Chemistry Question Bank

AIF₃ is soluble in HF only in presence of KF. It is due to the formation of

The power of halides of boron to act as Lewis acids decreases in the order:

Boric acid is used in carrom boards for smooth gliding of pawns because:

The purest form of coal is

Identify the incorrect statement.

BCl₃ does not exist as a dimer but BH₃ exists as B₂H₆ because

Glass and cement are two important examples of

The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:

Which of the statement is true for the above sequence of reactions?

Borazole, B₃N₃H₆ is related to benzene as:

Which of the following compounds is known as inor- ganic benzene?

The hardest substance is

In B₂H₆:

NaBH₄ + I₂ ® X + Y + Z BF₃ + NaH 450 K ¾¾¾® X + P BF₃ + LiAlH₄ ® X + Q + R X, Y, Z, P, Q and R in the reactions are X Y Z P Q R (a) Na₄B₄O₇ NaI HI HF LiF AlF₃ (b) B₂H₆ NaI H₂ NaF LiF AlF₃ (c) B₂H₆ BH₃ NaI B₃N₃H₆ Al₂F₆…

Buckminsterfullerence is

Boric acid has a polymeric layer structure in which planar BO₃ units are joined by

On hydroloysis, diborane produces

In graphite, the layers of carbon atoms are held by

The structure of diborane (B₂H₆) contains :

Boron cannot form which one of the following anions? (a) BF⁻ (b) BH⁻

Identify the wrong example from the following for the group 14 elements.

The number of OH units directly linked to boron atoms in Na₂B₄O₇.10H₂O is:

What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire ?

In the purification of bauxite by Hall’s process:

Boric acid H₃BO₃ and BF₃ have the same number of elec- trons. The former is a solid and the latter is a gas. The reason is: