NCERT Class-9 Science Solutions: Chapter 4-Structure Of The Atom Part 1
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Multiple Choice Questions
Question 1:
Which of the following correctly represent the electronic distribution in the atom?
Answer: B

Image of Electronic Distribution in the Mg Atom
Image of electronic distribution in the Mg atom
Question 2:
Rutherford’s ‘alpha particles scattering experiment’ resulted in to discovery of
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Electron
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Proton
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Nucleus in the atom
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Atomic mass
Answer: C
Question 3:
The number of electrons in an element and the number of neutrons is 16. Which of the following is the correct representation of the element?
Answer: A
Question 4:
Dalton’s atomic theory successfully explained
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Law of conservation of mass
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Law of constant composition
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Law of radioactivity
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Law of multiple proportion
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(i), (ii) and (iii)
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(i), (iii) and (iv)
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(ii), (iii) and (iv)
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(i), (ii) and (iv)
Answer: D

Image of Dalton's Atomic Theory
Image of Dalton's Atomic Theory
Question 5:
Which of the following statements about Rutherford’s model of atom are correct?
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Considered the nucleus as positively charged
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Established that the α–particles are four times as heavy as a hydrogen atom
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Can be compared to solar system
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Was in agreement with Thomson’s model
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(i) and (iii)
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(ii) and (iii)
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(i) and (iv)
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only (i)
Answer: A
Question 6:
Which of the following are true for an element?
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-
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-
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(i) and (ii)
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(i) and (iii)
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(ii) and (iii)
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(ii) and (iv)
Answer: D