1. Tellurium is commonly found in gold ores in the form of which compounds?
A.
Tellurides
B.
Carbonates
C.
Nitrates
D.
Phosphates
Correct Answer:
Tellurides
Explanation:
Tellurium occurs in gold ores mainly as telluride minerals, in which tellurium is combined with metals such as gold and silver.
2. Which element is commonly associated with tellurium in telluride gold ores?
A.
Gold
B.
Sodium
C.
Calcium
D.
Magnesium
Correct Answer:
Gold
Explanation:
Tellurium is notably associated with gold in gold ores, forming gold telluride minerals.
3. Calaverite, a mineral found in some gold ores, is mainly a telluride of which metal?
A.
Gold
B.
Iron
C.
Copper
D.
Aluminium
Correct Answer:
Gold
Explanation:
Calaverite is a naturally occurring gold telluride with the formula AuTe2.
4. What is the principal anion-containing group in minerals such as calaverite?
A.
Telluride
B.
Chloride
C.
Sulfate
D.
Oxide
Correct Answer:
Telluride
Explanation:
Calaverite belongs to the telluride minerals, so its anion-containing group is telluride.
5. Which formula represents calaverite, a gold telluride mineral?
A.
AuTe2
B.
AuCl3
C.
Au2O3
D.
Au2S3
Correct Answer:
AuTe2
Explanation:
Calaverite is represented by the formula AuTe2, showing that it is a compound of gold and tellurium.
6. The occurrence of tellurium in gold ores is best described as its presence as:
A.
A metallic gold telluride
B.
A dissolved alkali metal salt
C.
A hydrated nitrate
D.
A calcium carbonate deposit
Correct Answer:
A metallic gold telluride
Explanation:
In gold ores, tellurium is commonly present in tellurides formed with gold and other precious metals.
7. Which mineral is an example of a gold telluride containing tellurium?
A.
Calaverite
B.
Calcite
C.
Gypsum
D.
Halite
Correct Answer:
Calaverite
Explanation:
Calaverite is a well-known gold telluride mineral found in certain gold ores.
8. Sylvanite is associated with gold ores because it contains tellurium combined mainly with:
A.
Gold and silver
B.
Sodium and potassium
C.
Calcium and magnesium
D.
Aluminium and iron
Correct Answer:
Gold and silver
Explanation:
Sylvanite is a gold-silver telluride mineral, commonly represented approximately by the formula (Au,Ag)Te2.
9. Which statement about tellurium in gold ores is correct?
A.
It occurs mainly as telluride minerals.
B.
It occurs only as elemental tellurium.
C.
It occurs mainly as sodium telluride in seawater.
D.
It occurs only as telluric acid.
Correct Answer:
It occurs mainly as telluride minerals.
Explanation:
The important natural occurrence of tellurium in gold ores is as telluride minerals, especially gold and silver tellurides.
10. Why are some gold ores described as telluride ores?
A.
They contain gold combined with tellurium.
B.
They contain only pure tellurium metal.
C.
They contain gold combined with oxygen only.
D.
They contain tellurium dissolved in water.
Correct Answer:
They contain gold combined with tellurium.
Explanation:
Gold ores containing minerals in which gold is chemically combined with tellurium are called gold telluride ores.
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