Priya's mother uses iodised salt at home. One day while cooking,Priya asked her mother about iodised salt. She said people who do not use iodised salt suffer from deficiency of iodine which leads to goitre and hypothyroidism.
$(a)$ What are the physical symptoms of goitre and hypothyroidism?
$(b)$ How will you inform others about the importance of iodised salt?
$(c)$ Is iodine a metal or a non-metal?
$(d)$ What are the physical properties of iodine?
$(e)$ What is the difference between iodised salt and normal salt?

(N/A) The physical symptoms of goitre and hypothyroidism are as follows:
$(i)$ During hypothyroidism,the metabolic rate of the body decreases.
$(ii)$ Increased sleep and lethargy are observed along with increased body weight.
$(iii)$ Swelling of the neck (goitre) and sometimes swelling of the legs is observed.
$(iv)$ During goitre,the thyroid gland enlarges significantly.
$(b)$ Others can be informed about the importance of iodised salt through posters,banners,or by organizing small awareness programs in the locality.
$(c)$ Iodine is a non-metal with the symbol $I$.
$(d)$ Iodine is a non-metal that appears as a metallic grey solid and turns into a violet gas upon heating. It has a boiling point of about $457.4 \ K$ and a density of about $4.933 \ g/cm^3$. Iodine undergoes sublimation when heated.
$(e)$ There is no significant difference in the chemical structure of the base salt. The main difference is that normal salt is primarily $NaCl$,whereas iodised salt has a small amount of iodine compounds (like potassium iodide) added to $NaCl$,which is an essential micronutrient. This is necessary because iodine levels are low in many soils worldwide,leading to a deficiency in crops and subsequently in humans,causing goitre.