19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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:
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because:
Electropositive charcter for the elements of group 13 follows the order
The reason behind the lower atomic radius of Ga as compared to Al is
Which one of the statements is incorrect for aluminium metals?
Aluminium exhibits +3 oxidation state. As we move down the group, +1 oxidation state gets more stable. This is a consequence of
Group 13 elements show +1 and +3 oxidation states. Relative stability of +3 oxidation state may be given as (a) Tl Ga Al B In + + + + + > > > > (b) B Al Ga In Tl + + + + + > > > > (c) Al Ga Tl In B + + + + + > > > > (…
The stability of +1 oxidation state increases in the se- quence:
Ionisation enthalpy i ( H kJ mol ) - D for the elements of Group 13 follows the order
Trimethylammonia is pyramidal whereas trisilylammonia is a planar molecule. Why ?
Specify the coordination geometry around and hybrid- ization of N and B atoms in 1:1 complex of BF3 and NH3:
The shapes and hybridisation of BF3 and BH- respectively are