19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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:
Na B O X H BO . + ® What is X in the reaction ?
Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not fomed in these conditions?
What are X and Y in the reaction ? heat 3B H 6X 3[BH (X) ] [BH ] Y 12H + - + ® ¾¾¾® +
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
The most stable form of carbon at high temperature is X. The C – C bond length in diamond is Y while C – C bond length in graphite is Z. What are X, Y and Z respectively ?
Which of the statement is true for the above sequence of reactions?
BCl₃ does not exist as a dimer but BH₃ exists as B₂H₆ because
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Galena (i) Abrasive (B) Diamond (ii) Metal carbonyls (C) Carbon monoxide (iii) Hydrides of Si (D) Silanes (iv) An ore of lead
The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:
Which one of the following is the correct statement ?
The reaction which is not involved in thermite process: (a) 3Mn O 8Al 9Mn 4Al O + ¾¾® + (b) Cr O 2Al 2Cr Al O + ¾¾® + (c) 2Fe Al O Fe O 2Al + ¾¾® + (d) B O 2Al 2B Al O + ¾¾® +
The power of halides of boron to act as Lewis acids decreases in the order:
Which of the following compounds is known as inor- ganic benzene?
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…
Boron cannot form which one of the following anions? (a) BF⁻ (b) BH⁻
Which of the following is not matched correctly with its use ?
Which of the following is a false statement ?
Anodised aluminium is :
On hydroloysis, diborane produces
The correct order of atomic radii in group 13 elements is (NEET 2018)
The structure of diborane (B₂H₆) contains :
Boric acid has a polymeric layer structure in which planar BO₃ units are joined by
Which of the following compounds is used in cosmetic surgery? (Odisha NEET 2019)
In B₂H₆: