Question

The gram molecular mass of Sulphur in its own crown shape is:
(a) 128g
(b) 64g
(c) 256 g
(d) 32 g

Answer 1

Hint: Sulphur is non-metal belonging to the p-block elements and has the molecular mass as 32 . In its crown shape, there are 8 Sulphur atoms and we know the gram molecular mass of one Sulphur atom and by using this, we can easily calculate the gram molecular mass of Sulphur in its crown shape.

Complete Solution :
Sulphur is a non-metal and lies in the 16th group of the period table and comes under the category of the oxygen family and belongs to the p-block elements. It has an atomic number as 16 and mass number as 32.
- It is pale yellow and crystalline solid and has no taste but has little characteristic smell. It is insoluble in water and its particles float on the surface of the water and form a yellow film on the surface of the water.
- The burning of the Sulphur produces blue flame due to the formation of the Sulphur dioxide . It is insoluble in water but soluble in non-polar solvents such as benzene etc.
In ​ molecule , there are eight Sulphur molecules which are covalently bonded to each other and forms a closed crown shaped structure as:

- Since, we know the molecular mass of one Sulphur atom is 32.
And there are 8 Sulphur atoms, so the mass of Sulphur in the crown shaped structure is = 8 × 32 = 256 g So, the correct answer is “Option C”.

Note: Sulphur exists in a large number of allotropic forms (i.e. different structural forms of the same elements and hence, exhibit different chemical and physical properties). Two known allotropic forms of Sulphur are rhombic Sulphur and monoclinic Sulphur. The only difference between rhombic and monoclinic Sulphur is that the rhombic Sulphur exists as rhombic octahedral crystals whereas on the other hand ,monoclinic Sulphur exists in the form of long and needle-shaped prisms.