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JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Analyzing +4 | -1

Which of the following statements regarding properties of halogens are correct?

(i) Due to small size electron gain enthalpy of fluorine is less than that of chlorine.

(ii) Iodine has same physical state but different colour as compare to other members of the group.

(iii) Fluorine shows no positive oxidation state.

(iv) In

X_2(g)+H_2O(l) \to HX (aq) + HOX (aq)

(where

X_2=Cl

or

Br)

(v)

F_2

is the strongest oxidising halogen.

View answer and explanation

Correct option: B

(i), (iii), (iv) and (v)

Option B ((i), (iii), (iv) and (v)) is correct because it accurately describes the properties of halogens, including the electron gain enthalpy of fluorine, the absence of positive oxidation states for fluorine, the reaction of halogens with water, and the oxidizing strength of fluorine.

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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?