E_n= -1311.8 KJ mol^-1. If the value of E is -82 KJ mol^-1 , to which value "n" corresponds?

1. 2
2. 3
3. 4
4. 5
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Answer: C
Explanation:
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Which of the following species has the same electronic configuration as that of argon atom?

1. O^-2
2. K⁺
3. Mg⁺²
4. Na
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Answer: B
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The maximum number of electrons that can be accomodated in an orbit is;

1. 2n
2. 2n²
3. n²
4. 2n+1
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Answer: B
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Which one is not isoelectronic with rest of the followings?

1. Cl^-
2. K⁺
3. Al⁺³
4. Ca+2
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Answer: C
Explanation:
• Al⁺³ has 10 electrons while others have 18 electrons each
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The diameter of nucleus is of the order of:

1. 10^-13 cm
2. 10^-10 cm
3. 10^-8 cm
4. 10^-15 cm
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Answer: A
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The diameter of an atom is of the order of:

1. 10^-13 cm
2. 10^-10 cm
3. 10^-8 cm
4. 10^-15 cm
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Answer: C
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Which is not the unit of wavelength?

1. Å
2. cm^-1
3. nm
4. µm
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Answer: B
Explanation:
• cm^-1 is the unit of wavenumber
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Which is not the unit of wavenumber?

1. cm^-1
2. mm^-1
3. m^-1
4. nm
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Answer: D
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The wavelength of a violet light is 400 nm, its wavenumber is:

1. 25 x 10⁵ m^-1
2. 7.5 x 10¹⁴ m^-1
3. 4 x 10^-9 m
4. 0.025 nm
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Answer: A
Explanation:
• wavenumber = 1/λ = 1/400 nm = 25 x 10⁺⁵ m^-1
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The wave number of light emitted by a certain source is 2 x 10⁶m, its wavelength is:

1. 500 m
2. 500 nm
3. 200 nm
4. 5 x 10⁷ m
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Answer: B
Explanation:
• λ = 1 / wavenumber
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