19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Na2B4O7.10H2O is correctly represented as:
Which of the following is not true regarding the nature of halides of boron ?
In diborane,
On hydroloysis, diborane produces
Boric acid has a polymeric layer structure in which planar BO3 units are joined by
Boric acid is prepared from borax by the action of :
An aqueous solution of boric acid is found to be weakly acidic in nature. This acidic character arises due to the following reasons.
H3BO3 is:
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:
What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire ?
Which of the following compounds are formed when BCl3 is treated with water ?
Which of the following is the electron deficient molecule ?
Which is the hardest compound of boron ?
Borax is not used
Which is not the use of orthoboric acid ?
In BX3, B – X distance is shorter than what is expected theoretically because (X = F, Cl, Br, I)
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 > >
BF3 is used as catalyst in several industrial processes due to its:
Which one of the following statements regarding BF3 is not correct?
The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF - ?
Which of the following does not show similarity between boron and aluminium ?
When aluminium hydroxide dissolves in NaOH solution, the product is:
The main factor responsible for weak acidic nature of B—F bonds in BF3 is:
Which of the following compounds are formed when boron trichloride is treated with water?
Boron is unable to form BF - ions due to