Chemistry MCQ

Assertion (A): Dry HCl is collected by the downward displacement of air.
Reason (R): HCl is heavier than air.

Assertion (A): In moist air, HCl strongly fumes.
Reason (R): HCl dissolves in water vapour to form tiny droplets of hydrochloric acid.

Assertion (A): HCl stains the skin or dry wood to amber-brown colour.
Reason (R): HCl is a corrosive acid.

A student added dilute H₂SO₄ in various metallic chlorides present in four test tubes during the preparation of HCl gas.

In which test tube(s), she would observe blue colouration in the test tubes?

The solution of nitrate(s) of metal(s) which form white precipitate with dil. HCl are:

The precipitate lead chloride in Question 34 (above) along with rest of the reaction mixture is boiled. It is seen that:

When hydrochloric acid is added in lead nitrate solution, then a precipitate of lead chloride is formed which is:

A salt of sodium which on boiling with conc. HCl gives reddish brown fumes of nitrogen gas is :

Which is not a correct statement?
When Na₂CO₃ is treated with dilute hydrochloric acid :

Hydrogen chloride gas is dried by bubbling it through conc. H₂SO₄ because :

One volume of water at room temperature will absorb :

Hydrogen chloride gas is heavier than air because its vapour density is :

During the laboratory preparation of hydrogen chloride gas from common salt and conc. H₂SO₄, the salt formed is sodium hydrogen sulphate, only when the temperature of mixture is:

The sodium chloride and conc. sulphuric acid mixture should not be heated beyond 200°C, because :

Sodium chloride is used in the preparation of hydrogen chloride gas because :

Iron shavings react with dilute hydrochloric acid to form :

Concentrated or dilute sulphuric acid does not react with lead chloride, because :

Which is not a correct statement?
Hydrochloric acid is used in:

When potassium dichromate (K₂Cr₂O₇) is boiled with conc. HCl, the products of reaction are :

When equal volumes of a mixture of hydrogen and chlorine are exposed to direct sunlight, they :

Traces of hydrochloric acid is present in :

When copper nitrate crystals are boiled with conc. HCl, the products formed are :

An acid commonly applied on the surface of metal before soldering or welding is :

The products formed when sodium thiosulphate solution is mixed with dilute hydrochloric acid are :

Black copper(II) oxide is placed in a beaker containing hydrochloric acid. After one hour the colour of reaction mixture changes to :

Aqua regia is a mixture of :

The products formed when zinc sulphite is treated with dil HCl are :

A metallic carbonates react with dilute hydrochloric acid to form their respective :

The products formed when potassium hydrogen sulphite [KHSO₃] is treated with dilute HCl are :

The advantage of using inverted funnel for the absorption of HCl gas in water is :

In a beaker containing dilute HCl is poured 2 g of black copper (II) oxide. The beaker is left undisturbed for 1 hour. After this time interval the colour of reaction mixture is:

HCl gas is extremely soluble in water. One volume of water at 20°C can absorb :

Hydrogen chloride gas is collected :

In order to find that a given jar is filled with HCl gas, a glass rod dipped in ________ solution is held near its mouth.

The salt formed when sodium chloride and conc. sulphuric acid are heated below 200°C is :

The drying agent used in the laboratory during the preparation of dry HCl gas is :

In the preparation of hydrogen chloride gas in laboratory, the reaction mixture should be :

The aim of fountain experiment is to prove

When the equal volumes of hydrogen gas and chlorine gas are exposed to diffused sunlight, the reaction :

The gastric juice secreted by the walls of the stomach contains :