1. Polonium is found naturally mainly in association with which type of ores?
A.
Uranium ores
B.
Sodium chloride deposits
C.
Limestone ores
D.
Bauxite ores
Correct Answer:
Uranium ores
Explanation:
Polonium occurs naturally in trace amounts in uranium ores as a product of radioactive decay.
2. The natural abundance of polonium in the Earth's crust is best described as
A.
Very high
B.
Moderate
C.
Very low
D.
Equal to that of oxygen
Correct Answer:
Very low
Explanation:
Polonium is present only in extremely small amounts in nature because it is a rare radioactive element.
3. Polonium occurs in uranium minerals mainly because it is formed during
A.
Photosynthesis
B.
Radioactive decay
C.
Electrolysis
D.
Neutralisation
Correct Answer:
Radioactive decay
Explanation:
Naturally occurring polonium is produced as an intermediate product in radioactive decay series associated with uranium minerals.
4. Which statement correctly describes the natural occurrence of polonium?
A.
It is widely distributed in large quantities.
B.
It occurs in trace amounts in uranium ores.
C.
It is the main constituent of seawater.
D.
It is found abundantly in atmospheric oxygen.
Correct Answer:
It occurs in trace amounts in uranium ores.
Explanation:
Polonium is a rare element that occurs in very small quantities in uranium ores.
5. Polonium is difficult to find in large quantities in nature because it is
A.
Nonradioactive and chemically inert
B.
Radioactive and present only in trace amounts
C.
A major component of common rocks
D.
Highly abundant in living organisms
Correct Answer:
Radioactive and present only in trace amounts
Explanation:
Polonium occurs only in trace amounts and undergoes radioactive decay, so it is not found abundantly in nature.
6. In nature, polonium is most closely associated with the radioactive decay series of
A.
Uranium
B.
Sodium
C.
Aluminium
D.
Magnesium
Correct Answer:
Uranium
Explanation:
Polonium appears as a radioactive decay product in the uranium decay series and is therefore found in uranium ores.
7. Which mineral source is most likely to contain naturally occurring polonium?
A.
A uranium-bearing mineral
B.
A pure quartz deposit
C.
A sodium carbonate deposit
D.
A calcium phosphate deposit
Correct Answer:
A uranium-bearing mineral
Explanation:
Natural polonium is associated with uranium-bearing minerals because it forms during the radioactive decay of uranium.
8. The occurrence of polonium in uranium ores is an example of an element being present as a
A.
Major structural component
B.
Trace radioactive product
C.
Stable atmospheric gas
D.
Common dissolved salt
Correct Answer:
Trace radioactive product
Explanation:
Polonium is found only in trace amounts in uranium ores and is produced through radioactive decay.
9. Why is polonium considered a rare naturally occurring element?
A.
It is found only in trace amounts and is radioactive.
B.
It forms most of the Earth's crust.
C.
It is the main element in seawater.
D.
It occurs abundantly in common soil minerals.
Correct Answer:
It is found only in trace amounts and is radioactive.
Explanation:
Polonium is rare because its natural occurrence is limited to trace amounts in radioactive minerals, especially uranium ores.
10. Natural polonium is generally obtained from materials containing
A.
Uranium and its decay products
B.
Only sodium and potassium salts
C.
Pure carbon deposits
D.
Only calcium and magnesium minerals
Correct Answer:
Uranium and its decay products
Explanation:
Polonium occurs naturally in uranium-containing materials as one of the products formed in radioactive decay.
Short questions are currently unavailable for this page.