Which of the following steps can be used to identify a single replacement reaction a) check whether the products are salt and water. b) check whether the reactants are an acid and a base. c) check if the irons of two compounds exchange places. d) check if one element replaces another element in a compound.

Option D :- check if one element replaces another element in a compound.

Explanation:

A single-displacement reaction occurs when an element replaces another element in a compound. A metal only replaces a metal, and a nonmetal only replaces a nonmetal.

 D) check if one element replaces another element in a compound.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A double displacement reaction is one in which exchange of ions take place.

A neutralization is a chemical reaction in which an acid reacts with the bas to form salt and water.

A) check whether the products are salt and water- neutralization

B) check whether the reactants are an acid and a base: neutralization

C) check if the irons of two compounds exchange places: Double displacement

D) check if one element replaces another element in a compound: single replacement

a electronegativity decreases beacuse the size of nucleus is bigger.