Question

Which of the following represents the smallest quantity ?

• A. 1230 ng
• B. $1.230\times {10}^{-4}g$
• C. $1.230\times {10}^{-6}kg$
• D. $1.230\times {10}^4\mu g$

Answer 1

The correct option is A 1230 ng

(a) $1230ng=1230\times {10}^{-9}g=1.230\times {10}^{-6}g$.
(b) $1.230\times {10}^{-4}g=1.230\times {10}^{-4}g$.
(c) $1.230\times {10}^{-6}kg=1.230\times {10}^{-6}\times {10}^{3}g$
$=1.230\times {10}^{-3}g$
(d) $1.230\times {10}^4\mu g=1.230\times {10}^4\times {10}^{-6}g$
$=1.230\times {10}^{-2}g$
Thus, 1230 ng is the smallest quantity.