Exercise: Chemistry

Questions for: Chemistry

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A:
3 billion years
B:
100 years
C:
0.01 minute
D:
13 days
Answer: C
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The method that cannot be used for removing permanent hardness of water is
A:
adding sodium carbonate
B:
distillation
C:
adding caustic soda
D:
boiling
Answer: D
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The most electropositive elements among the following is
A:
Na
B:
Ca
C:
K
D:
Cs
Answer: D
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The hydronium ion is
A:
H+
B:
HO -
C:
H2+
D:
H3O+
Answer: D
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The first metal used by man was
A:
iron
B:
copper
C:
gold
D:
bronze
Answer: B
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