H has two natural isotopes of $_1{{\rm{H}}^1}$ and $_1{{\rm{H}}^2}$ and O has two isotopes ${\rm{\;}}\,{O^{16}}$ and ${\rm{\;}}\,{O^{18}}$. Which of the following mol.wt.of ${H_2}O$ will not be possible?

NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM

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H has two natural isotopes of

_1{\mathrm{H}^1}

and

_1{\mathrm{H}^2}

and O has two isotopes

\mathrm{\;}\,{O^{16}}

and

\mathrm{\;}\,{O^{18}}

. Which of the following mol.wt.of

{H_2}O

will not be possible?

View answer and explanation

Correct option: C

Option C (24) is correct because the maximum possible molecular weight of H2O is achieved with the heaviest isotopes of hydrogen and oxygen, which is less than 24.

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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

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{p}

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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?