NDA CHEMISTRY QUIZ - 12

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Question 1:

Rutherford used zinc sulphide coating on the circular screen because-

Question 2:

Size of nucleus is very small as compared to the size of an atom is concluded by which of the following observations?

Question 3:

Some of the α-particles were deflected by the foil by small angles is the one of the observation made by Rutherford. State what Rutherford concluded about the structure of the gold atom from the given observation?

Question 4:

What was the drawback of Rutherford model of an atom?

  1. Rutherford did not specify the number of orbits 
  2. Rutherford did not specify the number of electrons in each orbit
  3. He was failed to explain the stability of an atom
  4. He state that all the mass of an atom is concentrated in the nucleus of an atom

Question 5:

Rutherford uses alpha particles to study the structure of an atom. Alpha particles are 

  1. A helium nucleus
  2. A doubly ionized helium atom
  3. Two protons and two neutrons (joined)
  4. A helium atom with no electrons

Question 6:

Rutherford kept his model in vacuum 

Question 7:

Match columns I and II 

S.NO

COLUMN I

S.NO

COLUMN II 

A. 

Most of the fast-moving α-particles passed straight through the gold foil. 

1

A very small fraction of α-particles were deflected by 1800 , indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom

B. 

Some of the α-particles were deflected by the foil by small angles. 

2

 Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space. 

C

Surprisingly one out of every 12000 particles appeared to rebound.

3

Most of the space inside the atom is empty because most of the α-particles passed through the gold foil without getting deflected.

Question 8:

Which one of the following conclusion could not be derived from Rutherford's alpha particle scattering experiment ?

Question 9:

In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the alpha-particles were found to deflect at angles > 50°. If one mole of a-particles were bombarded on the gold foil, compute the number of alpha-particles that would deflect at angles less than 50°. 

Question 10:

A very few alpha particles bounced back by 1800. This conclude that

  1. The nucleus is very small
  2. Nucleus is positively charged
  3. Electrons are revolving around nucleus of an atom
  4. Alpha particles are negatively charged