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JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

1 Easy

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Analyzing +4 | -1

Which of the following statements are correct?

(I)

{HF}

is a stronger acid than

{HCl}

(II) Among halide ions, iodide is the most powerful reducing agent.

(III) Fluorine is the only halogen that does not show a variable oxidation state.

(IV)

{HOCl}

is a stronger acid than

{HOBr}

.

View answer and explanation

Correct option: D

II, III and IV

The correct answer is D (II, III and IV) because iodide is the strongest reducing agent, fluorine has a fixed oxidation state, and HOCl is a stronger acid than HOBr.

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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?