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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Hard

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Application +4 | -1

From

\mathrm{n}^{\text {th }}

shell electron comes back to lymen series of hydrogen atom. If wavelength of hydrogen spectrum is same as wavelength for

\mathrm{n}=4

to

\mathrm{n}=2

transition of

\mathrm{He}^{+}

spectrum. What is the value of

\mathrm{n}

for hydrogen atom.

View answer and explanation

Correct option: A

2

The correct answer is A (2) because the wavelength for the Lyman series transition in hydrogen must match the given transition in He+.

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Which of the following pairs have identical values of e/m? The correct de Broglie relationship is: Assertion: Unlike sound waves, electromagnetic waves do not require medium and can move in vacuum.

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{p}_{{x}}

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n

{p}

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n

' increases. S-I: Elements like

Rb, Cs, Tl, In, Ga

Sc

were discovered when their minerals were analysed by spectroscopic methods.

S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?