Question

Among the elements listed, which one could replace all the rest as an ion from a compound in aqueous solution?
A) Ag
B) Fe
C) Ca
D) Cu​

Answer 1

Answer : The correct option is, (C) Ca

Explanation :

Single replacement reaction : A chemical reaction in which the more reactive element replace the less reactive element.

It is represented as,

$A+BC\rightarrow AC+B$

In this reaction, A is more reactive element and B is less reactive element.

Reactivity series : It is used to determine the products of the single displacement reactions. As we know that in a single displacement reaction, the most reactive metal displaces the least reactive metal.

From the given reactivity series we conclude that,

Calcium (Ca) metal is more reactive metal than all the rest metals (Ag, Fe, Cu). So, Ca metal can displaces all the rest metals from its solution.

Hence, the correct option is, (C) Ca

Answer 2

The element that could replace the rest in the options would be Ca.

According to the electrochemical reactivity series (see the attached image), Ca occupies the topmost position of all the elements in the list.

This means that Ca is the most reactive of all the elements and will, hence, displace the rest of the ions of the element from a compound in an aqueous solution.

More on the electrochemical series can be found here; https://brainly.com/question/14652325?referrer=searchResults