1. Which isotope is the most abundant naturally occurring isotope of sulfur?
A.
32S
B.
33S
C.
34S
D.
36S
Correct Answer:
32S
Explanation:
Sulfur-32 (32S) is the most abundant sulfur isotope, making up approximately 95% of natural sulfur.
2. What is the approximate natural abundance of 32S in sulfur?
A.
0.02%
B.
0.75%
C.
4.21%
D.
95.02%
Correct Answer:
95.02%
Explanation:
The isotope 32S constitutes about 95.02% of naturally occurring sulfur.
3. Which sulfur isotope has an approximate natural abundance of 4.21%?
A.
32S
B.
33S
C.
34S
D.
36S
Correct Answer:
34S
Explanation:
Sulfur-34 (34S) occurs naturally at an approximate abundance of 4.21%.
4. Which naturally occurring sulfur isotope is present in the smallest proportion?
A.
32S
B.
33S
C.
34S
D.
36S
Correct Answer:
36S
Explanation:
Sulfur-36 (36S) is the least abundant of the commonly listed natural sulfur isotopes, occurring at about 0.02%.
5. What is the approximate natural abundance of 33S?
A.
0.02%
B.
0.75%
C.
4.21%
D.
95.02%
Correct Answer:
0.75%
Explanation:
Sulfur-33 (33S) has an approximate natural abundance of 0.75%.
6. Which sequence correctly arranges the common sulfur isotopes in decreasing order of natural abundance?
A.
32S > 34S > 33S > 36S
B.
34S > 32S > 36S > 33S
C.
33S > 36S > 34S > 32S
D.
36S > 33S > 34S > 32S
Correct Answer:
32S > 34S > 33S > 36S
Explanation:
The approximate abundances are 95.02% for 32S, 4.21% for 34S, 0.75% for 33S, and 0.02% for 36S.
7. Which sulfur isotope contributes approximately 95% of natural sulfur?
A.
33S
B.
34S
C.
36S
D.
32S
Correct Answer:
32S
Explanation:
Sulfur-32 is responsible for approximately 95% of the natural isotopic composition of sulfur.
8. Which pair represents the two least abundant common sulfur isotopes in nature?
A.
32S and 34S
B.
32S and 33S
C.
33S and 36S
D.
34S and 36S
Correct Answer:
33S and 36S
Explanation:
Among the common sulfur isotopes, 33S has about 0.75% abundance and 36S about 0.02%, making them the two least abundant.
9. The natural isotopic abundance of 34S is closest to which value?
A.
0.02%
B.
0.75%
C.
4.21%
D.
95.02%
Correct Answer:
4.21%
Explanation:
Sulfur-34 (34S) has a natural abundance of approximately 4.21%.
10. Which sulfur isotope has a natural abundance of approximately 0.02%?
A.
32S
B.
33S
C.
34S
D.
36S
Correct Answer:
36S
Explanation:
Sulfur-36 (36S) is found in nature at an approximate abundance of 0.02%.
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