19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
From B2H6, all the following can be prepared except:
o o Re d hot 100 C 160 C H BO X Y B O ; ¾¾¾® ¾¾¾® ¾¾¾® X and Y respectively are:
When strongly heated, orthoboric acid leaves a residue of:
Na B O X H BO . + ® What is X in the reaction ?
Which of the statement is true for the above sequence of reactions?
Boric acid is used in carrom boards for smooth gliding of pawns because:
In the structure of diborane
Na2B4O7.10H2O is correctly represented as:
Which of the following is not true regarding the nature of halides of boron ?
Which of the following is a false statement ?
The power of halides of boron to act as Lewis acids decreases in the order:
The main factor responsible for weak acidic nature of B—F bonds in BF3 is:
BCl3 does not exist as a dimer but BH3 exists as B2H6 because
BF3 is used as catalyst in several industrial processes due to its:
The decreasing order of power of boron halides to act as Lewis acids is (a) BF BCl BBr > > (b) BBr BCl BF > > (c) BCl BF BBr > > (d) BCl BBr BF > >
In BX3, B – X distance is shorter than what is expected theoretically because (X = F, Cl, Br, I)
Identify X and Y in the following reaction. NaBH 140ºC C H Cl BCl NH Cl X Y + ¾¾¾¾® ¾¾¾¾®
A gas other than HCl is obtained in : (a) Silent electric discharge BCl + H ¾¾¾¾¾® (b) LiAlH + BF ®
Which of the following statements about anhydrous alu- minium chloride is correct?
Which is not the use of orthoboric acid ?
Borax is not used
Which is the hardest compound of boron ?
Which of the following is the electron deficient molecule ?
Which of the following compounds are formed when BCl3 is treated with water ?
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…