JAMB 2025 Chemistry · Question 60
A table in which metals are arranged in series according to their comparative tendencies to give up their valence electrons is
Options
- A.periodic table
- B.electrochemical series
- C.table of elements
- D.periodicals
Answer: B. electrochemical series
Explanation written with AI and checked against the answer key
Analysis of the Question
The question asks for the name of the specific arrangement where metals are listed based on their ability to lose electrons (oxidation) or their reactivity.
Concept Explanation
In chemistry, the Electrochemical Series (also known as the Activity Series) is a list of elements arranged in order of their standard electrode potentials.
- How it works: Metals at the top of the series have a high tendency to lose electrons (they are strong reducing agents and are highly reactive). Metals at the bottom have a lower tendency to lose electrons.
- Why it matters: This series helps us predict whether a metal will displace another from a solution of its salt or react with water/acids. For example, Zinc is higher than Copper in the series, which is why Zinc can displace Copper from a Copper(II) tetraoxosulphate(VI) solution.
Step-by-Step Solution
- Evaluate Option A (Periodic Table): The periodic table arranges elements based on their atomic numbers and electronic configurations, not specifically by their tendency to lose electrons in electrochemical reactions.
- Evaluate Option B (Electrochemical Series): This is the standard scientific term for the arrangement of metals based on their comparative tendencies to give up valence electrons (their oxidation potential).
- Evaluate Option C (Table of Elements): This is a generic term and does not specifically refer to the electrochemical arrangement.
- Evaluate Option D (Periodicals): This refers to magazines or journals published at regular intervals; it has no relevance to chemistry.
Comparing these, the Electrochemical Series is the correct scientific term for the description provided in the question.
Exam Tip
Think of the Electrochemical Series as a "Power Ranking" for metals. The higher the metal is on the list, the more "eager" it is to get rid of its electrons to become an ion. Remember the mnemonic "Please Stop Calling Me A Careless Zebra Instead Try Learning How Copper Saves Gold" (Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Tin, Lead, Hydrogen, Copper, Silver, Gold).
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