A) rhombic sulphur
B) colloidal sulphur
C) amorphous sulphur
D) plastic sulphur
Correct Answer: B
Solution :
Nitric- acid, being a strong oxidising agent, oxidises hydrogen sulphide into colloidal sulphur. \[3{{H}_{2}}S+2HN{{O}_{3}}\xrightarrow{{}}\underset{yellow\,ppt}{\mathop{3S}}\,\] \[+2NO+4{{H}_{2}}O\]
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