Chemical composition of cinnabar is____________________?
Correct answer: B. HgS
- A. FeS2
- B. HgS
- C. PbS
- D. ZnS
Explanation
Cinnabar is the naturally occurring red form of mercury(II) sulfide, HgS. The other sulfides belong to iron, lead and zinc respectively: FeS2 is pyrite, PbS is galena and ZnS is zinc blende. Students may choose PbS because galena is also a well-known sulfide ore.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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