Question

Colour of FeO is:
A. Black
B. Blue
C. Green
D. Red

Answer 1

Hint: In nature all metals are not going to be available in their pure form. Most of the metals are going to be available in the form of their oxide derivatives due to the high reactivity of the metals towards the oxygen.

Complete answer:
- In the question it is asked to write the colour of the FeO.
- FeO is called iron oxide.
- In iron oxide (FeO) iron has an oxidation state of ‘+2’.
- So, we can write FeO as Iron (II) oxide.
- Iron oxide is an inorganic compound.
- We know that iron oxide is going to be available in nature in the form of Wustite.
- The color which is exhibited by the iron oxide (FeO) is black color.
- Iron oxide at room temperature is going to exist in powder form.

So, the correct option is A.

Additional information:
- Iron oxide is going to be used in cosmetics too.
- Black iron oxide is also called magnetite.
- Iron oxide is going to be used as corrosion resistance.
- To shorten the proton relaxation time in MRI iron oxide is going to be used.

Note:
Iron oxide is a safe chemical that is non-toxic in nature and going to be used in personal care objects. When water is going to react with iron oxide then the color is going to change to a greenish color and FDA approved iron oxide can be used in cosmetics.