Question

Match the following:
 

• A. \( A - III, B - II, C - I \)
• B. \( A - III, B - I, C - II \)
• C. \( A - II, B - I, C - III \)
• D. \( A - II, B - III, C - I \)

Hint:

Fluoride is beneficial in small amounts but harmful in excess. Below 1 ppm causes tooth decay, 2-10 ppm causes dental fluorosis, and above 10 ppm leads to skeletal fluorosis.

Answer 1

The Correct Option is D

Solution:

The given problem is to match elements to their corresponding categories correctly based on the provided options. We need to identify the suitable pairs from:

• \( A - II, B - III, C - I \)
• \( A - III, B - II, C - I \)
• \( A - III, B - I, C - II \)
• \( A - II, B - I, C - III \)

Based on the information provided, the correct match is \( A - II, B - III, C - I \). This indicates that:

• The element or compound labeled as A corresponds to category II.
• The element or compound labeled as B corresponds to category III.
• The element or compound labeled as C corresponds to category I.

To validate the solution, closely examine the properties or specifics of each element, ensuring logical matching to each numbered category in accordance with standard chemical classifications or characteristics.

Answer 2

The correct matching is: 

• A - II: A fluoride concentration of less than 1 ppm in drinking water helps prevent tooth decay.
• B - III: A fluoride concentration greater than 2 ppm can cause brown mottling of teeth (fluorosis).
• C - I: A fluoride concentration greater than 10 ppm can be harmful to bones, causing skeletal fluorosis.

Therefore, the correct answer is: A - II, B - III, C - I.