Question

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

A. oxygen in air reacts with the emitted $$HCl$$  gas to forma cloud of chlorine gas  
B. strong affinity of $$HCl$$  gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke.
C. 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.
D. concentrated hydrochloric acid emits strongly smelling $$HCl$$  gas all the time.
Answer :   oxygen in air reacts with the emitted $$HCl$$  gas to forma cloud of chlorine gas
Solution :
$$4HCl + \mathop {{O_2}}\limits_{air} \to \mathop {2C{l_2} + 2{H_2}O}\limits_{cloud\,of\,white\,fumes} $$

Releted MCQ Question on
Inorganic Chemistry >> P - Block Elements

Releted Question 1

The reddish brown coloured gas formed when nitric oxide is oxidised by air is

A. $${N_2}{O_5}$$
B. $${N_2}{O_4}$$
C. $$N{O_2}$$
D. $${N_2}{O_3}$$
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Releted Question 2

The temporary hardness of water due to calcium carbonate can be removed by adding —

A. $$CaC{O_3}$$
B. $$Ca{\left( {OH} \right)_2}\,$$
C. $$CaC{l_2}$$
D. $$\,HCl$$
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Releted Question 3

Which of the following is most stable to heat

A. $$HCl$$
B. $$HOCl$$
C. $$HBr$$
D. $$HI$$
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Releted Question 4

White $$P$$ reacts with caustic soda. The products are $$P{H_3}$$ and $$Na{H_2}P{O_2}.$$   This reaction is an example of

A. Oxidation
B. Reduction
C. oxidation and reduction
D. Neutralisation
View Answer

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P - Block Elements

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