Question

The sign that indicates reversible reaction is ____ .
(A) $ \to $
(B) $ \rightleftarrows $
(C) $ \leftarrow $
(D) $ = $

Answer 1

Hint :In the given question firstly we have to define what exactly the reversible reactions are. Then we have to give a proper example to showcast the reaction like $ {H_2}C{O_{3{\text{ }}(l)}}\; + {\text{ }}{H_2}{O_{(l)}}\; \rightleftharpoons {\text{ }}HC{O_3}{^ - _{(aq)}}\; + {\text{ }}{H_3}{O^ + }_{(aq)}. $ Now after that we get the correct arrow representing the process

Complete Step By Step Answer:
The given question statement asks about the kind of arrow through which we would be able to get and explain the proper and correct explanation of all the steps involved in the reaction. So we have to explain what exactly are the reversible reactions and the correct answer of the problem.
The reversible reaction is a type of reaction in which there is the conversion of reactants into the products and the subsequent conversion of the products into the reactants occurring simultaneously.
For example we get the reaction of :
 $ {H_2}C{O_{3{\text{ }}(l)}}\; + {\text{ }}{H_2}{O_{(l)}}\; \rightleftharpoons {\text{ }}HC{O_3}{^ - _{(aq)}}\; + {\text{ }}{H_3}{O^ + }_{(aq)}. $
In a sense we can say that a truly and basic kind of irreversible chemical reaction is the one that is usually achieved whenever one of the given products exits from the reacting system.
For a example, in the reaction where carbon dioxide (volatile) does in the reaction given below:
 $ CaC{O_3}\; + {\text{ }}2HCl{\text{ }} \to {\text{ }}CaC{l_2}\; + {\text{ }}{H_2}O{\text{ }} + {\text{ }}C{O_2} \uparrow $
Therefore we can say that the correct answer for the given problem would be option B, $ \rightleftarrows $ .

Note :
The main concept of the reversible reaction was said to be introduced by a man called Berthollet in 1803. Uptil then it was considered that chemical reactions were thought to always proceed in a particular direction. Berthollet reasoned that the excess of salt in the lake helped push the "reverse" reaction towards the formation of sodium carbonate.