NEET UG 2005 — Chemistry Inorganic Chemistry

2005mcqeasy

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

Official previous-year question

Held on 30 Apr 2005 · Verified 9 Jul 2026.

Options

A
S $<$ O $<$ Cl $<$ F
B
$\mathrm{Cl} <$ F $<$ S $<$ O
C
F $<$ Cl $< \mathrm{O} < \mathrm{S}$
D
$\mathrm{O} < \mathrm{S} < \mathrm{F} < \mathrm{Cl}$

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Solution

The electron gain enthalpy of elements increases along a period towards right and decreases down the group. However, the $\mathrm{EA}$ of $\mathrm{Cl}$ is higher than that of $F$ and EA of $S$ is higher than that of $\mathrm{O}$ as $\mathrm{F}$ and $\mathrm{O}$ are very small in size. Thus, the correct order of EA is: $\mathrm{O} < \mathrm{S} < \mathrm{F} < \mathrm{Cl}$ Caution Oxygen molecule has a less negative electron gain enthalpy than sulphur. This is on the grounds that Oxygen, because of its compressed nature encounter more repulsion between the electrons effectively present and the approaching electron.

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NEET UG 2005 — Chemistry Inorganic Chemistry

2005mcqeasy

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

Official previous-year question

Held on 30 Apr 2005 · Verified 9 Jul 2026.

Options

A
S $<$ O $<$ Cl $<$ F
B
$\mathrm{Cl} <$ F $<$ S $<$ O
C
F $<$ Cl $< \mathrm{O} < \mathrm{S}$
D
$\mathrm{O} < \mathrm{S} < \mathrm{F} < \mathrm{Cl}$

Did you get this right?

Solution

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NEET UG Inorganic Chemistry in other years

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NEET UG 2005 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

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NEET UG Inorganic Chemistry in other years

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Physical Chemistry

Organic Chemistry

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NEET UG 2005 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

NEET UG Inorganic Chemistry in other years

More NEET UG Inorganic Chemistry questions

Other Chemistry topics for NEET UG

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry