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Which of the following halogen acids has the lowest melting point?

HCl

HBr

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Explanation

The boiling points of $H F, H C l, H B r a n d H I$ follow the order $H F > H I > H B r > H C l$ .
HF is hydrogen bonded, thus has highest boiling point, and it is liquid at or below 19 $^{o} C$ . The remaining hydrogen halides are gaseous and their boiling points depend on the van der waal's forces. Larger the size (or molecular mass), greater are the van der Waal's forces, hence higher is the boiling point.

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Boiling of dil. HCl acid does not increase its concentration beyond 22.2 per cent because hydrochloric acid:

is very volatile

is extremely soluble in water

forms a constant boiling mixture

forms a saturated solution at this concentration

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Explanation

(C)

When the concentration of HCl gas in water is 22.2% by weight, it forms a constant boiling mixture.

At this concentration, if dilute HCl is heated then water and HCl vaporises in same proportion by weight and

hence dilute hydrochloric acid cannot be diluted.

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Spirit of salt is:

HBr

HCl

$H_{2} S O_{4}$

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Explanation

Hydrochloric acid is a clear, colorless, highly pungent solution of hydrogen chlorine in water. It is also known as spirit of salt and muriatic acid.

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By the action of concentrated hydrochloric acid on potassium chlorate we get this mixture of gases:

$C O_{2} + C l_{2}$

$C l 2 + K C l + H 2 O$

$C l_{2} + C l O_{2}$

$O_{2} + C l_{2} + C l O_{2}$

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Explanation

$[{KClO}_{3} + HCl \to KCl + {HClO}_{3}] \times 2 2 H C l O_{3} + 2 H C l \to 2 {ClO}_{2} + {Cl}_{2} + 2 H_{2} O_______________________________2 {KClO}_{3} + 4 HCl \to 2 KCl + 2 {ClO}_{2} + {Cl}_{2} + 2 H_{2} O$

a mixture of chlorine and chlorine dioxide is obtained called euchlorine.

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Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. This is due to:

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

due to strong affinity for water, conc. HCl pulls moisture of air towards self. The moisture forms droplets of water and hence the cloud.

Conc. HCl emits strongly smelling HCl gas all the time

Oxygen in air reacts with mitted HCl gas to form a cloud of $C l_{2}$ gas

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Consider the following reactions:

(A) $C l_{2}$ reacts with an aqueous $N a_{2} S O_{3}$ solution

(B) $I_{2}$ is passed through suspension of iodine

(D) $C l_{2}$ is passed through aqueous $S O_{2}$ solution

Select the reactions in which HCl is produced

A, B, C, D

A, B, D

B, D

all of these

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Explanation

Dear all reactions are possible except 3rd

Because

Sulfur dioxide react with chlorine to produce sulfuryl chloride. This reaction takes place initiated by the absorption of energy in the form of light. In this reaction, the catalyst is can be activated carbon or camphor......

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Pure HBr has may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:

more volatile

less stable

a weaker acid

an oxidising agent

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Explanation

Concentrated sulfuric acid is an oxidizing agent and can oxidize HBr to bromine. Therefore, syrupy phosphoric acid is preferred over concentrated sulfuric acid for preparing pure HBr by heating with sodium bromide.

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HI reacts with $H N O_{3}$ to form:

$O_{2}$

$N_{2} O$

$H I O_{3}$

$N O_{2} + I_{2}$

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Explanation

2HI + 2HNO₃ → 2NO₂ + I₂ + 2H₂O

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Which of the following halogen oxides is ionic?

$I_{4} O_{9}$

$I_{2} O_{5}$

$B r O_{2}$

$C l O_{3}$

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Explanation

I₄O₉ exist as I⁺ (IO₃)₃^-

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Among halogens maximum oxides are formed by:

fluorine

chlorine

bromine

iodine

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Explanation

larger the size , lower the I.E, higher is the tendency to form oxide

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