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JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Analyzing +4 | -1

Statement I: Single

\mathrm{N}-\mathrm{N}

bond is weaker than the single

\mathrm{P}-\mathrm{P}

bond due to high interelectronic repulsion of the non-bonding electrons, owing to the small bond length.

Statement II: The catenation tendency is stronger in nitrogen as compared to phosphorus.

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Correct option: B

Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I.

Option B (Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I) is correct because both statements are true, but the catenation tendency of nitrogen is weaker, not stronger, than that of phosphorus.

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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?