NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Hard

1 of 1

Analyzing +4 | -1

\mathrm{He}^{+}

ions in its ground state are irradiated with photons of energy

67.15 \mathrm{~eV}

. Electrons ejected from

\mathrm{He}^{+}

strikes the

\mathrm{H}

-atom in its ground state. Give the maximum number of spectral lines which can be obtained from de-excitation of

\mathrm{H}

-atoms.

View answer and explanation

Correct option: A

Option A (6) is correct because the electrons ejected from He+ excite the H-atom to n=4, and the number of spectral lines is calculated using the formula n(n-1)/2.

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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.

Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The

{p}_{{x}}

orbital has maximum electron density along the y axis and its nodal plane is xz plane.

S-II : For a given atom, for all values of

n

, the

{p}

-orbitals have the same shape, but the overall size decreases as '

n

' increases. S-I: Elements like

Rb, Cs, Tl, In, Ga

and

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?