Chemistry Question Bank

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:

Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not fomed in these conditions?

From B₂H₆, all the following can be prepared except:

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

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

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

Na B O X H BO . + ® What is X in the reaction ?

Which of the following is correct?

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

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

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

Which of the following is a false statement ?

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

Na₂B₄O₇.10H₂O is correctly represented as:

Which one of the following is the correct statement ?

Which one is the wrong statement ?

The structure of diborane (B₂H₆) contains :

In B₂H₆:

H₃BO₃ is:

Borazole, B₃N₃H₆ is related to benzene as:

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 ?

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:

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

Which of the following statements about anhydrous alu- minium chloride is correct?