Question

The salt we use in our food is
(A) $NaCl\;$
(B) $CaCl_2$
(C) $KCl\;$
(D) $MgCl_2$

Answer 1

Hint : From the given options, we can understand that the following compounds can be formed by the neutralization reaction of hydroxides of $s$ block elements that act as a strong base and hydrogen chloride that acts as a strong acid, and thus all these resultant compounds act as a neutral salt. The salt which is easily available, cheap, safe, and adds good taste to our food is used in our food.

Complete Step By Step Answer:
The human body contains the elements $Na^+$ , $K^+$ , $Ca^{+2}$ , $Mg^{+2}$ which are used as nutrients for the proper functioning of all systems.
Hence, as this is required by the body, we need to consume these ions, or say food that contains these ions.
The ions are required in the body in a definite proportion, and their deficiency as well as excess can cause diseases or malfunctioning of the human body.
Now, calcium can be obtained in the required amount from the dairy products, leafy vegetables, fruits etc. Also, the salt of calcium i.e. Calcium chloride is safe to consume but bitter in taste, which spoils the food taste.
Also, magnesium can be obtained in the required amount from fruits, dry fruits, fish, grains etc. Also even though the salt of magnesium i.e. Magnesium chloride is easily available, and safe to consume in limit, it mostly spoils the taste of food.
Hence, magnesium chloride and calcium chloride are not usually used as salt in our food, as they can be obtained from various other sources.
Our body possesses a Sodium-Potassium pump which regulates the amount of sodium and potassium in our body, and whose efficient working is very important for our body. For this pump to work efficiently, we need more sodium and less potassium.
Potassium can be obtained in the required amount from fruits like apricots, bananas etc. , beef, green vegetables etc. Also the salt of potassium i.e. Potassium chloride is a little expensive and bitter in taste.
While we get other nutrients from various sources, the best and the cheapest, safest and one of the major sources to obtain sodium is Rock salt or Sodium chloride, which is obtained by the evaporation of seawater, adds taste to the food, and is easy to obtain.
Hence, from the given options, Sodium Chloride or rock salt is the best salt to be used in the food we eat.
Hence, the correct answer is Option $(A)$ .

Note :
Here, we learned that the salt $NaCl\;$ is used in our food. In fact, all the above given salts can be used in our food as our body requires all the nutrients. But the salts $KCl\;$ , $CaCl_2$ , and $MgCl_2$ are proven to be toxic when taken in more proportion. Hence, the other salts are taken in the body, only when there is a deficiency in the body or excess of sodium in the body with food or other methods.