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JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Assertion: Oxygen has less negative electron gain enthalpy than sulphur.

Reason: Oxygen is more electronegative than sulphur.

View answer and explanation

Correct option: B

Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.

The correct answer is B (Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.) because both statements are true, but electronegativity doesn't directly explain the electron gain enthalpy difference.

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The gas used for inflating the tyres of aeroplanes is: Which of the following is correct stability order of oxides of

17^{\text {th }}

group elements is: Assertion: Ozone is a powerful oxidising agent in comparison to

{O}_2

.

Reason: Ozone is diamagnetic but

{O}_2

is paramagnetic. Which of the following is kept in water?

\mathrm{C}{\mathrm{N}^ - }

{\mathrm{N}_2}

are isoelectronic but in contrast to

\mathrm{C}{\mathrm{N}^ - },\mathrm{\;}{\mathrm{N}_2}

is chemically inert because of: Consider the following statements

(i) Reaction

2 {Fe}^{3+}+{SO}_2+2 {H}_2 {O} \rightarrow 2 {Fe}^{2+}+{SO}_4^{2-}+4 {H}^{+}

shows reducing character of sulphur dioxide

(ii)

{H}_2 {~S}_2 {O}_8

{S}={O}

{S}-{OH}

{O}-

{O}

{NH}_3

gas can be dried effectively by using conc.

{H}_2 {SO}_4

.

(iv) One of the major use of

{H}_2 {SO}_4

is in the manufacture of fertilizers.

Which of the following is the correct code for the statements above?