Among the following halogens F2, Cl2, Br2 and I2
Which can undergo disproportionation reaction?
Important Questions on The p-Block Elements
Identify the incorrect statements about group 15
elements :
(A) Dinitrogen is a diatomic gas which acts like an
inert gas at room temperature.
(B) The common oxidation states of these
elements are –3, +3 and +5.
(C) Nitrogen has unique ability to form
multiple bonds.
(D) The stability of +5 oxidation states increases
down the group.
(E) Nitrogen shows a maximum covalency of 6.
Choose the correct answer from the options given
below.
Identify the correct statements about p-block
elements and their compounds.
(A) Non metals have higher electronegativity than
metals.
(B) Non metals have lower ionisation enthalpy
than metals.
(C) Compounds formed between highly reactive
nonmetals and highly reactive metals are
generally ionic.
(D) The non-metal oxides are generally basic in nature.
(E) The metal oxides are generally acidic or
neutral in nature.
The ions make the enamel on teeth much harder
by converting hydroxyapatite (the enamel on the
surface of teeth) into much harder fluoroapatite
having the formula.
Assertion (A) : and the other is labelled as Reason (R).
Assertion (A) : Both rhombic and monoclinic
sulphur exist as S8 while oxygen exists as O2.
Reason (R) : Oxygen forms - multiple bonds
with itself and other elements having small size
and high electronegativity like C, N, which is not
possible for sulphur.
In the light of the above statements, choose the
most appropriate answer from the options given
below :
Match List I with List II
Choose the correct answer from the options given
below :
formula of fuming sulphuric acid is _______.
group 14 elements. The atomic number of the
element with lowest melting point is:
