Question

Mottling of teeth is due to the presence of an element in drinking water
(a)Mercury
(b)Fluorine
(c)Boron
(d)Chlorine

Answer 1

Hint: They are an element characterized as halogen within the table with number 9 and symbol F. This element is a poisonous gas. It remains within the air for a long time when attached to tiny particles.

Complete answer:
Fluorides are given out during the refining of materials. Fluorides cause fluorosis. It's a disease, which is defined by mottling of teeth, abnormal bones, which are susceptible to fracture because fluoride replaces calcium and makes the bones brittle. Fluoride pollution is a significant issue in many nations of India, where the surplus of fluoride in water adversely affects the health of man.

Additional Information: Inorganic mercury is the commonest form that's present in drinking water but isn't considered to be very harmful to human health, in terms of the amount found in drinking water.
The most common chlorine, by far. Chlorine kills many organisms which will cause ailments and diseases. There's a little chance of dangerous outbreaks like dysentery, by adding chlorine to the water system.
Boron can enter your body once you eat food (fruit and vegetables), drink water containing it, once you breathe borate dust within the air, and when damaged skin comes in touch with it. Public health turbidity requirements lead in most cases to transparent, attractive water. High concentrations of dissolved solids, though safe, produce water with a rather alkaline taste.
So, the correct answer is 'Fluorine'.

Note: The element Fluorine is a poisonous gas. Fluorine gas is a powerful irritant towards the eyes, skin, and lungs. The element has been recorded around 50 ppb in city environments. Fluorine exists naturally within the earth’s crust and is located in coal, clay, and rocks. They might be used to map the cardiovascular system and any disorders.