Group 17 Elements

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JEE Advanced 2026

Correct statement(s) about the compounds $X$ , $Y$ and $Z$ is (are) $MnO_{2} + Conc. HCl ⟶ MnCl_{2} + (greenish yellow gas) X + H_{2} O$ $NH_{3} + (excess) X ⟶ Y + \dots$ $X + (excess) F_{2} 573 K Z$

X

is used for sterlizing drinking water.

(B)

Y

has a planar structure.

(C)

Z

is used in the enrichment of

^{235} U

(D)

Y

is a stronger Lewis base than ammonia.

JEE Advanced 2025

LEVELJEE Main

The complete hydrolysis of $ICl$ , $ClF_{3}$ and $BrF_{5}$ , respectively, gives

(A)

IO^{-}

ClO_{2}^{-}

and

BrO_{3}^{-}

(B)

IO_{3}^{-}

ClO_{2}^{-}

and

BrO_{3}^{-}

(C)

IO^{-}

ClO^{-}

and

BrO_{2}^{-}

(D)

IO_{3}^{-}

ClO_{4}^{-}

and

BrO_{2}^{-}

JEE Advanced 2020

LEVELJEE Advanced

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

* Multiple Correct Options

(A)

The hypochlorite ion is the strongest conjugate base.

(B)

The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl.

(C)

The hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.

(D)

The hypochlorite ion oxidizes the sulfite ion.

JEE Advanced 2015

LEVELJEE Main

The correct statement(s) regarding, (i) $HClO$ , (ii) $HClO_{2}$ , (iii) $HClO_{3}$ and (iv) $HClO_{4}$ , is(are)

* Multiple Correct Options

(A)

The number of

Cl = O

bonds in (ii) and (iii) together is two

(B)

The number of lone pairs of electrons on

Cl

in (ii) and (iii) together is three

(C)

The hybridization of

Cl

in (iv) is

sp^{3}

(D)

Amongst (i) to (iv), the strongest acid is (i)

JEE Advanced 2022

LEVELJEE Main

The reaction of $HClO_{3}$ with $HCl$ gives a paramagnetic gas, which upon reaction with $O_{3}$ produces

(A)

Cl_{2} O

(B)

ClO_{2}

(C)

Cl_{2} O_{6}

(D)

Cl_{2} O_{7}

JEE Advanced 2021

LEVELJEE Main

Ozonolysis of $ClO_{2}$ produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is _______.

JEE Advanced 2017

LEVELJEE Advanced

The colour of the $X_{2}$ molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to -

* Multiple Correct Options

(A)

the physical state of

X_{2}

at room temperature changes from gas to solid down the group

(B)

decrease in HOMO-LUMO gap down the group

(C)

decrease in

π^{*}

σ^{*}

down the group

(D)

decrease in ionization energy down the group

JEE Main 2021

LEVELJEE Main

The correct order of bond dissociation enthalpy of halogens is

(A)

F_{2} > C l_{2} > B r_{2} > I_{2}

(B)

I_{2} > B r_{2} > C l_{2} > F_{2}

(C)

C l_{2} > B r_{2} > F_{2} > I_{2}

(D)

C l_{2} > F_{2} > B r_{2} > I_{2}

JEE Main 2021

LEVELJEE Main

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

(A)

ClF_{3}

(B)

O_{2} F_{2}

(C)

I_{2} O_{5}

(D)

BrO_{3}

JEE Main 2019

LEVELJEE Main

HF has highest boiling point among hydrogen halides, because it has

(A)

lowest ionic character

(B)

strongest van der Waals' interactions

(C)

strongest hydrogen bonding

(D)

lowest dissociation enthalpy

JEE Main 2021

LEVELJEE Main

The absolute value of the electron gain enthalpy of halogens satisfies

Which one of the following correctly represents the order of stability of oxides, $X_{2} O$ ( $X = halogen$ ) ?

Among the following reactions of hydrogen with halogens, the one that requires a catalyst is

(A)

H_{2} + Cl_{2} ⟶ 2 HCl

(B)

H_{2} + I_{2} ⟶ 2 HI

(C)

H_{2} + F_{2} ⟶ 2 HF

(D)

H_{2} + Br_{2} ⟶ 2 HBr

JEE Main 2021

LEVELJEE Main

Number of $Cl = O$ bonds in chlorous acid, chloric acid and perchloric acid respectively are

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

(A)

concentrated hydrochloric acid emits strongly smelling HCl gas all the time

(B)

oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

(C)

strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

(D)

due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence, the cloud

JEE Main 2004

LEVELJEE Main

Which among the following factors is the most important in making fluorine the strongest oxidising agent ?

