The P-Block Elements (XII)

Q1 FREE PREVIEW

PYQ

Element not showing variable oxidation state? (memory based jee mains shift-1 22/01/2025)

a

Br

b

I

c

Cl

d

F

✓ Correct answer: d)

F

Explanation

Fluorine does not show variable oxidation state due to absence of vacant-d orbitals

Q2 FREE PREVIEW

PYQ

Superacidity of \({\mathrm{HSO}}_{3}\mathrm{F}+{\mathrm{SbF}}_{5}\) is due to:

Memory Based Question 29/Jan/25 Evening shift

a

\({\mathrm{SbF}}_{6}^{-}\)

b

\({\mathrm{H}}_{2}{\mathrm{SO}}_{3}{\mathrm{F}}^{+}\)

c

\({\mathrm{SOF}}_{3}{{\mathrm{SbF}}_{3}}^{-}\)

d

\({\mathrm{HSO}}_{3}\mathrm{F}\)

✓ Correct answer: b)

\({\mathrm{H}}_{2}{\mathrm{SO}}_{3}{\mathrm{F}}^{+}\)

Explanation

Magic acid ( FSO ₃H·SbF ₅) is a superacid consisting of a mixture, most commonly in a 1:1 molar ratio, of fluorosulfuric acid ( HSO ₃F) and antimony pentafluoride ( SbF ₅). The super acidity of super acid is due to the formation of \({\mathrm{H}}_{2}{\mathrm{SO}}_{3}{\mathrm{F}}^{+}\)ion .

Q3

PYQ

Element not showing variable oxidation state? (memory based jee mains shift-1 22/01/2025)

a

Br

b

I

c

Cl

d

F

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Q4

PYQ

The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are

[JEE Advanced 2024, Paper-2]

a

\({\left[{\mathrm{PF}}_{4}\right]}^{+}{\left[{\mathrm{PF}}_{6}\right]}^{-}\)and \({\left[{\mathrm{PCl}}_{4}\right]}^{+}{\left[{\mathrm{PF}}_{6}\right]}^{-}\)

b

\({\left[{\mathrm{PCl}}_{4}\right]}^{+}{\left[{\mathrm{PCl}}_{4}{\mathrm{F}}_{2}\right]}^{-}\)and \({\left[{\mathrm{PCl}}_{4}\right]}^{+}{\left[{\mathrm{PF}}_{6}\right]}^{-}\)

c

\({\mathrm{PF}}_{3}\) and \({\mathrm{PCl}}_{3}\)

d

\({\mathrm{PF}}_{5}\) and \({\mathrm{PCl}}_{3}\)

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Q5

PYQ

Among Group 16 elements, which one does NOT show \(-2\) oxidation state?

a

\(PO\)

b

\(\mathrm{O}\)

c

\(\mathrm{Se}\)

d

\(\mathrm{Te}\)

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Q6

PYQ

Among Group 16 elements, which one does NOT show \(-2\) oxidation state?

a

\(PO\)

b

\(\mathrm{O}\)

c

\(\mathrm{Se}\)

d

\(\mathrm{Te}\)

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Q7

PYQ

The incorrect statement among the following is

[JEE Main 2025, 23 Jan (Shift 1)]

a

\({\mathrm{PF}}_{5}\mathrm{exist}\mathrm{but}{\mathrm{NF}}_{5}\mathrm{does}\mathrm{not}\)

b

\({\mathrm{SO}}_{2}\) can act as an oxidizing agent, but not as a reducing agent

c

\({\mathrm{PH}}_{3}\) shows lower proton affinity than\({\mathrm{NH}}_{3}\)

d

\({\mathrm{NO}}_{2}\) can dimerises easily

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Q8

PYQ

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

[JEE Main 2025, 29 Jan (Shift 2)]

a

\(1012kJmo{l}^{-1}\)

b

\(834kJmo{l}^{-1}\)

c

\(1402kJmo{l}^{-1}\)

d

\(947kJmo{l}^{-1}\)

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Q9

PYQ

Which of the following group-15 element forms \(p\pi -p\pi\) bond and strongest basic hydride? (memory based jee mains shift-2 28/01/2025)

a

Z=7

b

Z=15

c

Z=33

d

Z=51

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Q10

PYQ

Identify the incorrect statement from the following

[Re-NEET 2024]

a

The acidic strength of \(HX ( X = F , Cl , Br\) and I) follows the order : \(HF > HCl > HBr >\) \(HI\).

b

Fluorine exhibits -1 oxidation state whereas other halogens exhibit \(+1,+3,+5\) and +7 oxidation states also.

c

The enthalpy of dissociation of \(F _2\) is smaller than that of \(Cl _2\).

d

Fluorine is stronger oxidising agent than chlorine.

