Which of the following statements about double displacement reactions is correct?

Correct option is A

Double displacement reactions:

·        ​A type of chemical reaction known as a double displacement reaction occurs when the reactant ions swap positions to produce new products.

·        Precipitation is typically the result of a double displacement reaction.

·        Covalent or ionic chemical bonds may exist between the reactants.

·        Double replacement, salt metathesis, and double decomposition are all variations of the double displacement reaction. Example: A double displacement reaction occurs when sodium chloride and silver nitrate react.

·        The sodium acquires the nitrate anion as a result of the silver trading its nitrite ion for the chloride ion of the sodium.

·        AgNO₃ + NaCl → AgCl + NaNO₃.

Types of Double Displacement Reactions:

Precipitation reaction:

•  A new insoluble ionic compound is produced when two aqueous ionic compounds undergo a precipitation reaction.
• Here is an illustration of how lead(II) nitrate and potassium iodide react to make lead iodide (insoluble) and potassium nitrate (soluble).
• Pb(NO3)2(aq) + 2 KI(aq) → 2 KNO₃(aq) + PbI₂(s) The precipitate of lead iodide is referred to as the supernate or supernatant, while the solvent (water) and soluble reactants and products are referred to as the precipitate.
•   As the product leaves the solution, the formation of a precipitate propels the reaction forward.

Neutralization reactions:

• Double displacement reactions between acids and bases are neutralization reactions.
•  A salt is typically the result of a neutralization reaction when water is the solvent.
•  If at least one of the reactants is a strong acid or a strong base, this kind of reaction moves in the right direction.
•  A neutralization reaction is an illustration of what happens when vinegar and baking soda react in the traditional baking soda volcano.
•  The fizz that results from this particular reaction is caused by the release of a gas, carbon dioxide.
•  The initial reaction of neutralization is: NaHCO₃ + CH₃COOH(aq) → H₂CO₃ + NaCH₃COO