Bond dissociation energy

JEE Main 2020

LEVELJEE Main

In the following reactions, products $(A)$ and $(B)$ , respectively, are $NaOH + Cl_{2} \to (A) + side products$ (hot and conc.) $Ca(OH)_{2} + Cl_{2} \to (B) + side products$ (dry)

(A)

NaClO_{3}

and

Ca(OCl)_{2}

(B)

NaClO_{3}

and

Ca(ClO_{3})_{2}

(C)

NaOCl

and

Ca(OCl)_{2}

(D)

NaOCl

and

Ca(ClO_{3})_{2}

JEE Main 2020

LEVELJEE Main

The number of Cl == O bonds in perchloric acid is ''..........''.

JEE Main 2021

LEVELJEE Main

Choose the incorrect statement.

(A)

C l_{2}

is more reactive than ClF.

(B)

F_{2}

is more reactive than ClF.

(C)

On hydrolysis ClF forms HOCl and HF.

(D)

F_{2}

is a stronger oxidising agent than

C l_{2}

in aqueous solution.

JEE Main 2019

LEVELJEE Main

Iodine reacts with concentrated $HNO_{3}$ to yield $Y$ along with other products. The oxidation state of iodine in $Y$ , is

What products are expected from the disproportionation reaction of hypochlorous acid ?

(A)

HClO_{3}

and

Cl_{2} O

(B)

HClO_{2}

and

HClO_{4}

(C)

HCl

and

Cl_{2} O

(D)

HCl

and

HClO_{3}

JEE Main 2015

LEVELJEE Main

Which among the following is the most reactive?

(A)

Cl_{2}

(B)

Br_{2}

(C)

I_{2}

(D)

ICl

LEVELJEE Main

HOCl > HClO_{2} > HClO_{3} > HClO_{4}

(B)

HClO_{4} > HOCl > HClO_{2} > HClO_{3}

(C)

HClO_{4} > HClO_{3} > HClO_{2} > HOCl

(D)

HClO_{2} > HClO_{4} > HClO_{3} > HOCl

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The complete hydrolysis of ICl, ClF3​ and BrF5​, respectively, gives

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct statement(s) regarding, (i) HClO, (ii) HClO2​, (iii) HClO3​ and (iv) HClO4​, is(are)

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The reaction of HClO3​ with HCl gives a paramagnetic gas, which upon reaction with O3​ produces

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Ozonolysis of ClO2​ produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is _______.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The colour of the X2​ molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to -

The correct order of bond dissociation enthalpy of halogens is

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

HF has highest boiling point among hydrogen halides, because it has

The absolute value of the electron gain enthalpy of halogens satisfies

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which one of the following correctly represents the order of stability of oxides, X2​O (X=halogen) ?

Among the following reactions of hydrogen with halogens, the one that requires a catalyst is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

Which among the following factors is the most important in making fluorine the strongest oxidising agent ?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In the following reactions, products (A) and (B), respectively, are NaOH+Cl2​→(A)+side products (hot and conc.) Ca(OH)2​+Cl2​→(B)+side products (dry)

The number of Cl == O bonds in perchloric acid is ''..........''.

Choose the incorrect statement.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Iodine reacts with concentrated HNO3​ to yield Y along with other products. The oxidation state of iodine in Y, is

What products are expected from the disproportionation reaction of hypochlorous acid ?

Which among the following is the most reactive?

The correct order of the thermal stability of hydrogen halides (H—X) is

The number of halogen (s) forming halic (V) acid is

Among the following oxoacids, the correct decreasing order of acid strength is

The complete hydrolysis of $ICl$ , $ClF_{3}$ and $BrF_{5}$ , respectively, gives

The correct statement(s) regarding, (i) $HClO$ , (ii) $HClO_{2}$ , (iii) $HClO_{3}$ and (iv) $HClO_{4}$ , is(are)

The reaction of $HClO_{3}$ with $HCl$ gives a paramagnetic gas, which upon reaction with $O_{3}$ produces

Ozonolysis of $ClO_{2}$ produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is _______.

The colour of the $X_{2}$ molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to -

Which one of the following correctly represents the order of stability of oxides, $X_{2} O$ ( $X = halogen$ ) ?

Number of $Cl = O$ bonds in chlorous acid, chloric acid and perchloric acid respectively are

In the following reactions, products $(A)$ and $(B)$ , respectively, are $NaOH + Cl_{2} \to (A) + side products$ (hot and conc.) $Ca(OH)_{2} + Cl_{2} \to (B) + side products$ (dry)

Iodine reacts with concentrated $HNO_{3}$ to yield $Y$ along with other products. The oxidation state of iodine in $Y$ , is