Online Chemistry MCQs Quiz Unit-2: Structure of Atoms

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SSC-1 (Class-9) Chemistry (National Book Foundation as Federal Text Board Islamabad)

(i) According to Bohr atomic model:

10 points

(a) Each orbit has fixed energy, so each orbit is called sub-energy level.

(b) The energy of the electron is inversely proportional to its distance from the nucleus.

(d) The further the electron is from the nucleus, the more energy it has.

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(ii) Chlorine has two isotopes, both of which have

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(a) same mass number.

(b) same number of neutrons.

(d) same number of electrons.

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(iii) Number of neutrons in ²⁷M₁₃ are

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(a) 13

(b) 14

(d) 15

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(iv) Which isotope is commonly used to irradiate cancer cells?

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(a) lodine-123

(b) Carbon-14

(d) lodine-131

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(v) M shell has sub-shells:

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(a) 1s, 2

(b) 2s, 2p

(d) 1s, 2s, 3s

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(vi) A sub-shell that can accommodate 6 electrons is

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(a) s

(b) d

(d) f

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(vii) Na has electronic configuration:

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(a) 1s² 2s² 3s¹

(b) 1s² 2s² 2p⁷

(d) 1s² 2s² 2p⁶ 3s¹

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(viii) Rutherford used particles in his experiments.

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(a) He atoms

(b) He⁺

(d) He⁻²

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(ix) Which of the following statement is not correct about isotopes?

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(a) they have same atomic number

(b) they have same number of protons

(d) they have same physical properties

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(x) Which isotope is used in nuclear reactors?

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(a) U-234

(b) U-238

(d) All of these

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