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Q11

PYQ

Which element in group-15 has lowest ionisation energy?

Memory Based Question 29/Jan/25 Evening shift

a

Bi

b

P

c

As

d

Sb

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Q12

PYQ

At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid (\({\mathrm{HNO}}_{2}\)) gives the species

[JEE Advanced 2024, Paper-1]

a

\({H}_{3}{O}^{+},N{{O}_{3}}^{−}andNO\)

b

\({H}_{3}{O}^{+},N{{O}_{3}}^{−}andN{O}_{2}\)

c

\({H}_{3}{O}^{+},N{O}^{−}andN{O}_{2}\)

d

\({H}_{3}{O}^{+},N{{O}_{3}}^{−}and{N}_{2}O\)

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Q13

PYQ

The nature of oxide \(\left({\mathrm{TeO}}_{2}\right)\) and hydride \(\left({\mathrm{TeH}}_{2}\right)\) formed by Te , respectively are

a

Oxidising and acidic

b

Reducing and basic

c

Reducing and acidic

d

Oxidising and basic

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Q14

PYQ

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

[JEE Main 2025, 24 Jan (Shift 1)]

a

Electronegativity

b

Atomicity

c

Atomic size

d

Electron gain enthalpy

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Q15

PYQ

Identify the correct statements about p-block elements and their compounds.
(A) Non metals have higher electronegativity than metals.
(B) Non metals have lower ionisation enthalpy than metals.
(C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic.
(D) The non-metal oxides are generally basic in nature.
(E) The metal oxides are generally acidic or neutral in nature.

Choose the correct answer from the options given below :

a

(D) and (E) only

b

(B) and (E) only

c

(B) and (D) only

d

(A) and (C) only

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Q16

PYQ

Which of the following group-15 element forms \(p\pi -p\pi\) bond and strongest basic hydride? (memory based jee mains shift-2 28/01/2025)

a

Z=7

b

Z=15

c

Z=33

d

Z=51

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Q17

PYQ

Element not showing variable oxidation state:

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

a

Br

b

I

c

Cl

d

F

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Q18

PYQ

The maximum covalency of a non-metallic group 15 element ' E ' with weakest E-E bond is

[JEE Main 2025, 22 Jan (Shift 2)]

a

4

b

5

c

6

d

3

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Q19

PYQ

Anomalous behavior of oxygen is due to its

a

large size and high electronegativity

b

large size and low electronegativity

c

small size and high electronegativity

d

small size and low electronegativity

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Q20

PYQ

Identify the incorrect statements about group 15 elements :
(A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.
(B) The common oxidation states of these elements are \(-3,+3\) and +5 .
(C) Nitrogen has unique ability to form \(p \pi- p \pi\) multiple bonds.
(D) The stability of +5 oxidation states increases down the group.
(E) Nitrogen shows a maximum covalency of 6.

Choose the correct answer from the options given below :

a

(A), (C), (E) only

b

(D) and (E) only

c

(A), (B), (C) only

d

(B), (D), (E) only

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Q21

PYQ

Incorrect Statement among the following is (JEE mains memory based shift-1 23/01/2025)

a

\({\mathrm{SO}}_{2}\) acts as oxidizing agent but not reducing agent

b

\({\mathrm{NO}}_{2}\) exist as a dimer

c

\({\mathrm{PF}}_{5}\mathrm{exists}\mathrm{but}{\mathrm{NF}}_{5}\) does not

d

\({\mathrm{PH}}_{3}\) has lower proton affinity than \({\mathrm{NH}}_{3}\)

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Q22

PYQ

The complete hydrolysis of \(\mathrm{ICl},{\mathrm{ClF}}_{3}\), and \({\mathrm{BrF}}_{5}\) respectively gives

[JEE Advanced 2025, Paper-2]

a

\(I{O}^{-},Cl{O}_{2}^{-}\text{and }Br{O}_{3}^{-}\)

b

\(I{O}_{3}^{-},Cl{O}_{2}^{-}\text{and }Br{O}_{3}^{-}\)

c

\(I{O}^{-},Cl{O}^{-}\text{and }Br{O}_{2}^{-}\)

d

\(I{O}_{3}^{-},Cl{O}_{4}^{-}\text{and }Br{O}_{2}^{-}\)

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