Question

When 2 to 3 drops of Benedicts reagent are added to a urine sample and heated gently, it turns yellow. This colour change indicates that

• A. Urine contains 2% glucose
• B. Urine contains 0.5% glucose
• C. Urine contains 1.5% glucose
• D. Urine contains 1% glucose

Answer 1

The correct option is D Urine contains 1% glucose

The color of the solution after performing the Benedict's test represent the amount of glucose present in the given solution. If the solution turns green, it indicates presence of 0.1 to 0.5 % glucose.

If the solution turns yellow, it indicates presence of 0.5 to 1% glucose.

If the solution turns orange, it indicates presence of 1 to 1.5% glucose.

If the solution turns red, it indicates presence of 1.5 to 2% glucose.

If the solution has more than 2% of glucose then the solution shows brick red precipitate.

So as the yellow color can show a maximum of 1% glucose the correct option is D.