A) 693.0 सेकंड
B) 238.6 सेकंड
C) 138.6 सेकंड
D) 346.5 सेकंड
सही उत्तर: C
( {{t} _{1/2}}=\frac{0.693}{{10^{-2}}} ) सेकंड 20 g अभिकारक को 5 g तक घटने के लिए दो ( {{t} _{1/2}} ) आवश्यक हैं।
( \therefore ) ( t=2\times \frac{0.693}{{10^{-2}}},सेकंड ) ( =138.6,सेकंड )
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