JEE Main entrance exam Question Bank Solutions for Chemistry (JEE Main)

Which of the following compounds are formed when boron trichloride is treated with water?

A and B are:

In diborane ______.

A pyranose ring consists of a skeleton of ______.

A mixture of benzene and chloroform is separated by ______.

MgBr₂ and Mgl₂ are soluble in acetone because of ______.

On the addition of mineral acid to an aqueous solution of borax, the compound formed is ______.

\[\ce{X <-[red P][HI] CH3COOH ->[LiAlH4] Y.}\]

What does Not true for X and Y?

Fig. I	Fig. II

In figure-I, an air column of length ℓ₁ is entrapped by a column of Hg of length 8 cm. In figure-II length of same air column at the same temperature is ℓ₂. The `ℓ_1/ℓ_2` is:
(1 atm = 76 cm of Hg)

Boron reacts with nitric acid to form ______.

When aqueous solution of AICl₃ is concentrated, it furnishes crystals of ______.

2 litre He gas at 2 atm and 300 K is inserted into a 4 litre rigid container containing N₂ at 600 K and 4 atm. Finally mixture is maintained at 600 K temperature. The final pressure of gaseous mixture would be ______ torr.

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 0.50 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. The partial pressure of the gases B is ______ mm Hg.

Which one of the following methods is used to prepare borax crystals?

PbCl₄ exists but PbBr₄ and Pbl₄ do not because of ______.

In the given reaction final product(s) will be:

A gaseous mixture of He and O₂ is found to have a density of 0.518 gL^-1 at 25° C and 720 torr. The mass percent of helium in this mixture is ______.

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in a basic medium is ______. 

Potassium permanganate on heating at 513 K gives a product which is ______.

Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of ______.