The chemical reactivity can be illustrated by comparing the reaction of elements with oxygen to form oxides and the nature of the oxides.
Alkali metals present on the extreme left of the modem periodic table are highly reactive and thus, they react vigorously with oxygen to form oxides such as Na2O which reacts with water to form strong bases like NaOH.
The reactive elements on the right i.e., halogens react with oxygen to form oxides such as Cl2O7 which on reaction with water form strong acids like HClO4.
The oxides of the elements in the centre of the main group elements are either amphoteric (Al2O3) neutral (CO,NO) or weakly acidic (CO2).
Balanced chemical equation is symbolic representation of a chemical reaction. It provides the following information, which is useful in solving problems based on chemical equations :
It indicates the number of...
Group 18 is the last group of p-block and include noble or inert gases.
They have closed valence shells (complete duplet in the case of ‘He’ and complete octet in the...
i. Valency of an element:
Valency of an element indicates the number of chemical bonds that the atom can form giving a molecule.
The most fundamental chemical property of an element is...
d-block (transition) elements and f-block (inner transition) elements exhibit very small change in atomic radii.
Therefore, the transition and inner transition elements belonging to the individual series have similar chemical properties.
Their...
(1) (a) ammonia is less dense than air
(b) solubility in water
(c) 2NH3 + H2SO4 → (NH4)2SO4
(2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides.
(b) CuO,...
Dihydrogen reduces oxides and ions of some metals that are less reactive than iron, to the corresponding number of halogen metals at moderate temperature.
e.g.
i. CuO(s) + H2(g) → Cu(s) +...