1. In nature, sulfur is found in both the free state and the combined state. Which statement is correct?
A.
Sulfur occurs only in the free state
B.
Sulfur occurs only in the combined state
C.
Sulfur occurs in both the free and combined states
D.
Sulfur does not occur naturally
Correct Answer:
Sulfur occurs in both the free and combined states
Explanation:
Natural sulfur is found as free sulfur in underground deposits and in combined forms such as sulfides and sulfates.
2. Where are major underground deposits of free sulfur found naturally?
A.
Near volcanic regions
B.
In polar ice caps
C.
In ocean water only
D.
In river sand only
Correct Answer:
Near volcanic regions
Explanation:
Free sulfur occurs naturally in underground deposits, especially in regions associated with volcanic activity.
3. In which type of compounds is sulfur commonly found in the combined state?
A.
Sulfides and sulfates
B.
Nitrates and phosphates only
C.
Chlorides and fluorides only
D.
Carbonates and bicarbonates only
Correct Answer:
Sulfides and sulfates
Explanation:
Sulfur commonly occurs in nature in combined forms as sulfide minerals and sulfate minerals.
4. Which mineral is an important natural sulfide ore containing sulfur?
A.
Galena
B.
Gypsum
C.
Barite
D.
Calcite
Correct Answer:
Galena
Explanation:
Galena is lead sulfide, PbS, and is a naturally occurring sulfide mineral containing sulfur.
5. Which mineral is commonly known as zinc blende and contains sulfur?
A.
ZnS
B.
CaSO4·2H2O
C.
BaSO4
D.
Fe2O3
Correct Answer:
ZnS
Explanation:
Zinc blende is zinc sulfide, ZnS, a naturally occurring sulfide mineral of sulfur.
6. Iron pyrites, a natural mineral containing sulfur, has which formula?
A.
FeS2
B.
FeSO4
C.
Fe2O3
D.
FeCl3
Correct Answer:
FeS2
Explanation:
Iron pyrites is iron disulfide, FeS2, and is one of the naturally occurring sulfide minerals of sulfur.
7. Which naturally occurring mineral is a sulfate of calcium?
A.
Gypsum
B.
Galena
C.
Zinc blende
D.
Iron pyrites
Correct Answer:
Gypsum
Explanation:
Gypsum is calcium sulfate dihydrate, CaSO4·2H2O, and represents the occurrence of sulfur in the sulfate form.
8. What is the chemical formula of gypsum, a natural sulfate mineral?
A.
CaSO4·2H2O
B.
PbS
C.
ZnS
D.
FeS2
Correct Answer:
CaSO4·2H2O
Explanation:
Gypsum occurs naturally as hydrated calcium sulfate with the formula CaSO4·2H2O.
9. Which mineral is naturally occurring barium sulfate?
A.
Barite
B.
Gypsum
C.
Galena
D.
Zinc blende
Correct Answer:
Barite
Explanation:
Barite is barium sulfate, BaSO4, and is a natural mineral in which sulfur occurs as sulfate.
10. Which of the following correctly represents a natural source of sulfur in the free state?
A.
Underground sulfur deposits
B.
Sodium chloride crystals
C.
Pure limestone deposits
D.
Aluminium metal ores only
Correct Answer:
Underground sulfur deposits
Explanation:
Sulfur occurs in the free state in underground deposits, particularly in areas connected with volcanic activity.
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