19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
On the addition of mineral acid to an aqueous solution of borax, the following compound is formed:
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…
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 ?
Which of the following statements about anhydrous alu- minium chloride is correct?
A gas other than HCl is obtained in : (a) Silent electric discharge BCl + H ¾¾¾¾¾® (b) LiAlH + BF ®
Identify X and Y in the following reaction. NaBH 140ºC C H Cl BCl NH Cl X Y + ¾¾¾¾® ¾¾¾¾®
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
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
Which of the following oxides is acidic in nature ?
Which of the following hydroxides is acidic ?
When aluminium is heated with conc. H2SO4
Aluminium does not react with: