Q. 494.4( 5 Votes )

An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

(a) Identify the element X.

(b) Write the electronic configuration of X.

(c) Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?

(d) What would be the nature (acidic/ basic) of oxides formed?

(e) Locate the position of the element in the Modern Periodic Table.

Answer :

(a) Element X is sulphur (atomic no. 16).


(b) Electronic configuration of ‘X’ is


K, L, M


2, 8, 6


(c) 2FeSO4 (s) Heat Fe2O3(s) + SO2 (g) + SO3(g)


(d) SO2 and SO3 are acidic oxides.


(e) It belongs to group 16 and 3rd period.


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