OnlineCBT
Chemistry · Some Basic Concepts of Chemistry
हिन्दीCalculate the result of the following operation expressed to the appropriate number of significant figures: \[(2.5 \times 10^{-2}) - (4.8 \times 10^{-3})\]
Correct answer · Option B
\( 2.0 \times 10^{-2} \)
Explanation
\( 2.5 \times 10^{-2} - 0.48 \times 10^{-2} = (2.5 - 0.48) \times 10^{-2} = 2.02 \times 10^{-2} \). Since \( 2.5 \) has one decimal place, the result must be rounded to one decimal place, giving \( 2.0 \times 10^{-2} \).
