Chemistry Question Bank

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 + + + + + > > > > (…

Ionisation enthalpy i ( H kJ mol ) - D for the elements of Group 13 follows the order

The stability of +1 oxidation state increases in the se- quence:

Compound (B) is:

Compound (A) is:

Aluminium becomes passive in:

Which one of the following metals cannot be extracted by using Al as a reducing agent?

Anodised aluminium is :

The reaction which is not involved in thermite process: (a) 3Mn O 8Al 9Mn 4Al O + ¾¾® + (b) Cr O 2Al 2Cr Al O + ¾¾® + (c) 2Fe Al O Fe O 2Al + ¾¾® + (d) B O 2Al 2B Al O + ¾¾® +