JEE Main Chemistry – p-Block Elements Important Questions, MCQs & Practice Tests

Q 1 :

Two p-block elements X and Y form fluorides of the type ${EF}_{3}$ . The fluoride compound ${XF}_{3}$ is a Lewis acid and ${YF}_{3}$ is a Lewis base. The hybridizations of the central atoms of ${XF}_{3}$ and ${YF}_{3}$ respectively are [2026]

Both ${sp}^{2}$
Both ${sp}^{3}$
${sp}^{2}$ and ${sp}^{3}$
${sp}^{3}$ and ${sp}^{2}$

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$X F_{3} = B F_{3}; s p^{2}$

$Y F_{3} = N F_{3}; s p^{3}$

Q 2 :

Given below are two statements:

Statement I: The increasing order of boiling point of hydrogen halides is HCl < HBr < HI < HF.

Statement II: The increasing order of melting point of hydrogen halides is HCl < HBr < HF < HI.

In the light of the above statements, choose the correct answer from the options given below: [2026]

Both Statement I and Statement II are true
Statement I is false but Statement II is true
Statement I is true but Statement II is false
Both Statement I and Statement II are false

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$Correct order of$

$(i) Boiling point : HF > HI > HBr > HCl$

$(ii) Melting point : HI > HF > HBr > HCl$

Q 3 :

Given below are two statements :

Statement I : Elements ‘X’ and ‘Y’ are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides $X_{2} O_{3}$ and $Y_{2} O_{3}$ is acidic and amphoteric, respectively.

Statement II : $B C l_{3}$ is covalent in nature and gets hydrolysed in water. It produces ${[B {(O H)}_{4}]}^{-}$ and ${[B {(H_{2} O)}_{6}]}^{3 +}$ in aqueous medium.

In the light of the above statements, choose the correct answer from the options given below : [2026]

Both Statement I and Statement II are true
Statement I is false but Statement II is true
Statement I is true but Statement II is false
Both Statement I and Statement II are false

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$Electronegativity order : N > P > As > Sb$

$↑$ $↑$

Most electronegative Least electronegative

$X = N X_{2} O_{3} = N_{2} O_{3} (Acidic)$

$Y = Sb Y_{2} O_{3} = {Sb}_{2} O_{3} (Amphoteric)$

$Statement-I is true$

${BCl}_{3} + 3 H_{2} O \to B {(OH)}_{3} + 3 HCl$

$Statement-II is false$

Q 4 :

A student added aqueous chlorine to aqueous sodium bromide and the resulting mixture was shaken with an equal volume of trichloroethane.

Which diagram best represents the observation made?

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${Cl}_{2} + 2 NaBr \to {Br}_{2} + 2 NaCl$

${Cl}_{2} oxidises {Br}^{-}$ to ${Br}_{2}$ in trichloroethane and is reddish brown in colour. Two layers are observed as trichloroethane is immiscible with water.

Q 5 :

Match the Column – I and Column – II

Column – I Column – II

A) Hypophosphoric acid P) All hydrogens are ionizable in water

B) Pyrophosphoric acid Q) Lewis acid

C) Boric acid R) Monobasic acid

D) Hypophosphorous acid S) $s p^{3}$ hybridized central atom

A-PS; B-PS; C-QR; D-RS
A-QR; B-PS; C-PQ; D-RS
A-PS; B-QR; C-RS; D-S
A-QS; B-PR; C-PQ; D-P

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Q 6 :

Which one of the following orders is not in accordance with the property stated against it?

$F > C l > B r > I$ : Electronegativity
$F_{2} > C l_{2} > B r_{2} > I_{2}$ : Bond dissociation energy
$F_{2} > C l_{2} > B r_{2} > I_{2}$ : Oxidizing power
$H I > H B r > H C l > H F$ : Acidic strength

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(b) Bond dissociation energy order

$\begin{matrix} {Cl}_{2} & > & {Br}_{2} & > & F_{2} & > & I_{2} \\ 242.6 & 192.8 & 158.8 & 151.1 \end{matrix} \begin{matrix} kJ/mol \end{matrix}$

Q 7 :

Given below are two statements one is labelled as Assertion A and other is labelled as Reason R

Assertion A: Fluorine forms only one oxoacid HOF. Where as other halogens forms more

Reason R: Fluorine has smallest size among all halogen and is highly electronegative

In the light of above statements choose, The most appropriate answer from the options given below

A is correct but R is not correct
A is not correct but R is correct
Both A and R are correct and R is the correct explanation of A
Both A and R are correct and R is not the correct explanation of A

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Fluorine forms only oxy acid HOF due to smaller size and highest electronegativity

Q 8 :

Which of the following order is correct?

