19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one is the wrong statement ?
From B₂H₆, all the following can be prepared except:
Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:
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:
Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order
Which of the following is a false statement ?
Na₂B₄O₇.10H₂O is correctly represented as:
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:
Which one of the following is the correct statement ?
BCl₃ does not exist as a dimer but BH₃ exists as B₂H₆ because
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?
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…
Boron cannot form which one of the following anions? (a) BF⁻ (b) BH⁻
Na B O X H BO . + ® What is X in the reaction ?
The structure of diborane (B₂H₆) contains :
Graphite is soft while diamond is hard because
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 ?
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in [B(OH)₄]– and the geometry of the complex a…
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: