Chemistry Question Bank

What are X and Y in the reaction ? heat 3B H 6X 3[BH (X) ] [BH ] Y 12H + - + ® ¾¾¾® +

A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form ‘A’ and HCl. ‘A’ is mixed with NH₃ and heated to 200 °C to form ‘B’. The formula of ‘B’ is:

Which of the following is correct?

Which one is the wrong statement ?

Alumina is:

From B₂H₆, all the following can be prepared except:

In SiO , - the tetrahedral molecule, two oxygen atoms are shared in

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

Which of the following is a false statement ?

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

Na₂B₄O₇.10H₂O is correctly represented as:

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

Which one of the following is the correct statement ?

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

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

In B₂H₆:

Borazole, B₃N₃H₆ is related to benzene as:

The structure of diborane (B₂H₆) contains :

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

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:

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…

H₃BO₃ is:

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

Which is the hardest compound of boron ?

Which of the following compounds are formed when BCl₃ is treated with water ?