$E_{F_{2} / 2 F^{-}}^{\circ} < E_{C l_{2} / 2 C l^{-}}^{\circ} < E_{B r_{2} / 2 B r^{-}}^{\circ} < E_{I_{2} / 2 I^{-}}^{\circ} = E_{v a l u e s}^{\circ} (SRP values)$
$I > B r > C l > F; Electron affinity$
$F^{-} > C l^{-} > B r^{-} > I^{-};$ $|Hydration enthalpy|$
$F_{2} > C l_{2} > B r_{2} > I_{2}; Bond dissociation enthalpy$

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i) $F_{2} t o I_{2}; SRP values decreases$

ii) $C l > F > B r > I; electron affinity$

iii) $C l_{2} > B r_{2} > F_{2} > I_{2}; BDE$

Q 9 :

Given below are two statements:

Statement I: Oxidising power of halogens decreases in the order $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$ , which is the basis of "Layer test".

Statement II: "Layer test" to identify ${Br}_{2}$ and $I_{2}$ in aqueous solution involves the oxidation of bromide or iodide into ${Br}_{2}$ or $I_{2}$ respectively with ${Cl}_{2}$ , which is a type of displacement redox reaction.

In the light of the above statements, choose the correct answer from the options given below: [2026]

Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Statement I is false but Statement II is true

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Add 1 mL of ${CHCl}_{3}$ or ${CCl}_{4}$ and chlorine water in excess to the salt solution in water or sodium carbonate extract neutralised with dil. HCl and shake the test tube vigorously. Presence of violet and orange colouration in the organic layer confirms the presence of iodide and bromide ions respectively.

$2 NaI + {Cl}_{2} \to 2 NaCl + I_{2} (violet)$

$2 NaI + {Br}_{2} \to 2 NaBr + {Br}_{2} (orange)$

Topic Question Set

Q 1 :

Two p-block elements X and Y form fluorides of the type ${EF}_{3}$ . The fluoride compound ${XF}_{3}$ is a Lewis acid and ${YF}_{3}$ is a Lewis base. The hybridizations of the central atoms of ${XF}_{3}$ and ${YF}_{3}$ respectively are [2026]

Q 4 :

A student added aqueous chlorine to aqueous sodium bromide and the resulting mixture was shaken with an equal volume of trichloroethane.

Which diagram best represents the observation made?

Q 5 :

Match the Column – I and Column – II

Column – I Column – II

A) Hypophosphoric acid P) All hydrogens are ionizable in water

B) Pyrophosphoric acid Q) Lewis acid

C) Boric acid R) Monobasic acid

D) Hypophosphorous acid S) $s p^{3}$ hybridized central atom

(1)

Q 6 :

Which one of the following orders is not in accordance with the property stated against it?

Q 8 :

Which of the following order is correct?

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	Column – I		Column – II
A)	Hypophosphoric acid	P)	All hydrogens are ionizable in water
B)	Pyrophosphoric acid	Q)	Lewis acid
C)	Boric acid	R)	Monobasic acid
D)	Hypophosphorous acid	S)	$s p^{3}$ hybridized central atom

Topic Question Set

Q 1 : Two p-block elements X and Y form fluorides of the type EF3. The fluoride compound XF3 is a Lewis acid and YF3 is a Lewis base. The hybridizations of the central atoms of XF3 and YF3 respectively are [2026]

Q 4 : A student added aqueous chlorine to aqueous sodium bromide and the resulting mixture was shaken with an equal volume of trichloroethane. Which diagram best represents the observation made?

Q 5 : Match the Column – I and Column – II Column – I Column – II A) Hypophosphoric acid P) All hydrogens are ionizable in water B) Pyrophosphoric acid Q) Lewis acid C) Boric acid R) Monobasic acid D) Hypophosphorous acid S) sp3 hybridized central atom

(1)

Q 6 : Which one of the following orders is not in accordance with the property stated against it?

Q 8 : Which of the following order is correct?

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Q 1 :

Two p-block elements X and Y form fluorides of the type ${EF}_{3}$ . The fluoride compound ${XF}_{3}$ is a Lewis acid and ${YF}_{3}$ is a Lewis base. The hybridizations of the central atoms of ${XF}_{3}$ and ${YF}_{3}$ respectively are [2026]

Q 4 :

A student added aqueous chlorine to aqueous sodium bromide and the resulting mixture was shaken with an equal volume of trichloroethane.

Which diagram best represents the observation made?

Q 5 :

Match the Column – I and Column – II

Column – I Column – II

A) Hypophosphoric acid P) All hydrogens are ionizable in water

B) Pyrophosphoric acid Q) Lewis acid

C) Boric acid R) Monobasic acid

D) Hypophosphorous acid S) $s p^{3}$ hybridized central atom

Q 6 :

Which one of the following orders is not in accordance with the property stated against it?

Q 8 :

Which of the following order is correct?