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Standard VII
Chemistry
Sub-Atomic Particles
Which of the ...
Question

Which of the following statements about Rutherford’s model of atom are correct?
(i) Considered that the nucleus was positively charged.
(ii) Established that the α-particles are four times as heavy as a hydrogen atom.
(iii) Can be compared to the solar system. (iv) Was in agreement with Thomson’s model.

A
(i) and (iii)
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B
(ii) and (iii)
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C
(i) and (iv)
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D
only (i)
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Solution

The correct option is A (i) and (iii)
Rutherford discovered the nucleus with the help of his alpha scattering experiment and it could be correlated with the solar system.

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Q.
Which of the following conclusions can be drawn from the Rutherford alpha scattering model?
I. The atom is mostly empty space.
II. Electrons orbit the nucleus of the atom.
III. The atom has a dense, positively charged nucleus.
Q. According to the Rutherford model of the atom, which of the following statement(s) is/are correct regarding an electron revolving around the nucleus of an unielectronic system
Q.
Choose the correct alternative from the clues given at the end of each statement:

a) The size of the atom in the Thomsons model is ........... the atomic size in Rutherford's model.
(much greater than/no different from/much less than.)

b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force.
(Thomsons model/ Rutherfords model.)

c) A classical atom based on .......... is doomed to collapse.
(Thomsons model/ Rutherfords model.)

d) An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in ..........
(Thomsons model/ Rutherfords model.)

e) The positively charged part of the atom possesses most of the mass in ..........
(Rutherfords model / both the models.)
Q. Question 7
In the Thomson's model of an atom, which of the following statements are correct?
(i) The mass of the atom is assumed to be uniformly distributed over the atom.
(ii) The positive charge is assumed to be uniformly distributed over the atom.
(iii) The electrons are uniformly distributed in the positively charged sphere.
(iv) The electrons attract each other to stabilise the atom.

(a) (i), (ii) and (iii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (iii) and (iv)
Q. Question 8
Rutherford's a-particle scattering experiment showed that

(i) electrons have negative charge.
(ii) the mass and positive charge of the atom is concentrated in the nucleus.
(iii) neutron exists in the nucleus.
(iv) most of the space in atom is empty.
Which of the above statements are correct?

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)
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