This symbol ⇔ indicates: question 2 options: that heat must be applied. that the reaction is reversible. that a gas is formed by the reaction. an incomplete combustion reaction.

Answer : The correct option is, the reaction is reversible.

Explanation :

Reversible reaction : It is defined as the chemical reaction in which the reactants react together to give products and in turn, react together to give the reactants back.

When the concentration of reactants and products are equal that means the reaction reach at equilibrium point and the reaction will be reversible.

The symbol of reversible reaction is, or ⇔

From the given options we conclude that, given symbol indicates the reaction is reversible.

Hence, the correct option is, the reaction is reversible.

it's all four options.