When the original value of N in urea is 46% and the estimated value is 45.5%, then the relative error is ___ %.

Correct option is B

Explanation of the Correct Option (b): 1.068%
· Relative error (%) is calculated using the formula:

Explanation of Other Options
Option (a): 0.5
· Incorrect because:
· This is the absolute error, not relative error.
Option (c): 0.005
· Incorrect:
· Value is too small and not expressed as percentage.
Option (d): 0.1068
· Incorrect:
· Decimal form, not percentage.
Key Points Related to the Question
· Absolute error ≠ Relative error
· Relative error is expressed as percentage
· Commonly used in analytical chemistry and fertilizer analysis
· Important for quality control of fertilizers