A) Monoclinic
B) Rhombic
C) Plastic
D) Colloidal
Correct Answer: C
Solution :
Allotropic forms of sulphur (i) Rhombic sulphur: It is prepared by evaporating solution of roll sulphur in \[\text{C}{{\text{S}}_{\text{2}}}\text{.}\] (ii) Monoclinic or Prismatic sulphur: It is prepared by melting sulphur in a dish and cooling till crust is formed. Two holes are made in the crust and liquid poured out. On removing the crust, colourless needle-shaped crystals of prismatic sulphur are seen. (iii) Plastic sulphur: It is obtained by pouring boiling sulphur in cold water when rubber like mass is obtained. (iv) Milk of sulphur: It is obtained by boiling milk of lime with sulphur and decomposing the calcium pentasulphide thus formed with HC1 when milk of sulphur is precipitated as white amorphous precipitate.
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