Question

The correct order of increasing chemical reactivity of the following metals is:

• A. Zn \(<\) Fe \(<\) Mg \(<\) K
• B. Fe \(<\) Mg \(<\) Zn \(<\) K
• C. Fe \(<\) Mg \(<\) K \(<\) Zn
• D. Fe \(<\) Zn \(<\) Mg \(<\) K

Hint:

Always remember: textbfReactivity increases as we move up the reactivity series. Potassium is one of the most reactive metals, while iron and zinc are much less reactive.

Answer 1

The Correct Option is D

Step 1: Recall the metal reactivity series. The reactivity series of metals (from most reactive to least reactive) is: \[ \text{K}>\text{Na}>\text{Ca}>\text{Mg}>\text{Al}>\text{Zn}>\text{Fe}>\text{Pb}>\cdots \] Step 2: Identify the given metals in the series.

Potassium (K) — most reactive
Magnesium (Mg) — highly reactive
Zinc (Zn) — moderately reactive
Iron (Fe) — less reactive
Step 3: Arrange them in increasing order of reactivity (least to most). \[ \text{Fe}<\text{Zn}<\text{Mg}<\text{K} \] Step 4: Match with the given options. This order corresponds to option (D). \[ \boxed{\text{(D)}} \]