Question

Which metal has a greater tendency to form metal oxide?
A. Cr
B. Fe
C. Al
D. Ca

Answer 1

Hint: To solve this problem, you need to know about the reactivity series. So, the reactivity series is the arrangement of metals in the descending order of their reactivity. We get many information like reactivity of metals towards water and acids using this series.

Complete step by step answer:
We know that the information about the reactivity series of metal is important for solving this problem. So, the reactivity order of metals is as follows:
K > Na > Ca > Mg > Zn > Fe > Pb > Cu > Ag

From this reactivity series, it is clear that the potassium is highly reactive metal among these metals. Potassium and sodium will react vigorously with cold water while calcium readily reacts with cold water. By following the trend, magnesium reacts very slowly with cold water. All the other metals will not react with cold water but react with steam when the metals are heated. Sodium, potassium and calcium will react with steam and they form metal oxides easily due to the effect of temperature on the reaction. Among these, calcium has the greater tendency to form metal oxides.

So, the correct option is (d).

Note: You should know that the oxides are the binary compounds formed by reaction of an element with oxygen. The oxides of metals are basic in nature while the oxides of non-metals are acidic in nature.