

Choose an answer

0.329 A°

0.429 A°

0.529 A°

0.229 A°

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

Choose an answer

Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

Which is not true with respect to cathode rays?

Choose an answer

A stream of electrons

Charged particles

Move with speed as that of light

Can be deflected by magnetic fields

Which one of the following statements is true about discovery of neutrons?

Choose an answer

These particles were formed by the bombardment of Alpha-particles on Beryllium.

These particles are formed by the spiting of alpha-particles.

These particles were discovered by natural radioactivity.

None of above.

The mass of the neutron is of the order of

Choose an answer

10^-23kg

10^-24kg

10^-26kg

10^-27kg

Which of the following is not a sub-atomic particle

Choose an answer

Electron

Proton

Neutron

Deuteron

Mass of simple electron is:

Choose an answer

9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

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

Choose an answer

50%

Less than 10%.

More than 95%.

Zero.

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

Choose an answer

Aufbau principle

Pauli's exclusion principle

Hund's Rule

All the above

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

Choose an answer

1 : 1

1 : 3

1 : 9

1 : 16

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Choose an answer

Cathode rays travel in straight lines

Cathode rays are negatively charged

Cathode rays produce x-rays

Cathode rays are material particles having momentum

Heaviest particle is

Choose an answer

Meson

Neutron

Proton

Electron

When electrons revolve in stationary orbits

Choose an answer

There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

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

Choose an answer

2,1,0

2,1,1

3,1,1

3,2,1

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

Choose an answer

Paschen

Pfund

Balmer

Brackett

Choose an answer

s

p

d

f

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

Choose an answer

12 and 4

16 and 5

16 and 4

12 and 5

More Classes

Other Links

ECAT Chemistry Chapter 5 Atomic Structure Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer